Calculators
Ratio Calculator
Simplify a ratio to its lowest terms and solve for a missing value in an equivalent ratio.
Enter two non-zero terms to simplify the ratio.
Simplifying a ratio
A ratio is simplified by dividing both sides by their greatest common divisor (GCD). For example, 8 : 12 has a GCD of 4, so it simplifies to 2 : 3.
Solving equivalent ratios
To find a missing value in A : B = C : D, cross-multiply. If you know three of the four values, the fourth is found by (B × C) ÷ A or the equivalent arrangement.
Frequently Asked Questions
It means reducing both numbers to the smallest whole numbers that keep the same proportion, by dividing them by their greatest common divisor.