Color Contrast (WCAG)
Calculate Color Contrast (WCAG) instantly with the exact formula and a worked example. Free online calculator — no signup, works on mobile.
Color Contrast (WCAG)
(L1+0.05)/(L2+0.05)
Contrast ratio
4.5
More about: Color Contrast (WCAG)
What it calculates
The “Color Contrast (WCAG)” calculator computes Contrast ratio from 1 parameter: (l1+0.05)/(l2+0.05).
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Example calculation
With parameters (L1+0.05)/(L2+0.05) = 4.5 the result is 4.5.
How to use
- Enter the parameter values — every field above is adjustable with a slider.
- The result and related metrics are calculated automatically as you type.
- Use the additional metrics shown (if any) where needed.
- Copy the result or bookmark the page.