Convert 3 : 2 into percentages
Add the parts: 3 + 2 = 5. The first share is 3 ÷ 5 × 100 = 60%. The second share is 2 ÷ 5 × 100 = 40%. Together they describe the whole.
Ratio to Percentage Calculator
Turn a ratio into each part’s percentage of the whole. Enter two parts, or add a third part for a three-way split.
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Convert your ratio to percentages
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How to use this calculator
Convert a three-part ratio
For 2 : 3 : 5, the total is 10 parts. The percentages are 20%, 30% and 50%. You can use the same method for project allocations or agreed shares.
Part-to-part versus part-to-whole
The ratio 3 : 2 gives shares of 60% and 40% of the combined total. Asking what percentage 3 is of 2 gives a different answer: 150%. This tool calculates shares of the combined total.
Decimals and rounding
Decimal inputs work: 0.5 : 1.5 gives 25% and 75%. Results display up to six decimal places. Three equal shares each display 33.333333%, so the rounded values may not sum to exactly 100%.
Your calculations run in your browser. Entered numbers are not uploaded or saved by this tool. Changing an input clears the previous result; select Calculate to update it.
About this calculator
Created by Marchelle Cook at Roof & Ratio. Use the worked examples to check the method. If an answer seems incorrect, send us a calculation question or correction.
Guide updated October 16, 2026.