Ratio Calculator
Ratios compare quantities. Enter a ratio such as 12:8 to simplify it, scale it up to equivalent ratios, or solve proportion problems like "2:5 = 8:?".
Simplified ratio
3 : 2
Equivalent ratio (×3)
9 : 6
As a fraction
3/2
As a percentage
150%
As a decimal
1.5 : 1
How this was worked out
- Step 1Greatest common divisor of 12 and 8 = 4
- Step 212 ÷ 4 = 3
- Step 38 ÷ 4 = 2
Formula
Simplified ratio = (A ÷ GCD) : (B ÷ GCD)
Example
Input
12 : 8
Result
3 : 2
Frequently asked questions
Divide both sides by their greatest common divisor. 12:8 shares a divisor of 4, giving 3:2.
For every 3 units of the first quantity there are 2 of the second — 5 parts in total.
Divide the first number by the second and multiply by 100.
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