Ratio to Percentage
Convert a ratio to a percentage. Example: 3:5 = 60%.
Calculator
Try an example
How it works
A ratio a:b means a parts out of (a+b) total parts when expressing a as a share of the whole, or a/b when comparing a to b. This calculator treats the ratio as a:b → (a ÷ b) × 100 for “a is what percent of b”, and also shows a’s share of a+b.
Frequently asked questions
How do I use the Ratio to Percentage?
Enter the required values in the form. The result updates live as you type. You can adjust decimal precision, copy the answer, or share a link with your inputs pre-filled.
Can a percentage be greater than 100%?
Yes. Percentages above 100% mean the part is larger than the whole — for example, 150% of 80 is 120. Growth, markup, and error calculations often exceed 100%.
Why is my answer a decimal?
Many percentage calculations produce fractional results (for example, 15% of 250 is 37.5). Use the precision selector to control how many decimal places are shown.
Related calculators
Recent calculations
Stored only on this device.