Utilities
Luminance Converter
Convert luminance between candelas per square meter, nits, stilbs, lamberts, foot-lamberts, and apostilbs locally in your browser.
Convert luminance between candelas per square meter, nits, stilbs, lamberts, foot-lamberts, and apostilbs. Zero is a valid luminance.
Conversions run locally in your browser; your luminance is not uploaded or stored.
Convert one luminance value into the units you need.
Enter a non-negative luminance value and choose its unit to see the equivalent candelas per square meter, nits, stilbs, lamberts, foot-lamberts, and apostilbs. 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 luminance units can I convert?
Enter a luminance in candelas per square meter, nits, stilbs, lamberts, foot-lamberts, or apostilbs. The converter returns the equivalent value in all six units using 1 nt = 1 cd/m², 1 sb = 10000 cd/m², 1 L = 10000/PI cd/m², 1 fL = 10.763910416709722/PI cd/m², and 1 asb = 1/PI cd/m².
Can I convert zero or decimal luminance values?
Yes. Zero is a valid luminance, and decimal values are accepted. Negative values are rejected because a luminance magnitude cannot be less than zero. Results show up to six decimal places when needed.
What happens with very large luminance values?
The converter shows an error when the entered luminance is too large to convert safely, instead of returning an unreliable rounded result.
Does my luminance leave my browser?
No. The conversion and copy action run locally in your browser. CodeASystem does not upload or store the value you enter.