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Projector to screen distance ready reckoner

The projector to screen distance required for a desired image size is determined from the image magnification of the lens; if you use the screen width for your calculations, the distance will be the same regardless of the aspect ratio.

Don't know what an "aspect ratio" is?
Screen Width (feet)

 
Screen Width (mm)
1
1.3
1.5
2.0
2.5
3.0
5.0
7.0
Lens Magnification Ratio (x : 1.0)
4' 1219mm 4' 5.2' 6' 8' 10' 12' 20' 28'
Projection Distance (feet)
5' 1524mm 5' 6.5 7.5 10' 12.5 15' 25' 35'
6' 1829mm 6' 7.8 9' 12' 15' 18' 30' 42'
7' 2134mm 7' 9.1 10.5 14' 17.5' 21' 35' 49'
8' 2438mm 8' 10.4 12' 16' 20' 24' 40' 56'
9' 2743mm 9' 11.7 13.5 18' 22.5' 27' 45' 63'
10' 3048mm 10' 13 15' 20' 25' 30' 50' 70'
12" 3658mm 12' 15.6 18' 24' 30' 36' 60' 84'

N.B. When rear projecting remember to allow a few feet for the projector itself in your calculations!

 

 

 

 

 

 

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PowerPoint® Tips   ¦   Design Primer   ¦   Projection Distances   ¦   Screen Sizes