Ratio Calculator
Solve A:B = C:D for a missing value, simplify ratios to lowest terms, and scale them up or down.
- Runs in your browser
- No upload on server
- Free, forever
- Enter values
- See result
- Copy or share
Result
D = 15
Handles whole numbers and decimals.
How this works — and why it's private
- Pick Solve, Simplify or Scale.
- Enter your numbers — leave one blank in Solve mode.
- Copy the answer with one tap.
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