Contrast Ratio Calculator

Last updated: 2026-08-24

Contrast Ratio Calculator — Free online contrast ratio calculator. Enter light luminance and dark luminance to get instant results.
Inputs
Result
Enter values and press Calculate

How to use it

  1. Identify The values of input
  2. Apply The formula correspondiente
  3. Realizar The calculation
  4. Obtain The 2 results

Common mistakes

  • ⚠️ Not Verify The units of input
  • ⚠️ Redondear results intermediums
  • ⚠️ Not Verify The rango of validez

Worked example

Example of calculation

Result of the calculation relacion contraste.