Simplify
Divide by GCD 10
Input
10:20
Output
1:2
Calculators & Converters
Ratio Calculator
Simplify a ratio to lowest terms or solve A:B = C:X for the missing value using exact arithmetic where practical.
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How to Use the Ratio Calculator
Step 1
Choose a mode
Provide the values or units for this calculation.
Step 2
Enter ratio terms
The result updates as you change inputs.
Step 3
Review the answer
Copy the result or reset to start again.
Ratio Modes
- Simplify ratios with GCD
- Solve missing-value ratios
- Exact integer simplification
- Clear mode separation
- Copy results
Supported Calculations
Input formats
- Ratio terms
Output formats
- Simplified ratios
- Missing values
Supported formats
- Ratios
Examples
Solve missing value
x = (3 × 10) ÷ 2
Input
2:3 = 10:x
Output
x = 15
Frequently Asked Questions
How is 10:20 simplified?
Divide both terms by 10 to get 1:2.
How do I solve 2:3 = 10:x?
X = (3 × 10) ÷ 2 = 15.
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