Screen Size Calculator
AV KART TOOLS
Screen Size, Viewing Distance & Brightness Calculator
Choose aspect ratio, enter any one dimension, and instantly get screen size, viewing distance bands, and a dark-room lumen target with adjustable screen gain.
Fast sizing
Screen + Distance + Lumens
Inputs
Enter any one value. The other two will auto-calculate.
Aspect Ratio
Higher gain reduces required lumens but may affect viewing angles and color accuracy.
Results
Distances are shown as far to close for both SMPTE and THX.
Diagonal
- in
Width
- in
Height
- in
Ideal Viewing Distance
Standard
Far
Ideal
Close
SMPTE
- ft
- ft
- ft
THX
- ft
- ft
- ft
Far and Close indicate practical seating limits. Ideal represents SMPTE (30°) and THX (40°) reference viewing angles.
Projection Brightness (Dark Room, SDR Reference)
Target Screen Brightness
50 nits
Required Projector Output
- lumens
Assumes dark room, 1.0 gain reference (adjustable), white screen, and proper calibration.