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Ratio calculator

Solve A : B = C : ?, simplify a ratio to its smallest whole numbers, or split an amount in a ratio.

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D 1,080

How it works

A : B = C : D → D = C × B ÷ A

A ratio compares two amounts: 16 : 9 means 16 parts of one for every 9 of the other. Two ratios are equal when you can multiply both sides of one by the same number to get the other, so to solve A : B = C : ? you find how much A was scaled (C ÷ A) and scale B the same way. To simplify, divide both sides by their greatest common divisor. To split, add the parts and give each its share of the total.

  1. How much A was scaled 1,920 ÷ 16 = 120
  2. Scale B the same way 9 × 120 = 1,080

Printed from rocketcalc.io/math/ratio