How to use Luminance Converter
- Enter a nonnegative luminance value.
- Choose the source and destination luminance units.
- Convert and copy the result with its unit.
Example: Luminance Converter
Convert a stilb value into the SI unit.
You add
Value: 1. From: stilb. To: cd/m².
You get
1 stilb = 10000 cd/m².
Options
- Luminance unit
- A nit is a candela per square metre. Other supported units convert the supplied luminance without changing a source measurement into lux.
- Decimal places
- Check the luminance unit with every rounded number, especially when changing from a small candela-per-area value. The selector offers 0, 2, 4, 6 or 8 places without estimating a screen measurement.
Supported inputs and limits
Luminance units only. A nit equals one cd/m². No illuminance-to-luminance model, viewing geometry, display calibration or brightness recommendation is included. Values accept at most 64 characters, 40 significant digits, 20 fractional places and magnitude 10¹⁸. Scientific notation has at most two exponent digits. Display rounding offers 0, 2, 4, 6 or 8 decimal places; small nonzero results stay visible.
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Luminance is not illuminance
A stilb is a candela per square centimetre, so 1 stilb equals 10000 cd/m². Luminance and illuminance are different quantities; screen brightness alone cannot be converted to room illumination with a unit factor.
Questions about Luminance Converter
Is one nit the same as one cd/m²?
Yes. Nit is a common name for candela per square metre.
Can I convert a lux reading here?
Lux is an illuminance unit. Converting it into luminance requires information about a source or surface beyond a scale factor.
Does this compare perceived brightness?
No. Perception depends on context, adaptation and other properties. This page converts a supplied physical quantity.