Color Contrast Calculator
Check foreground/background color contrast ratio against WCAG 2.1 AA and AAA compliance levels.
How to Use the Color Contrast Calculator
- Enter foreground RGB values (0-255).
- Enter background RGB values (0-255).
- Click Calculate.
- Check WCAG AA and AAA pass/fail results.
Casos de Uso
- •WCAG accessibility compliance
- •UI color palette validation
- •Accessible design system creation
Fórmula
Ratio = (L1 + 0.05) / (L2 + 0.05) where L = relative luminance
Perguntas Frequentes
How accurate is this calculator?
Results are based on standard industry formulas and are suitable for preliminary estimates.
What units are used?
Standard IT units (requests/sec, ms, %, USD) are used unless otherwise noted.
Is it free?
Yes, all calculators are completely free.