Projector Throw Distance and Screen Size Calculator

Your details

The diagonal measurement of your projected image.
in
Throw ratio = Throw distance / Screen width. Check your projector spec sheet.
Screen gain multiplies apparent brightness. 1.0 = matte white (neutral). Higher values concentrate light toward the center but narrow viewing angles.
More ambient light requires a brighter projector to maintain acceptable contrast.
Throw distanceStandard Throw
13.07

Projector lens to screen surface

Throw distance (cm)398.5
Throw ratio1.5
Projector typeStandard Throw
Screen width104.6
Screen height58.8
Screen diagonal120
Recommended lumens684
Distance unitft
Size unitin
Throw distance13.07
Screen width104.6
Screen height58.8
1.5
Ultra-Short Throw<0.4Short Throw0.4-1Standard Throw1-2Long Throw2+

Throw distance: 13.07 ft for a 120 in image (throw ratio 1.50).

  • A throw ratio of 1.50 means the projector must sit 1.50 units back for every 1 unit of screen width.
  • This ratio (1.50) classifies as a Standard Throw projector.
  • For a dark room with a 1.0 gain screen, aim for at least 684 lumens.
  • Add 10-20% headroom to the lumen estimate: projector brightness fades as lamps age.

Next stepStandard or short-throw projectors can be ceiling-mounted or placed on a shelf - check the lens shift range for vertical alignment.

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