Electronics calculator
What Projector Screen Size Do I Need?
Enter viewing distance, target horizontal field of view, and aspect ratio width to work out projector screen size.
Enter your measurements
What Projector Screen Size Do I Need? The answer depends on viewing distance, target horizontal field of view, and aspect ratio width. This calculator keeps those inputs separate and reports projector screen size rather than relying on a generic size label.
- Viewing distance — Required
- Target horizontal field of view — Required
- Aspect ratio width — Required
- Aspect ratio height — Required
Projector screen size
Enter the measurements above to calculate projector screen size.
How the calculation works
V12 calculation: screenWidth=2×viewDistance×tan(toRadians(targetFov)/2); screenHeight=screenWidth×aspectHeight/aspectWidth; diagonal=sqrt(screenWidth^2+screenHeight^2). Angle inputs are explicitly converted to radians before trigonometric functions where required.
Worked example
Example: Viewing distance = 250 cm; Target horizontal field of view = 30 °; Aspect ratio width = 16; Aspect ratio height = 9. Result: Diagonal = 153.72 cm; Screen Width = 133.97 cm; Screen Height = 75.36 cm.
Before you decide
Measure the actual item, opening or body dimension involved. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what projector screen size do i need, the limiting result on this page is projector screen size.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Projector Screen Size calculator tell me?
It returns projector screen size from the measurements entered on this page. The calculation is specific to projector screen size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for projector screen size?
Measure viewing distance, target horizontal field of view, aspect ratio width, aspect ratio height. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the projector screen size?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned projector screen size while allowing for the clearances, tolerances or ratings shown by its manufacturer.