Calculators

TV Size & Viewing Distance Calculator

Find the ideal TV size for your viewing distance, or the best seating distance for your TV, using SMPTE and THX guidelines.

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Enter your values and press Calculate.

How to use the TV Size & Viewing Distance calculator

With 4K content you can sit closer, or buy bigger, without seeing individual pixels — so the THX size is a good target for 4K TVs.

Formula

Screen width = 2 × distance × tan(angle ÷ 2); for 16:9 the diagonal is width ÷ 0.8716. SMPTE recommends a 30° field of view, THX about 40°.

More tv & video calculators

Screen Size CalculatorWidth and height from diagonal and aspect ratio.Aspect Ratio CalculatorResize images and video keeping proportions.PPI / Pixel Density CalculatorPixels per inch of a screen.Projector Throw Distance CalculatorDistance from projector to screen.