HS Tools
Projector
Projector Throw & Brightness
Image size from throw, distance for a target image, and screen brightness vs ambient.
Setup
Throw ratio (D/W)
Aspect
16:9
16:10
4:3
2.39:1
1:1
Units
meters
feet
Image size from distance
Throw distance
Distance for a target image width
Desired image width
Brightness
Projector lumens
Screen gain
Uses image from
distance above
target width above
Screen luminance = (lumens × gain) ÷ (π × area). Rough targets: dark cinema ≈ 14 fL (48 cd/m²); lit room wants 30–50+ fL.