What Percent Is X of Y Calculator
Find what percentage one number is of another — the calculation behind test scores, market share and any 'X out of Y' figure.
The formula
percentage = part ÷ whole × 100
45 out of 180 is 25%. The order matters: it is always the part divided by the whole, never the other way round. If the answer comes out above 100%, either the part really is larger than the whole or the two numbers are the wrong way around.
How to use the What Percent Is X of Y Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
What Percent Is X of Y Calculator — frequently asked questions
How do I turn a test score into a percentage?
Divide the marks you scored by the marks available and multiply by 100. 45 out of 180 is 25%.
Is this what percent is x of y calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
This page is a focused version of the Percentage Calculator, which handles every variation in one place.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the what percent is x of y calculator.
- work out percentage
About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error