What Percent Of Calculator
Find what percentage one number is of another — a score out of a total, a share of a budget, a part of a whole.
Divide the part by the whole and multiply by 100.
How the what percent of calculator works
Divide the part by the whole and multiply by 100. The order matters: the number you are asking about goes on top, and the total goes underneath. If the answer is over 100% the "part" is larger than the "whole", which is perfectly valid when comparing a new figure with an old one.
Formula: X% of Y = Y × X / 100; X as % of Y = X / Y × 100; change = (B − A) / A × 100
Worked examples
| Inputs | Answer | Note |
|---|---|---|
| 36 is what percent of 240? | 15% | 15% |
| A score of 42 out of 50 | 84% | 84% |
| 250 out of 200 | 125% | 125% — more than the whole |
FAQFrequently asked questions
How do I find what percent one number is of another?
Divide the first by the second and multiply by 100: 36 ÷ 240 × 100 = 15%.
How do I turn a test score into a percentage?
Divide the marks you got by the marks available: 42 out of 50 is 84%.
Can the answer be more than 100%?
Yes, whenever the part is bigger than the whole — 250 out of 200 is 125%.
Which number goes first?
The one you are asking about. "What percent of 240 is 36" puts 36 on top.
Why does dividing by zero fail?
Because nothing is a percentage of nothing — there is no total to compare against.
Where these figures come from
- NIST Digital Library of Mathematical Functions — reference definitions for elementary and special functions
- Wolfram MathWorld — definitions and formulas for every topic on this page
- NIST/SEMATECH e-Handbook of Statistical Methods — the statistical formulas (mean, variance, z, confidence intervals, sample size)
- Common Core State Standards — Mathematics — the terms and methods taught in US schools
Last checked: September 2026. Formulas are fixed by mathematics and do not change with tax years or regulations.