Home Theater Calculator: Viewing Distance, Screen Size

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_v4.0.xls

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

Revision history:

  • Version 4.0 – 26-August-2008: Added Anamorphic (horizontal expansion) front projector lens option, which adjusts projector brightness and throw ratios when selected.
  • Version 3.7 – 14-June-2008: 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 – 21-July-2007: 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 – 20-July-2007: 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 – 27-June-2007: Widened columns that were causing being truncated for international users.
  • Version 3.3 – 16-Feb-2007: Added 2.35:1 aspect ratio back.
  • Version 3.2 – 13-Feb-2007: 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 – 15-Dec-2006: 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 – 13-Dec-2006: 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 – 01-Dec-2006: 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 – 20-Nov-2006: 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 – 29-Sept-2006: Edited notes fields to improve clarity for data entry fields.
  • Version 2.6 – 09-May-2006: 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 – 27-Nov-2004: 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.
Written by on 2006-Nov-11, Last updated on: 2006-November-11 in: |


  • John says:

    Hi carton, thanks its really great to read your post a lots of information. I just started researching on this, we are building a dedicated home theater room with site of 15 X 24 feet. Just wonder what is the best fixed screen I can go with along with the projector you can recommend. 3 row, each of which are 5 feet apart. can you please help.

    • Carlton Bale says:

      John, with 3 rows, the first will be extremely close to the screen. Maybe too close. You should be ok with a 123-inch screen. JVC projectors are awesome, Sony and Epson are good alternatives.

  • muralidhar says:

    hello carlton
    I have a small room of size 10ft in width and 12ft in depth can I make a home theatre in this dimensions for a four seater pls suggest me weather to go for ohp or tv of which sizes

  • G R Malik says:

    i am using 325 inch diagonal screen (285 x 160 inch) first row is 28 feet away ,last row is 8t feet away, is it ideal screen size or what will be ideal screen size

  • Andy Boerjan says:

    I have a room that is going to be 19’6” wide and 28″ long with three rows. First row 14′ back, 2nd row 20′ back and 3rd row 24′ back First row is in a sunken area that is 24” below basement level, then next level is 8” below, and finally the 3 level is basement level but the seating will be bar height. what would you recommend for screen size. I would also live to have my speakers behind the screen, so I would take a brand recommendation also!

    thanks in advance!!!!!

  • Augeman says:

    What screen size would you recommend for HT 16′ wide x 18’Long with 3 row seats. Viewing distance to first row seat is 8 feet away and there after an increment of 4 feet. I have the Epson 5030UB and I am torn between 110″ and 120″ diagonal screens. Thanks!

  • David Jacobs says:

    Hello Carlton. I have a Media Room and am considering adding front projection. I have been going back and forth with the idea of 2.35:1 or 16:9 for a projection screen. Thanks for the most excellent Calculator as it allows me to populate a screen size in 16:9 and utilize the image width to estimate the size of a 2.35 image projected on to the screen. Pretty nice!! BTW considering SI Series 5 Slate and Sony VPL-VW600ES would go with 350 if it had Lens Memory function.

    Thanks Again


  • matbos says:

    Carlton, i have a room of 12ft wide x 30ft length , and height of 10ft ,i wanna accomodate approx 4 seats each in 3 rows ( total 12 person seating capacity). Can u suggest me a projector for viewing 2d and 3d content . Projector should be such thaT a viewer sitting at 30 ft distance from the screen can see crystal clear 2d and 3d video images similar to he one sitting at the first row.
    First row will be at a distance of 10 ft from the screen .
    The projector will be used for commercial purpose daily 8 to 10 hours of viewing.
    I wish to go for domestic range of home projectors for commercial use and not for professional range costing thousands of dollars.

    Thank you

  • Nandesh says:

    Hi Carlton, we’re building a home and have dedicated a 10’H x 15.5’W x 16.66’L room for a media room. A good friend is telling me that these dimensions will be horrible for standing waves. Can I pull it off?? How large off a screen do you recommend?

    Great website with lots of great info! Thanks!

    • Carlton Bale says:

      Nandesh: That’s interesting advise for standing waves…because every room is horrible for standing waves! The size of the room changes the frequency of the standing waves, but there is no ideal room size. I suggest you check out this post for acoustics: http://carltonbale.com/home-theater-room-acoustic-design-tips/

      For the screen, enter your details in the calculator and see for yourself. I think 123″ or larger screen would be appropriate, assuming you have proper light control.

  • leondajames says:

    I have a small room like 9×15 I am only having two rows what is the distended I can place the chairs if my screen is 1080 and 100 inches

  • Sameer says:

    Hello my name is Sam and I very much new to Projectors. I have a screen installed in my home that is 135” diagonal. I wanted to know what all things I need to consider while buying projector.

  • G R S RAJU says:

    my room size is 13feet width, 17 feet deep and height of 10feet can i go for home theater ? is so what size of the screen

  • Justin says:

    I have a room that is 2.65 meters wide and 3.8 meters long. I have bought a glass bead projector screen at 100″. I am worried it is far too big for the room. I have used your great calculator tool and it seems to say the front row (that is 7.5 feet away from the screen) is ok but I am worried it will look far too big. Any comment son the size of the screen?



  • Tiffany says:

    What’s the standard height for a movie screen off the floor?

    • Carlton Bale says:

      The ideal height for a screen is where the center of the screen is at eye level. Typical distance from the floor for an average screen is 14 to 18 inches, but can vary based on seating, number of rows, room aesthetics, etc.

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