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Ratio calculator

Simplify two ratio parts and scale either side to a target while preserving an exact relationship.

Ratio relationship16 : 9
First 64%Second 36%

16 : 9 = 1920 : 1080

Exact scale factor × 120

Processed on your device

How it works & useful details

How it works & limits

Enter positive integer parts and a target of up to 30 digits. The ratio reduces by the greatest common divisor; the other scaled part stays a fraction when it is not an integer. Ratios, scaled values, and scale factors are exact. Share percentages are rounded approximations.

Your working space

Change the values to explore the preview. Use the action below to create a copyable, downloadable result. All calculations stay on this device; refreshing clears your work.