Convert between lumens and nits using your screen's physical dimensions, and translate between CIE xy chromaticity coordinates, correlated colour temperature, and Δuv — the numbers that define where your white point actually sits.
Input your projector or display's lumen rating and your screen diagonal. The calculator derives the screen area and applies the photometric formula to give you surface brightness in cd/m².
Take the CIE x and y coordinates from your calibration software or colorimeter report. The calculator uses Robertson's 1968 isotherms to find the nearest correlated colour temperature and Duv — how far your white sits from the Planckian locus.
Reverse direction: give a target CCT and Duv to find the corresponding xy chromaticity. Useful for setting calibration targets or checking what xy your display should achieve for a given standard.
Enter your seating distance to find the recommended screen size per SMPTE (30°), THX (36°), and immersive (40°) standards — or work backwards from a screen size to find ideal seating distance.