LCH to Lab converter
Useful when you need a* and b* for a color difference or for software that does not accept LCH.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter lightness l*, chroma c* and hue angle h.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
a = C cos(h), b = C sin(h), and L stays the same.
Example
Inputs: Lightness L* = 60, Chroma C* = 50, Hue angle h = 120 °. Result: Lab values: L* 60, a* -25, b* 43.3; Lightness L*: 60; a* (green to red): -25.
Limits and caveats
- The result keeps the same reference white as the LCH values you entered.
Questions about this tool
Is 360° the same as 0°?
Yes, both angles give the same a* and b*.
What happens when chroma is zero?
a* and b* become zero and the color is a neutral gray whatever the angle.
Can the result be impossible to display?
Yes, Lab is larger than sRGB. Use Lab to HEX to check whether the color fits the gamut.