Ratio Calculator
Solve proportions and simplify ratios. The result updates as you type, with the working underneath so you can check it.
Your details
Result
D
12
3 : 4 = 9 : 12
- Simplest form of A:B
- 3:4
Good to know: A ÷ B = C ÷ D
About this tool
Formula
A ÷ B = C ÷ D
Questions people ask
How do I scale a ratio?
Multiply both sides by the same number. 3:4 scaled to 9 on the first side is 9:12.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it.
Spotted a mistake? Tell us and we'll check it. How we check our calculators