Ratio Calculator
Solve and scale ratios, and reduce them to simplest form.
Enter values
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Step by step
The formula
B₂ = (B / A) × A₂
A ratio compares two quantities by division, so scaling one side means multiplying both by the same factor. Reducing by the greatest common divisor gives the simplest equivalent form — 1920:1080 and 16:9 describe exactly the same shape.
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Example calculations
Common questions this calculator answers — select one to load its values.
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Frequently asked questions
How do I scale a ratio?+
Multiply both sides by the same factor. To keep 16:9 while making the first term 1920, multiply by 120.
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