Question 1

What contrast ratio is required for WCAG AA?

Accepted Answer

WCAG AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px bold or 24px regular).

Question 2

What is the difference between WCAG AA and AAA?

Accepted Answer

WCAG AA requires 4.5:1 for normal text. WCAG AAA is stricter at 7:1 for normal text and 4.5:1 for large text.

Question 3

How is contrast ratio calculated?

Accepted Answer

Contrast ratio is calculated using relative luminance: (L1 + 0.05) / (L2 + 0.05), where L1 is the lighter color and L2 is the darker color.

Question 4

What percentage of people have color vision deficiency?

Accepted Answer

Approximately 8% of men and 0.5% of women have some form of color vision deficiency, making accessible contrast essential for inclusive design.

COLOR CONTRAST CHECKER