EVERYDAY MATH • FREE CALCULATOR

Ratio Calculator

Simplify ratios and compare each part as a share of the total, with a step-by-step explanation.

Simplified ratio
2:3
First share
40%

How it works

Divide both integer parts by their greatest common divisor.

Worked calculation

12:18 simplifies to 2:3. For the sample inputs, the calculator displays these results:

Simplified ratio2:3
First share40%

Assumptions and limitations

Requires two nonnegative whole-number quantities, not both zero.

Results update as you change inputs. The values are calculated from the displayed inputs and assumptions, not obtained from an external measurement. Check units, rounding, and any special rules that apply to your situation.

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Frequently asked questions

How is a ratio simplified?

Divide both parts by their greatest common divisor.

How do I find a part's share?

Part ÷ total × 100 gives the percentage.

Can I use decimals?

This tool expects whole numbers.

Sources and further reading

Last updated: . Results are estimates for information only and are not financial, medical or professional advice.