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Ratio calculator

Solve a missing term in a proportion, simplify a ratio, or scale both terms.

Get started

  1. Use the example values or enter your own measurements.
  2. Calculate, then copy the result or download the available details.

Example

Input

3:4 = x:20

Expected result

x=15

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

A:B = C:D implies A×D = B×C, with nonzero denominators. Simplification accepts decimal and fractional quantities.

Calculation mode

Solve a proportion
  • A
  • B
  • C
  • D
Simplify or scale
  • First term
  • Second term
  • Scale factor
Enlarge or reduce a ratio
  • First term
  • Second term
  • Direction · Reduce / Enlarge
  • Factor