Ratio Calculator
Simplify a ratio, scale it to a new size, or solve for a missing value.
Simplify a ratio
—Simplified
—As 1 : x
Shares (A / B)
Solve A : B = C : D (leave one box empty)
—Missing value
—Equation
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How it works
A ratio is simplified by dividing both terms by their greatest common divisor (1920:1080 → 16:9); decimals are scaled to whole numbers first. To solve A:B = C:D, cross-multiply: D = B × C ÷ A.