Utilities
Illuminance Converter
Convert illuminance between lux, kilolux, foot-candles, phot, nox, and lumens per square inch locally in your browser.
Convert illuminance between lux, kilolux, foot-candles, phot, nox, and lumens per square inch. Zero is a valid illuminance.
Conversions run locally in your browser; your illuminance is not uploaded or stored.
Convert one illuminance value into the units you need.
Enter a non-negative illuminance value and choose its unit to see the equivalent lux, kilolux, foot-candles, phot, nox, and lumens per square inch. Zero is valid. It runs locally in your browser, so your value is not uploaded or stored.
Frequently Asked Questions
Everything you need to know about this tool, how it works, and privacy.
Which illuminance units can I convert?
Enter an illuminance in lux, kilolux, foot-candles, phot, nox, or lumens per square inch. The converter returns the equivalent value in all six units using 1 klx = 1000 lx, 1 fc = 10.763910416709722 lx, 1 ph = 10000 lx, 1 nx = 0.001 lx, and 1 lm/in² = 1550.0031000062002 lx.
Can I convert zero or decimal illuminance values?
Yes. Zero is a valid illuminance, and decimal values are accepted. Negative values are rejected because an illuminance cannot be less than zero. Results show up to six decimal places when needed.
What happens with very large illuminance values?
The converter shows an error when the entered illuminance is too large to convert safely, instead of returning an unreliable rounded result.
Does my illuminance leave my browser?
No. The conversion and copy action run locally in your browser. CodeASystem does not upload or store the value you enter.