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About WCAG Color Contrast Checker Online
Overview
WCAG Color Contrast Checker Online. WCAG Color Contrast Checker Online: enter foreground and background hex colors; we compute the WCAG contrast ratio and whether normal/large text meets AA or AAA.
Tips
Calculator outputs recompute from the numbers you enter—double-check units (annual vs monthly rates, basis points, or calendar conventions) before you rely on totals for decisions. Export or screenshot rows you need to keep.
How to use this tool
How to use this calculator
Pick units or fields
Choose currencies, measurement units, or sliders that match your real inputs. Switch unit systems if the tool offers metric/imperial toggles.
Enter numbers carefully
Type values without thousands separators unless the field expects them. Use a dot for decimals unless the locale label says otherwise.
Run and read totals
Press Run and scan the breakdown—rates, amortization rows, subnet masks, or color chips depending on the tool.
Copy or screenshot
Copy key figures into spreadsheets or tickets. For color tools, copy HEX/RGB strings directly from the result card.