Ratio Calculator
Simplify ratios, find equivalent ratios, and solve ratio proportions. Enter any ratio to reduce it to its simplest form.
Part of our Math & Percentage Calculators collection.
Ratio Calculator
Free online calculator
How to Use This Calculator
- 1
Enter the two numbers in the ratio (A and B).
- 2
Choose 'Simplify' to reduce to lowest terms.
- 3
Choose 'Find equivalent' to scale the ratio.
Ratio Simplification
Simplified Ratio = A/GCD : B/GCD GCD = Greatest Common Divisor (found using Euclidean algorithm) Example: 12:8 → GCD(12,8)=4 → 12/4 : 8/4 = 3:2
Example Calculation
Example: Simplify 12:8
Inputs
a: 12b: 8calcMode: simplify
Result
3:2
GCD of 12 and 8 is 4. 12÷4=3, 8÷4=2. Simplified ratio = 3:2.
Frequently Asked Questions
What is the ratio of 3 to 5?
3:5 is already in simplest form since GCD(3,5)=1. It means for every 3 of one thing, there are 5 of another.