Ratio Calculator

Simplify any two-number ratio, compare each value as a percentage and see the result instantly. Free ratio calculator; no sign-up required.

How to use Ratio Calculator

Simplify ratios, compare percentages, solve A:B = C:X proportions and scale values instantly in your browser.

  1. Enter the requested values in the relevant fields.
  2. Check the units and calculation options.
  3. Compare the result with the assumptions in your scenario.

Inputs are processed in your browser unless the tool explicitly states that it retrieves reference data. Verify the result against your own context before making an important decision.

Worked ratio example

To simplify 1920:1080, divide both values by their common divisor, 120. The result is 16:9. The same inputs represent about 64% and 36% of their combined total.

For a missing value in A:B = C:X, use cross multiplication. In 4:5 = 20:X, X is 25. Keep units consistent when scaling recipes, dimensions, prices or map distances.