Percent Calculator
Free percent calculator. Work out what percent one number is of another, or find a percent of any value, instantly with the formula and step-by-step explanation.
Percent
—
The part expressed as a percent of the whole. Both numbers must be provided.
What is a percent calculator?
A percent calculator works out the relationship between two numbers as a percent. The most common question it answers is: what percent is the part of the whole? For example, if 30 out of 120 students passed an exam, the percent calculator tells you that 25% passed.
The core formula is (part / whole) × 100. The result is a share expressed out of 100, which makes it easy to compare values of very different sizes. A percent calculator applies this formula instantly and removes the risk of arithmetic slips, especially with decimals or large numbers.
Percent calculations are everywhere: discounts, test scores, tax rates, battery life, survey results. A reliable percent calculator lets you move between fractions, decimals, and percents without reaching for a spreadsheet, so you can answer everyday questions in seconds.
How to calculate a percent
- 1
Enter the part
Type the number that represents the share you want to measure, such as the number of items, points scored, or students who passed.
- 2
Enter the whole
Type the total or reference value the part is being compared against, such as total items, maximum points, or all students.
- 3
Read the percent
The calculator applies (part / whole) × 100 and shows the percent, so you can compare the share across different totals.
Why use this percent calculator?
Instant and accurate
No mental arithmetic or spreadsheet formulas. Get the exact percent the moment both numbers are entered.
Works for any values
Test scores, discounts, survey results, tax, tips — any pair of numbers where one is a share of the other. Decimals are supported.
Transparent method
Every result is built on the same simple formula, so you can verify the math and reuse it for future problems.
FAQ
Frequently Asked Questions
Quick answers to common questions about percentage calculations.
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