Percentage calculator

All percentage calculations in one place.

What is X% of a number?

Example: what is 15% of 200? → 30

% of

X is what percentage of Y?

Example: 30 is what % of 200? → 15%

By what percentage did the value change?

Example: change from 100 to 150 → increase of 50%

Value before

Value after

Add or subtract a percentage from a number

Example: 200 + 15% = 230 or 200 - 15% = 170

What number after a change by X% gives the result Y?

Example: what number after +15% gives 230? → 200

% gives

How to calculate percentages? Below we provide formulas for percentage operations.

Percent means one hundredth part of a given value. For example, 10% means 10 out of 100. Percentage calculations are often used in finance, statistics, trade, and data analysis.

How to calculate X% of a number?

To calculate a percentage of a number, multiply the value by the percentage and divide by 100.

result = number × percentage ÷ 100

Example: 15% of 200 is 30 because 200 × 15 ÷ 100 = 30.

How to calculate what percentage a number represents?

To check what percentage of one number another is, divide the first by the second and multiply by 100.

percentage = (part ÷ whole) × 100

Example: 30 of 200 is 15%.

How to calculate percentage change?

Percentage change shows by what percentage a value has increased or decreased.

change = (new − old) ÷ old × 100

Example: an increase from 100 to 150 means a 50% increase.

Where are percentages used?

Percentages are commonly used in many areas of life and business.

calculating discounts and promotions
analysis of price increases and decreases
statistics and data analysis
finance and investments
taxes and VAT

Most common percentage calculations

In everyday situations, percentages appear very often — when calculating discounts, taxes, salary increases, or price changes. Below you will find the most popular types of percentage calculations along with examples.

How much is X% of a number?

This is the simplest and most common type of percentage calculation.

result = number × percentage / 100

Example: how much is 20% of 150?

150 × 20 / 100 = 30

By what percentage did the value increase or decrease?

This type of calculation is used to compare changes in value — e.g., product price, salary, or number of users.

percentage change = (new value − old value) / old value × 100

Example: price increased from 200 PLN to 250 PLN.

(250 − 200) / 200 × 100 = 25%%

How to calculate a percentage discount?

A percentage discount means reducing the price by a specific percentage.

price after discount = price × (1 − percentage / 100)

Example: product costs 120 PLN, discount is 15%.

120 × (1 − 0.15) = 102 zł

How to calculate VAT from a price?

VAT tax is one of the most frequently calculated percentages in business and accounting.

VAT = net price × VAT rate / 100

Example: net price 100 PLN, VAT 23%.

100 × 23 / 100 = 23 zł VAT