Ratio to Percent Calculator

Convert a ratio into percentage shares so you can see each part as a proportion of the whole.

Share this calculator

Convert a ratio (A:B) into percentage values for each part. Enter two positive numbers to see the percentage split.

Enter valid values Provide two positive numbers for A and B to convert a ratio to percentages.

Also in Ratios & Averages

Average Calculator Decimal to Ratio Calculator Fraction to Ratio Calculator Golden Ratio Calculator Proportion Calculator Ratio Calculator Ratio Simplifier Ratio to Decimal Calculator Ratio to Fraction Calculator Simplify Ratio Calculator Weighted Average Calculator Winning Percentage Calculator

Ratio & Percentage Tools

Ratio to percent calculator: express each ratio part as a percentage

A ratio to percent calculator converts a ratio into percentage shares, showing what proportion of the total each part represents. This is useful whenever you need to communicate a ratio in percentage terms, such as vote shares, portfolio allocations, ingredient proportions, or survey results.

How the conversion works

To convert a ratio A:B to percentages, first find the total: A + B. Then divide each part by the total and multiply by 100. For a ratio of 3:2, the total is 5. The first part is 3/5 x 100 = 60%, and the second is 2/5 x 100 = 40%. The percentages always sum to 100%.

The same method extends to ratios with three or more parts. A ratio of 1:2:2 has a total of 5, giving 20%, 40%, and 40%.

Part % = (Part / Sum of all parts) x 100

Each part of the ratio as a percentage of the total.

Reading percentage shares

Percentage shares make ratios easier to compare across different totals. A fundraising split of 7:3 means 70% goes to one cause and 30% to another, regardless of the total raised. Expressing the ratio as percentages strips away the absolute scale and highlights the proportional relationship.

Frequently asked questions

Do the percentages always add up to 100%?

Yes. Since each percentage is calculated as a share of the total, they must sum to exactly 100%. Rounding may cause tiny discrepancies in display, but the underlying values are exact.

 How do I go from percentages back to a ratio?

Write each percentage as a number, then simplify by dividing all values by their greatest common divisor. For 60% and 40%, write 60:40, then divide by 20 to get 3:2.

Related

More from nearby categories

These related calculators come from the same leaf category, nearby sibling categories, or the same top-level topic.

Ratio Calculator

Simplify any ratio to its lowest terms, convert to a fraction or decimal, and find the percentage split.

Open calculator

Ratio to Fraction Calculator

Convert any ratio such as 3:4 into its equivalent fraction and simplify to lowest terms.

Open calculator

Simplify Ratio Calculator

Reduce any ratio to its simplest form by dividing both sides by the greatest common divisor.

Open calculator

Decimal to Percent Calculator

Convert any decimal number to a percentage and see the working, or reverse-convert a percentage back to a decimal.

Open calculator

Privacy choices

If you allow analytics, we may use Google Analytics and Microsoft Clarity to better understand how the site is used. Analytics remain off unless you accept.