Lighten / Darken
Calculate Lighten / Darken instantly with the exact formula and a worked example.
Lighten / Darken
Lightness source%
Lightness target%
Δ HSL Lightness
20%
More about: Lighten / Darken
What it calculates
The “Lighten / Darken” calculator computes Δ HSL Lightness in % from 2 parameters: lightness source (%), lightness target (%).
Standard IT calculations for developers and sysadmins.
Example calculation
With parameters Lightness source = 100 %, Lightness target = 80 % the result is 20 %.
How to use
- Enter lightness source and lightness target — each field above is adjustable with a slider.
- Δ HSL Lightness (%) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Lighten / Darken calculated?
The Lighten / Darken calculator computes Δ HSL Lightness (in %) from lightness source, lightness target. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Lighten / Darken calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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