Ratio Calculator

Simplify ratios, find equivalent ratios, and solve for a missing value in a proportion. Enter values A:B and a third value C to find D in the proportion A:B = C:D.

Frequently asked questions

How do I simplify a ratio?

Divide both numbers by their Greatest Common Divisor (GCD). For example, 12:8 simplifies to 3:2 because GCD(12,8) = 4.

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