Ratio Calculator

Simplify ratios and check whether two ratios are equivalent using a simple, easy-to-follow calculation.

Calculate and simplify a ratio

Enter two values for the first ratio. You can also enter a second ratio to check whether the ratios are equivalent.

First number

Second number

Compare another ratio (optional)

Simplified Ratio

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A ratio compares two quantities. To simplify a ratio, divide both values by their greatest common divisor when working with whole numbers.

Simplified ratio = A ÷ GCD : B ÷ GCD

Enter the two values Enter the two quantities you want to compare.

Find the common divisor Find the greatest number that divides both values evenly.

Divide both values Divide each value by the greatest common divisor to produce the simplest ratio.

Suppose you want to simplify the ratio 12:18.

Original ratio 12 : 18

Greatest common divisor 6

First number 12 ÷ 6 = 2

Second number 18 ÷ 6 = 3

Simplified ratio 2 : 3

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Note: This calculator is intended for general mathematical calculations. Make sure the values you enter are appropriate for your intended use.