Math calculator
Ratio Calculator
Simplify a ratio to lowest whole-number terms or solve one missing value in an equivalent ratio.
Enter at least two positive whole numbers, separated by colons, commas, or spaces.
Simplified ratio
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How it works
Simplification divides every positive whole-number term by their greatest common factor. Equivalent-ratio mode instead solves a proportion with one unknown using cross multiplication.
Worked example
For 8:12, the greatest common factor is 4, so 8 ÷ 4 : 12 ÷ 4 = 2:3.
How to use this tool
- Enter the known values and choose units where available.
- Check the primary result and supporting details.
- Clear or replace an input to calculate another case.
Frequently asked questions
What happens with invalid or incomplete inputs?
The result remains blank until the required inputs form a finite, meaningful calculation. Zero denominators and physically impossible negative quantities are not calculated.
Can I use decimal values?
Yes. The tool accepts decimals and keeps full precision for the calculation while rounding the displayed result for readability.