Ratio Calculator

Enter two numbers to get the ratio in lowest terms. You see the simplified result and the greatest common divisor used.

What is a ratio?

A ratio compares two quantities. Simplifying divides both numbers by their greatest common divisor (GCD) so the ratio stays the same in whole numbers.

Formula:a : b = (a ÷ GCD) : (b ÷ GCD)

  • Arithmetic and algebra
  • Scaling and measurement
  • Everyday use (recipes, maps, mixes)