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Percentage Calculator

Use this free online percentage calculator to quickly calculate percentages, find what percent one number is of another, or determine a value based on a percentage. Fast, simple, and works instantly in your browser.

Enter Values

Part (Value)

The value you want to express as a percentage

Whole (Total)

The total or base value

Result

Enter values above and click Calculate to see your result.

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Formula

Percentage = (Part / Whole) x 100

Divide the part by the whole, then multiply by 100 to convert the ratio into a percentage.

Worked Example

What is 25% of 200? Step 1: Convert 25% to decimal → 25 / 100 = 0.25 Step 2: Multiply by the whole → 0.25 × 200 = 50 Result: 25% of 200 is 50.

What Is a Percentage?

A percentage represents a number as a fraction of 100. The word itself comes from the Latin "per centum," meaning "by the hundred." Percentages are one of the most commonly used mathematical concepts in everyday life, from calculating discounts while shopping to understanding interest rates on loans.

50% means 50 out of 100, or half of a value
25% means 25 out of 100, or one quarter
100% represents the entire value, while 200% means twice the original
Percentages make it easy to compare values of different sizes on the same scale

Percentages are widely used in business, education, finance, and statistics. Whether you are calculating exam scores, tax rates, profit margins, or survey results, understanding percentages is essential for making informed decisions.

You can also calculate changes using our Percentage Increase Calculator, Percentage Decrease Calculator or Percentage Difference Calculator.

Frequently Asked Questions

How do I calculate a percentage?

Divide the part by the whole and multiply by 100. For example, 30 out of 120 = (30/120) × 100 = 25%.

What is the difference between percentage and percentile?

A percentage is a fraction of 100, while a percentile indicates the value below which a given percentage of observations fall in a dataset. For example, scoring in the 90th percentile means you scored higher than 90% of all test takers.

Can a percentage be more than 100%?

Yes. If the part is greater than the whole (e.g. a 150% increase), the percentage exceeds 100%. This commonly happens when measuring growth or change over time.

How do I calculate percentage increase?

Subtract the original value from the new value, divide by the original value, and multiply by 100. For example, if a price goes from 80 to 100: ((100 - 80) / 80) × 100 = 25% increase.

How do I calculate percentage decrease?

Subtract the new value from the original value, divide by the original value, and multiply by 100. For example, if a price drops from 100 to 75: ((100 - 75) / 100) × 100 = 25% decrease.

How do I reverse a percentage calculation?

To find the original value before a percentage was applied, divide the result by the percentage (as a decimal). For example, if 25% of a number is 50, the original number is 50 / 0.25 = 200.

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