Electronics calculator
What TV Size Do I Need for My Viewing Distance?
Find recommended tv diagonal from viewing distance and target horizontal field of view.
Enter your measurements
What TV Size Do I Need for My Viewing Distance? Start with viewing distance and target horizontal field of view. This recommended-size calculation turns those measurements into recommended tv diagonal, so you can compare real products or available space before making a decision.
- Viewing distance — Required
- Target horizontal field of view — Required
Recommended TV diagonal
Enter the measurements above to calculate recommended tv diagonal.
How the calculation works
V12 calculation: screenWidth=2×viewDistance×tan(toRadians(targetFov)/2); diagonal=screenWidth×sqrt(16^2+9^2)/16. 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 °. Result: Diagonal = 153.72 cm; Screen Width = 133.97 cm.
Before you decide
Use the finished, usable dimensions after trim, handles, skirting, packaging or other projections where relevant. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what tv size do i need for my viewing distance, the limiting result on this page is recommended tv diagonal.
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 TV Size for My Viewing Distance calculator tell me?
It returns recommended tv diagonal from the measurements entered on this page. The calculation is specific to tv size for my viewing distance, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for tv size for my viewing distance?
Measure viewing distance, target horizontal field of view. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the recommended tv diagonal?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned recommended tv diagonal while allowing for the clearances, tolerances or ratings shown by its manufacturer.