Ratio calculator
Solve A : B = C : D, simplify ratios, and share an amount
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How to use it
- Enter your numbers.
- The result updates as you type.
- Change any value to see a different outcome.
Questions
How do I solve a proportion?
Cross-multiply. For 2 : 3 = 10 : x, 2 × x = 3 × 10, so x = 15.
Is anything I enter stored?
No. Calculations happen in your browser and nothing you type is sent or saved.
Is it free?
Yes, you can use it for free. A subscription removes limits and unlocks premium tools.