Percentage Calculator

Percentage Calculator

Choose a calculation

Result

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Enter two numbers to see the result.

Quick Examples

What is 20% of 150?

20 ÷ 100 × 150 = 30

Answer: 30

30 is what percentage of 150?

30 ÷ 150 × 100 = 20%

Answer: 20%

What is the percentage increase from 80 to 100?

(100 − 80) ÷ 80 × 100 = 25%

Answer: 25% increase

How to Calculate Percentages

Find a percentage of a number

Divide the percentage by 100, then multiply by the number.

Formula
(Percentage ÷ 100) × Number
Example
20 ÷ 100 × 150 = 30
Answer
20% of 150 = 30

Find what percentage one number is of another

Divide the part by the whole, then multiply by 100. The whole cannot be zero.

Formula
(Part ÷ Whole) × 100
Example
30 ÷ 150 × 100 = 20%
Answer
30 is 20% of 150

Calculate percentage increase or decrease

Divide the change by the original value, ignoring its sign, then multiply by 100. A negative result is a decrease, so −50 to −25 counts as a 50% increase. The original value cannot be zero.

Formula
((New − Original) ÷ |Original|) × 100
Example
(100 − 80) ÷ 80 × 100 = 25%
Answer
80 to 100 = 25% increase

Percentage Calculator for Marks

You scored 42 out of 50: 42 ÷ 50 × 100 = 84%. Answer: 84%.

Use X is what % of Y? with your marks as X and the maximum marks as Y.

Frequently Asked Questions

What is a percentage?

A percentage is a number expressed as a share of 100. 25% means 25 out of every 100 — the same as 0.25 or one quarter.

How do you calculate a percentage?

Divide the part by the whole and multiply by 100: 30 out of 150 is 20%. The formulas above cover all three common calculations.

Why do percentages matter?

They put numbers of different sizes on the same scale, so you can compare them directly. Discounts, interest rates, test scores and statistics are usually given as percentages.

How do you calculate percentage increase?

Subtract the original value from the new value, divide by the original value (ignoring its sign), then multiply by 100. Going from 80 to 100 is a 25% increase.

How do you calculate percentage decrease?

Use the same formula. The result is negative, which indicates a decrease: going from 100 to 75 gives −25%, a 25% decrease.

How do you find what percentage one number is of another?

Divide the first number by the second and multiply by 100. The calculator's “X is what % of Y?” mode does this for you.

Can a percentage be greater than 100%?

Yes. It means more than the whole: 300 is 200% of 150, and a price that rises from 50 to 150 has increased by 200%.

Your privacy

All calculations run locally in your browser. The calculator sets no cookies, keeps no history, uses no analytics and sends none of your numbers to any server.

Enter numbers with a dot as the decimal separator (for example 12.5), without thousands separators.