Ratio Calculator
Simplify ratios and solve for missing values in proportions.
✅ 100% Free
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⚡ Instant Results
What is a Ratio Calculator?
A ratio calculator simplifies ratios and solves for an unknown value in a proportion.
How to Use This Ratio Calculator
- Enter A and B to simplify the ratio, or
- Enter A, B, and C to solve A:B = C:D.
- Click Calculate.
How It Works
Divide both terms by their GCD to simplify. For A:B = C:D, solve D = B × C / A.
Example Calculation
Ratio 8:12 simplifies to 2:3. If 2:3 = 10:D, then D = 15.
Frequently Asked Questions
How do I simplify a ratio?
Divide both terms by their greatest common divisor.
Privacy & Data Processing
All calculations run in your browser.
Last updated: 2026-10-01