Over the past several years, I’ve slowly constructed a spreadsheet to meet all of my home theater design needs. I noticed on various forums that others could probably benefit from this spreadsheet, so I cleaned it up and I’m now making it available to the public. Please download it and put it to good use!

The spreadsheet contains calculations for the following:

  • recommended viewing distances for a given screen size – for both flat panels and projectors (based on THX and SMPTE standards)
  • recommended viewing distances for a given display resolution – 480p, 720p, 1080p/1080i, 1440p, etc (based on Visual Acuity standards)
  • various screen aspect ratios (4:3, 16:9, 1.85:1, 2.35:1, custom ratios, etc.)
  • projector screen size & screen brightness with guidelines for recommended values (based on projector brightness and screen gain)
  • projector screen size & projector mounting location (based on min/max projector throw distances)
  • seat locations, a second row stadium seating platform height calculation, and a few other goodies.

Microsoft Excel Icon theater_calculator_v4.1.xlsx

Please report any problems or suggestions via e-mail or the comments form below.

Revision history:

  • Version 4.1: Added details on how to enter 4k and 8k UHD resolutions.
  • Version 4.0: Added Anamorphic (horizontal expansion) front projector lens option, which adjusts projector brightness and throw ratios when selected.
  • Version 3.7: Clarified back row platform height input fields, modified formulas to prevent negative platform heights (user info message instead), changed spreadsheet defaults to better fit a typical home theater.
  • Version 3.6: Added feature to allow calculation of Visual Acuity Viewing Distance based on eyesight of the viewer. The default is 20/20 vision; changing the input to 20/10 vision with show that the viewer will be able to spot resolution deficiencies at much greater distances due to more acute eyesight.
  • Version 3.5: Fixed bug in the aspect ratio input that caused international users to have problems (problem was related to using “,” as decimal delimiter instead of “.”) Added cells to the far right of the spreadsheet to allow changing and adding custom screen aspect ratios.
  • Version 3.4: Widened columns that were causing being truncated for international users.
  • Version 3.3: Added 2.35:1 aspect ratio back.
  • Version 3.2: Changed anamorphic aspect ratio from 2.35:1 to 2.370370:1, which is the correct value for a 16:9 projector with a 4:3 anamorphic lens. Corrected spelling mistakes on one of the extra tabs within the spreadsheet.
  • Version 3.1: Fixed unit conversion formula that was causing “Second Row Field-of-View Width” to not calculate when any unit besides “inches” was selected.
  • Version 3.0: Added minimum viewing distance calculation, added conditional feedback on seating distance for each specification (seating distance too far, etc.), added first row and second row seating distances (for conditional feedback on seating distances), added field-of-view results (in degrees), added ability to calculate projector throw distances for any screen size (just enter the throw information for one screen and it will interpolate for other screen sizes), fixed mis-spelling that was causing formulas to break.
  • Version 2.9: Added 2.40:1, 2.70:1 screen aspect ratios, added ‘hover’ comments to better explain the different seating distances; added conditional formatting on the screen brightness result cell (red if brightness is too low, yellow if it is close to being too low).
  • Version 2.8: Added charts for “seating distance vs. screen size based on screen resolution” and “seating distance vs. screen size based on published standards.”
  • Version 2.7: Edited notes fields to improve clarity for data entry fields.
  • Version 2.6: Added LCD/Plasma support. Added 16:10 aspect ratios for LCD monitors. Added hints to help enter panel resolutions (hint lists commons resolutions). Added pixel density calculation (useful when using as a PC monitor). Added dot pitch (in mm – millimeters). Added total pixel count. Fixed spelling errors.
  • Version 2.5: Updated screen brightness calculation to adapt to entering screen width vs. height vs. diagonal measurement. Thanks Brad for finding the problem.
  • Version 2.4 – 01-Nov-2004: First Public Release. Uses both metric and English units. Converts between many units. Gives hints for some common input values such as aspect ratio. Seating distance. Platform height. Viewing angle. Screen brightness. Many other features.


If the spreadsheet is too complicated for you…

If you don’t like working with spreadsheets, enter your screen size below to see how close you’ll need to sit to fully appreciate various screen resolutions.

Enter screen size: inches diagonal

  • For 480p (720×480) resolution, you must sit:
    feet or closer to see all available detail
  • For 720p (1280×720) resolution, you must sit:
    feet or closer to see all available detail
  • For 1080p (1920×1080) resolution, you must sit: (recommended minimum distance)
    feet or closer to see all available detail
  • For 4k (3840×2160) resolution, you must sit:
    feet or closer to see all available detail
  • For 8k (7680×4320) resolution, you must sit:
    feet or closer to see all available detail

Note about “or closer” viewing distances calculated above: if you sit closer than the distances shown above, you will be able to see some (but not all) of the detail offered by the next higher resolution.


    1. Hello, I am planning for 5.1.2 (Dolby Atmos)home theatre setup with 50″ 4k UHD setup. With in 3days, Will start the construction for the Hall room first, I have the free space around 200sqft. Now please guide me what will be the perfect room size for this 5.1.2 (Dolby Atmos)home theatre setup with 50″ 4k UHD setup. According to that I will start the construction. Also please guide me the speakers setup measurements.
      Thanks in advance.

        1. I recommend reading Get Better Sound by Jim Smith. He will tell you there is a perfect room size and provide the math as to why.

          1. Author

            Scott, the room ratio to which you are referring is known as the Golden Cuboid. It’s supposed to provide the most even audio distribution. The ratios are 1.0:1.6:2:6

            So if the ceiling height is 10’, the golden cuboid dimensions would be 16 feet wide and 26 feet long.

            If you have a completely in constrained floor plan, these room dimension ratios are a great starting place. But I don’t feel they are absolutely essential to achieve great sound quality.

  1. I have a media room size of 20ft * 14ft but my projector can be placed at 12ft since there is a beam in the middle. I need 135 inch screen size .Can you tell me which project i could purchase for less than 1300$

    1. Hi Manish, there are plenty options for 1080P projectors around 1300$ price range , but if you can spend a little more you can get the latest Benq 2550 4k , its not the best but certainly one of the best 4k in the that price range. I would recommened you to search on AVSForums you would get plenty of information. For a long time i am fan of BenQ projectors for their excellent picture quality .

      1. I have a room that is 12 ft wide and 20 ft long that I hope to convert into a media room. Although I hear that the minimum width should be 15 ft. Do you recommend a TV or Projection screen for a room this size?

        1. Author

          Hi Jay, There is no reason you can’t use a projector and screen in a room that’s 12 feet wide, but there are additional considerations.

          First of all, you need to have complete light control for a projector to be a better option than a direct-view TV. I’m assuming this is the case for you.

          The second issue is screen width, which is getting pretty close to room width. A 130-inch screen is 11-feet wide and the boarder around the screen would make it about 12 feet wide. That’s the biggest screen I would recommend anyway, but you’re probably better off with a 120-inch screen, which will give about 8-inches of space from the edge of the screen frame to the wall.

          This brings up the final consideration: front speakers. If you want floor standing speakers, you won’t be able to fit them to either side and you won’t want them blocking the screen. So you have 2 options. The best one is to get an acoustically transient screen and mount speakers behind the screen – this gives the most flexibility for placement. The other option is to get an even smaller screen (110-inches or 100-inches diagonal) to give enough room for speakers on either side. (Note: you don’t want your left/right speakers directly against the side walls – you ideally will have some space around them.)

          But there’s nothing wrong with a big direct-view TV either.

          Good luck and enjoy!

  2. At what height home theater screen should be fixed from floor.?

  3. Why do American’s insist on Inch’s when sizing – it’s so illogical and hard to calculate with.

    1. Author

      It’s because that’s the way TVs are sold in the US, and the US is a big enough market that there is no way to force conformity to external standards. As you may have noticed, the inputs and outputs on the spreadsheet have configurable units…including metric.

  4. Firstly, thanks for tackling a complicated subject in such a thorough manner! Great presentation, too. My question: I just bought an LG 55″ OLED 4K 3D TV (LG OLED55E6P). Would I still use the “3 ft or closer for 4K” as recommended by the chart, i.e., would the OLED and/or 3D make any difference? (And while 3 ft would be awesome in the theater room on your website, I’m having a hard time imagining it in a living room which is considerably larger and oddly-shaped. Any thoughts or should I confer with an interior designer on that one?…lol). Thank you!

    1. Author

      I think you’re ask the wrong question. You’ll have huge benefits from OLED in terms of black level, contrast ratio, color accuracy, and all other aspects of picture quality. It’s awesome hardware. For the resolution aspect specifically, you may not be able to perceive ever possible detail of a 4k image, but that’s not what’s most important for picture quality. There’s nothing wrong with the setup you have. Unless you want to spend more and have space for a bigger screen, you’re setup is probably ideal for your situation.

      1. Taking this a step futher, I have the same TV as above. Is there a gradient for resolving 4K detail between 3’ and 7’. Or it it a binary choice. Let’s say you sit 5’ away with a 55” inch screen. Would it be reasonable to say that you can resolve some, but not all of the detail or does it all come into focus at 3’ and anything less is 1080p. You have heard the saying, half a loaf is better than none”. How does that apply to your calculator? Although your calculator is widely used and respected, there have a been a few comparisons where a group of viewers, doing an A/B comparison claimed to see a difference between 1080p and 4k, even at 7 or 8 feet. Ie, they all picked the 4K screen as the one w/more detail.

        Off topic here, but the marketing of the 4K Apple TV as 4KHDR is now conflating two different concepts and implying that 4K is delivering more value than it actually is – 4K is now the Trojan Horse containing the HDR payload.

        1. I think a better way to think about it is if you are sitting beyond the maximum for resolving 4k detail, then you may as well have had 1080p (you are paying for 4k but getting no benefit).

        2. Author

          Yes, there is a gradient for resolving resolution detail and you can get some of the benefit at “almost 1080p” distances. In fact, you can get all of the benefit in some situations, such as geometric and high-contrast test scenes. The spreadsheet assumes a “worst case” of wanting full resolution benefit on scenes that are not high contrast. The graph in this post explains it pretty well: https://carltonbale.com/does-4k-resolution-matter/

          You’re absolutely correct on “4kHDR”. The picture looks incredible, but in most cases the gain is because of the “better pixels” from HDR rather than the “more pixels” from 4k.

  5. excel download is not working for older excel versions. make it compatible please.

  6. So I am building walls in my 19′ long by 17′ wide movie theater room. Ive read lots of blogs about setups, but I cant find anything on what the best system is for my room. Should I go 5.1.2, 7.1.2 or 7.1.4 in a 3 rows of seating theater? the Atmos speakers will be mounted in ceiling. Also what is a great speaker set, receiver and projector all within about $5-$7,000 total? thanks love your page

  7. Hi Carlton, First thank you very much for helping us.

    I have a room 23′ X 19′ , I am planing to put 150 inch screen on 23′ wall and viewing distance is 19 feet and adding 2 rows.

    is that enough distance to watch 150 inch screen from 13 to 19 feet distance? is something I am doing wrong.

    can you please suggest right projectors?

    Thanks in advance.

  8. Do not believe the Jobs/Apple hype for the Retina displays which gives you the 60 pixels per degree you’re using here.

    You should change your calculator to the more industry accepted limit of human vision of between 0.3 to 0.4 ArcMin per pixel or 150 to 200 pixels per degree.

    This would make a huge difference on what people could perceive where a 1080p 50″ display could now be noticeable out to 20 feet rather than the 7 feet you’re stating now.

    1. This comment intrigued me, so I did some research, and it is true. Jobs’ claim was based on 20/20 vision, which is a long way from being the best humans can do. Raymond Soneira, a go-to guy for displays, suggested 0.6 arcmin, but most analyses hover between 0.3 and 0.4. Take a look at Clarkvision’s page on eye resolution, or the cultofmac’s article on why retina isn’t enough.

  9. Great tool 🙂
    Could you add recommended ft.lamberts for HDR?

  10. Ok looking at a 60inch 4K TV… The ideal viewing distance is… 46,8 inches??? This can’t be true… You buy a 60 inch to sit comfortably AWAY from your TV not so you have to sit almost NEXT to it!

  11. We have a projector lift placed around 7 feet above the ground at 9 meters away from the screen size of 110inches, the previous projectors throw was good but we are not unable to find a projector which can be placed 9 meters away and can project 110 inches. Many different projectors we tried end up in a very large projection area, can you please assist on what kind of a projector we would require or what is the best solution.

    1. Author

      No standard projector is going to give you a screen that small from a distance that far away. Your best option is a higher end projector that can accept an optional long-throw lens. Search google for “long throw projector lens” and even that may not give exactly what you want.

  12. Thank you so much for sharing this – I was using a website to calculate viewing angles but this makes it so much simpler.

  13. Was there a particular reason you didn’t include a screen size calculator based on room size and/or seating distance?

    1. Author

      @Jeffrey, good question. The result is the same, but the starting point is different (enter TV size to get seating distances or enter seating distances to get TV sizes.) The reason that I started with screen size as the input is that it’s not very user-friendly to enter a seating distance and then show a recommendation for a 97-inch diagonal flat panel. For people who want 4k, giant screen sizes would be what is recommended for most seating distances. Most people want a flat panel TV, and most flat panels are 75-inches or smaller. So instead, I start the TV size, because most people know the size they think they want, and then showed resolution detail for different seating distances. And finally, it’s a lot easier to change the seating distance than it is to change the size of the TV you already own!

  14. Hi, my sofa is 375cm from the tv, I wanna see hd, and 4k films, serials. Which size of tv should be recommendable? I was thinking about 65″ to 75″

    1. Author

      @Ikki: at that seating distance (375 cm / 148 inches / 12.3), a 75-inch TV is my recommendation. An even larger screen would be better, but there are not many flat panel TVs in that size range at a reasonable price.

    2. So, I have a 75in Sony 4K and sit 368cm away… Roughly about 12ft…. Get the 75in … Enjoy!!!!

  15. My viewing distance is 7” and I’m looking for the best size 4k HDR tv. Came across this great tv that comes in 49inch which cost just as much for a 55inch. I understand the full benefits of sitting closer to appreciate 4k but we are talking a top notch 49inch tv with so many features compared to a less advanced 55inch. Take into consideration that my viewing distance is 7-7.5” the most (wall to wall). Be an angel and help me out here. Thanks!

    1. Author

      There isn’t a huge difference between 49-inches and 55-inches. But don’t underestimate the impact of a larger screen. Given the continual drop in prices and screens getting bigger, I think the 65-inch TCL is a great option to consider.

  16. I am going to build a new theater room. I would like to purchase 4K projector and size the room accordingly for a 120″ screen. If I do that, I want the front row to be about 7.5′ from the screen which looks good on your room design calculator. My question is that most content will probably be at 1080P. I know the projector will try to upscale to 4K, but I wonder if the picture resolution will look granular for this type of content. To future proof the room, the 4K dimensions seem to be desirable but not if all of the 1080P content will look fuzzy. The other 2 rows will be around 15 and 20 feet. What are your thoughts on the row lengths from the screen in this case?

    1. Any thoughts on the distance for then3 rows? Would the first row be good for 4K and the other rows good for 1080P? I guess upscaling quality will really be based on projector quality, content, …

      1. Author

        BobL: Upscaling gives almost no perceivable increase in picture quality. A 1080p image has only 25% of the pixels of a 4k image. The upscaler would have to accurately create the missing 75% of the 4k image to deliver something that is true 4k resolution. It’s just not possible to do that, especially for video sources with varied and moving content. Upscaled images will always look much more like their native resolution than the resolution to which they are upscaled.

        When it comes to making the most power possible from an engine, there is a saying “there’s no replacement for displacement” i.e. bigger engines will always produce more power than smaller engines of the same design. The same is true for resolution. There’s no replacement for high-resolution source material.

        You should design your seating distances around your primary seating row. Usually, that’s the first row. Every other row will be a compromise, but also won’t be used as often as the primary row, and that’s OK.

    2. Hi. My home theater room is 15 feet wide and 20 feet long. The ceiling height is 8 feet. We plan on getting a 4K projector and a 120 inch screen. We would like to have two rows of recliner chairs. Based on this information, how far would you place the first row from the screen. Also the second row will be on a platform, would a one foot height for the platform be enough to clear the view for those sitting in the second row. Lastly how much space would you advise be kept between the first and second row for optimal viewing?

      1. Author

        Hi Nam. I recommend that you enter all of those numbers into the spreadsheet. It’s going to give you more detailed results than my informal feedback. That said, I can give some general numbers. The second row recliners should be 18 inches above the first row so keep the screen from being blocked by heads in the front row (otherwise, the screen has to be mounted high on the front wall, which is uncomfortable for the first row.) There needs to be room between the rows for the recliners to extend. The front row seating distance should probably be at about 10-11 feet from the screen. You don’t want the second row to be right against the rear wall – there should be some gap to not be too close to the rear speakers.

  17. Hi. My media room is 11′ x 11′ and my viewing distance is 9 to 91/2 feet away. I’m planning to purchase a 100″ projector screen and the Optima 4K Ultra Short Throw projector for this room. Will the 100″ screen be too big from my 9′ to 91/2′ viewing distance?

    1. Author

      Your screen size and seating distance are great. The screen is not too big. The only possible issue is if you play a lot of fast-motion video games; those are usually better on smaller screens.

  18. The “Minimum distance” or “closer than” statements in your article are factually incorrect. Your calculator gives the distance required to resolve the resolutions for a given TV size fully. You do NOT want to sit closer than this distance because then you will be able to see individual pixels on the TV, this is a BAD thing. In fact the whole range thing is nonsense. As far as visual acuity is concerned, there is ONE optimal distance from a TV. The distance where you can fully resolve it’s resolution, no closer, no further away. Closer is bad because as above it lets you see individual pixels, not the image as a homogenious whole; futher away is bad because then you don’t get the full benefit of the TV resolution.
    Summary, you should never sit closer to your TV than the calculator distance shows, because you will gain ZERO extra detail, (unless your vision is better than 20/20, which is of course possible), in fact you will start to be able to see the actual pixels on the screen which is a BAD thing! So the minimum distance statement is bad advice.

    1. Author

      I initially thought about it the same way as you are describing, where there is only one “perfect seating distance” for resolution. However, I later came to the conclusion that is in fact not correct. The reason is that distance at which the pixel structure starts to break down is much different than the distance at which “eye resolution” matches “screen resolution.” If you don’t believe me, try it out. You won’t be able to see the pixel structure on any modern display at the recommended minimum viewing distance. You have to be substantially closer. This is because the fill ratio of modern pixels is very high – 90%+. So you have to be about 90% closer than the minimum viewing distance to see the pixel structure.

      Also, making viewing distance considerations based only on the screen resolution is also a flawed approach. There are many other factors, such as viewing angle (for immersiveness). Also, room dimensions and setup has more of an influence as well.

      But the big takeaway is to test it yourself and not just look at the numbers.

  19. We are planning to buy a home which has a media room 11.10ft wide and 19.5 ft deep and planning to put a 100″ projector screen. Based on the above, could you please advise if we will be able to have two rows of 3-4 recliner seats each, second row on a riser?

    1. Author

      Yes, no problem. That’s approximately the same dimension as my theater pictured here.

      1. I have a 20ft wide 26 ft length room with 12 ft ceiling height. What is the maximum screen size I can opt for viewing in HD .

        1. Author

          I can’t give you a specific answer. It depends on your seating distances and how bright you want your screen to be. I suggest putting some numbers into the Calculator and seeing what it tells you. However, in general, I tend to think that Screens larger than 135 inches diagonal result in images that are Not bright enough.

  20. CB, I cannot thank you enough. Your spreadsheet has been envaluable. Question, when calculating first/second row distance to screen, is that based off of the chair, the person sitting, or ??. Also, if row 1 and 2 are fully reclined to max lenghth of 68″, how much distance to I place between the rows? In the event someone wishes to walk past a person reclined with leg extension out. Thank you.

    1. Author

      Hi Danny, Thanks for the positive feedback! The seating distance is “eyeball to screen” distance, which is almost the same as the distance to the back of the chair when it’s upright.

      The distance between the chairs depends on how big the room is and how much you use the back rows. For me, I didn’t have a huge amount of space in the room and there wasn’t often someone in the back row reclined – and when there is, there isn’t often someone getting up and walking past them. If you’re in a similar situation, then 12-inches between reclined chairs should be plenty. Just enough for a person to walk sideways between the rows during the rare situations when there are 2 reclined chairs in 2 rows.

      1. I have a 16ft x 16ft theatre room. Should I put a 150 or 135 inch screen for better viewing experience

        1. Author

          150-inches is too big for a room that size. Go with the 135-inch screen if you have only 1 row of seating. If you have 2 rows of seating, the front row will be very close the screen and you probably would want the screen to be even smaller than 135-inches.

    1. Author

      That’s a very big screen. Bigger screens result in dim images. The fixed amount of light from the projector is spread out over a larger screen area, so it’s dimmer. Also, you probably won’t have complete light control if outside. Both of these factors means you’ll need a brighter projector to have an image that’s not too dim.

  21. Hi Carlton,
    Thanks so much for all the details you have on this site, it is a huge help! I’m just starting the process of planning out my basement build with a theater room and have up to a 19′ x 19′ space I can dedicate to it. I see you have a 13′ x 22′ room with a 123″ screen but you mentioned somewhere (been reading tons of comments so forget where) that you sit 11′ from the screen. Is that your first row and your back row is all the way back at around 22′ from the screen? I plan to build the back row starting around 3′ from the back wall so probably sitting 16′ from screen for the back and maybe 10′ for the front row. I had 150″ screen in mind since the room is pretty wide but based on the seating distance, I’m getting 130″ for max screen size. Do you think the better compromise is to go with a bigger, 150″ screen since room is wide or go with smaller 130″ screen since room is too short? Or maybe even be more drastic and change dimension of room to make it a bit more narrow (19′ x 13′ maybe) if that is more ideal for a theater room? Also lastly do you have any suggestions for short throw projectors ideally under $2k? I have a beam that hangs about 1′ down right down the middle of the room at around 9′. Ideally I’d like to mount the projector in front of the beam throw distance of 6′ – 8′ for whatever screen size I end up going with. Otherwise I’m guessing the projector will need to hung on about a 24″ pole to ensure it clears the beam and could be an eye sore right above the seating area.

    1. Author

      Mo, I think a screen in the range of 130-inches is about right for your room. The images tend to not be bright enough for bigger screens. I wouldn’t make the room narrower just to have the screen reach wall-to-wall. I wish my home theater room were wider to accommodate more walkway space and to feel a bit more open. Design the room around your seating and the screen around your projector and viewing distance.

      I don’t know of any good short-throw projectors. There are short-throw lenses for some higher-end projectors, but they that gets expensive. Your best bet may be a projector on the back wall of your room or an ultra-short throw projector mounted just above the screen. For best image quality, the standard-throw JVC projects are the best, and Epson 5040UB is best for the price. Cheaper projectors have very inflexible optics that make them a complete pain to mount and get right.

  22. Building a home theater that is 17.5 x 23 with the screen on the 17.5’ wall. Looking to try and maximize potential but would ideally like 2 rows with lounge seating in the back, so essentially 3 rows. Trying to figure out how big of a screen we can get and still not be too far out of specs when it comes to viewing distances from the front and from the back. Trying also figure out where to build our step down to the first row in relation to screen.

    1. Author

      Trey, you can’t really optimize for all rows. Optimize for the primary seating row first. The other rows will still have a great viewing experience. Be careful about going too big for the screen size. The bigger the screen, the dimmer the image, and every row will suffer if the image is not bright enough. Based on the limited information, my initial guess is your screen should be 135-inches max, 120-inches minimum.

  23. Hello,
    We are buying a house that has an area in the basement that is 13.5ft wide x 23.7 ft long and 9 ft ceiling. Can you please advise what size screen and if possible to have 2-3 rows of seating. Will have raiser. Wondering if 2 rows and 3rd row of bar/stools would be a better fit. What is the distance of placing the 1st row of seats. Thank you

  24. The cells where I’m supposed to be able to enter custom aspect ratios are protected.

  25. Hi ,
    I’m planning to buy an oled TV, and am uncertain between a 77 and 65 inch size. I will sit (eyes distance from screen) at around 185 cm (6 feet) from the screen. At the shop I was suggested to go for the 65 because of the light intensity : they say that a 77 would be uncomfortable from that distance (small room size) and cause eyes stress.
    Can someone help me out? Do you share that view? I should I go for the 77 or the 65?
    Thank you

    1. Author

      If you’re playing fast motion video games, the 77 inch may be a little too big. For anything else, the 77 inch would be a great choice. But the 65 inch would be fine also. It’s more about how big it is in your room and if you are OK with the aesthetics. I suggest putting some masking tape on the wall to show how large the screen would be to make sure the screen size is acceptable.

  26. Hi Carlton, Ive bee messing with your excel sheet to try and calculate throw for an Artograph Flare 450 art projector Ive bought for my wife for xmas. Ie I’ve been trying to generate an excel sheet that calls image size for various throws, not quite the same as what your spread sheet was designed to do but I thought I could modify but I am struggling. I know how to calculate image size based on aspect ratio but this assumes a “factor” back calculated from a table in the projector instructions….. I guess the lens/projector has a factor that dictates the screen dimensions based on throw. Artograph say that throw range is 10” – 120” and give a table for throw v image diagonal but my calc results are inconsistent with theirs using their “factor” for a 19” throw which gives a 20” diagonal to calculate subsequent 30, 40, 50, 60 diagonals. Any words of wisdom ?

    1. Author

      Here’s how I would approach it: Take the existing spreadsheet and enter a diagonal screen size from the manual of the projector throw length table. In different cell, enter the maximum and minimum throw distances for that screen size. Then calculate the minimum and maximum throw ratio using either the screen width or the screen height (not the diagonal screen size.) The short throw ratio would be (minimum throw distance) / (screen width). The max throw ratio would be (max throw distance) / (screen width). You should then be able to use those ratios to calculate min/max projector distance for each screen size.

      To summarize, I don’t think you should use diagonal screen size to calculate the ratios, but rather screen width or height. I haven’t done the math to verify this, so this is just my quick thought. Also, the throw distance tables in most projector manuals aren’t precise, but your calculations should generally be fairly close. I hope this helps. Let me know how it goes!

      1. Thanks for the quick response, appreciated. The penny dropped when I read your reply and realised that the Throw ratio that was given with the projector (1.2) was based on W but the table they put in their instruction manual was Throw V Diagonal and thats why I couldn’t verify their image sizes – pretty basic error. Another oddity is that the table in the manual is based on an aspect ration of 16:9 whereas “standard” canvases are 4:3. So I have now generated a table of Throw V image size for both. Present is wrapped and under the tree and will let you know if there are any unforeseen issues. Many thanks for your help, have a Merry xmas and stay safe.

  27. Hi Carlton – going to be building my HT room next year and have a question, that I have had a tough time confirming an answer. The room size will be 26′ wide and 22′ long; I will have a 100″ screen with a planned viewing distance of about 9′ from seat, but with only 1 row of seating. The 6 seat config will be approx. 204″ wide, which takes the 2 outside seats out of a40 degree angle. My question is can I lengthen the distance to maybe 12′ to help with that or second option perhaps turn those 2 outside seats towards the screen on an angle or do I need to truly consider a second row? Much appreciate your thoughts – Jim

    1. Author

      Hi Jim,

      You have a pretty big room, so the good news is that you have lots of options. The most important question to ask yourself is “how often will people be sitting in those outside 2 seats?” If the answer is “rarely”, then I wouldn’t worry about it too much. I think people occasionally sitting there will be more than impressed with the screen/picture/sound. Of the options you listed, I would not recommend moving the front row back. That’s a good seating distance for a 100-inch screen. If you’re OK with the aesthetics, having the 2 outside chairs curve inwards sounds like the best idea.

      Adding a second row is definitely more work. It needs to be up on a riser and you may want to do 4 chairs in the back row instead of 2 (so front and back rows match.) Both of those changes add cost and change the room layout, perhaps taking up space you were wanting to use from something else. A cheaper/easier 2nd row option would be to put a tall bar table behind the first row with some comfortable bar chairs (takes up less space, is cheaper/easier to do.) That would give more seating options. But it’s really up to how you want the room to look and how you think you will use it.

      One additional consideration you didn’t mention is using a larger screen. Your room is certainly big enough for a larger screen, but I don’t know how much ambient light you will have and how bright your projector will be. If the room is completely dark, most projectors work pretty well up to about a 135-inch screen. Something else to consider.

  28. Hello Carlton – thanks so much for your response. I really appreciate your insights, not just to my question, but all the ones above. Planning a Home Theatre can be stressful as I want to get it just right, and all of your help above has made this easier for me. To answer your questions, there will be zero ambient light, and the 2 outside chairs will be used rarely; 80% of the time it will be 4 people watching…so maybe merely turn the chairs inward when using? And leaving them straight across normally. On the idea of going up to a 135″ screen/projector, I had recently demoed the 100″ Sony X92 LED with Dolby Vision on, I was blown away. I am not aware of any projectors with DV, but if you can recommend one in that $$ neighborhood with a comparable picture I will definitely check them out. Once again – thanks for your continued insights.

    1. Author

      Jim, sorry for the delay in responding.

      I think having six seats in a single row is your best option for seating, based on what you’ve described.

      A front projector is never going to be as bright as an LED backlit TV. However, in a room that’s totally dark, that TV is probably going to be too bright. You only need full brightness in a well lit room. It can be overwhelming otherwise.

      The only projector that I can recommend without hesitation is the newest projectors from JVC with the laser light source. They are very bright for a front projector, and have fantastic contrast ratios.

      I don’t think you should worry too much about Dolby Vision specifically. Any type of HDR is going to give a very similar result, despite all of the Dolby marketing that says otherwise. The JVC projectors utilize a special frame by frame contrast comparison that gives a result very similar to Dolby Vision. You’re not going to get quite the same dynamic range, but it’s still going to be a very impressive picture. Having a 135 inch screen creates a dramatic impact that a smaller screen will not. I highly recommend that you at least demo one of these JVC projectors at one of your local home theater installers.

      I hope this helps!

  29. Thanks for following back up – appreciate your thoughts once again; and I will now go and check out the JVC projectors and see what they are all about.

  30. First off, great webpage. Most helpful. Just wanted to confirm some assumptions. I entered 110 inches diagonal as a screen size which output 14′ or closer seating for 1080p. 4K was 7′. My seating is at roughly 12′. Does that mean I’d be better off buying a 1080p projector? Would 4K be wasted at a seating distance at 12′? I assumed 4K would be recommended but your webpage is giving me pause. Thanks in advance for any recommendations or direction for my particular setup. Specifically, best projector solution (resolutions, brand, etc) at my specs.

  31. Hi Carlton,

    I will be building a home theater and would be very grateful for your feedback. My theater will have absolutely zero ambient light and will be 13’9” wide by 19’6” deep. (All right or left references that follow will be as viewed from the rear of the theater).

    My preliminary plan is tentatively as follows:
    an aisle of 2’9” on the left side
    2 rows of 4 reclining theater chairs for the remaining 11’0” from the right wall
    the screen is tentatively 133” diagonal (123”W by 72”H)
    distance from the screen to the 1st row is tentatively 12’
    distance from the screen to the 2nd row is tentatively 19’

    What would be the ideal:
    distance from the screen to the 1st row
    distance from the screen to the 2nd row (the distance between the rows can be between 4’ to 7’)
    distance from floor to screen bottom

    I will be grateful for your response.

    1. Author

      Hi Steve,

      Sorry, I missed your question and I’m just now seeing it. I think you should do your seating distances based on field-of-view and not resolution. So seating distance will be based on screen size and not projector resolution. For a 133-inch screen, the 12-foot seating distance is ideal. The second row is fine at 19-feet, just make sure it’s high enough to view over the first row.

      For screen height, you want seated eye level (typically about 40 inches) to be about 1/3 the way up from the bottom of the screen (24-inches in your case.) This would place the bottom of the screen about 16-inches from the floor. This is typically the highest the screen would be. You can go lower, but the second row will need to be even higher above the first row to have an unobstructed view.

  32. I forgot to include that initially I will be using a JVC DLA-X30 1080p, which is still working great. But plan to replace it with 4K so would appreciate 2 sets of answers based on each resolution. Thank you

  33. can u let me know if 10 feet and 16feet room size sufficient for home theater

    1. Author

      Yes it is large enough for a single row theater, so second row if really close to the rear wall. You wouldn’t need a huge screen. A large TV make be a good option instead of a screen/projector.

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