Percentage Calculator

What is X% of a number?

Percent

% of

Number

Result

X is what percent of a number?

Number

is what % of

Total

Result

Percentage increase / decrease

From

Change

What is the Percentage Calculator?

The Percentage Calculator helps with the percentage questions that appear in shopping, invoices, schoolwork, reports, and business planning. It can find a percentage of a number, work out what percent one number is of another, and calculate percentage increase or decrease.

The basic formula is simple: percentage value equals part divided by whole, then multiplied by 100. For example, if 25 out of 200 orders are returned, the return rate is 25 divided by 200 times 100, which equals 12.5%.

Use it when you need a fast answer and a clear way to check the math behind discounts, tax, growth, conversion rates, grade scores, or performance changes.

How to use the Percentage Calculator

Choose the percentage question that matches your task.
Enter the known numbers, such as the part, whole, original value, new value, or percent rate.
Read the result and compare it with the formula shown on the page.
For discounts and taxes, double-check whether the percentage should be added, removed, or compared against the original amount.

Frequently asked questions

The most common formula is part divided by whole times 100. Percentage change uses new value minus old value, divided by old value, then multiplied by 100.

Yes. Enter the original price and discount rate to estimate the savings and final price.

Percentage increase compares change against the original value. Percentage difference compares two values against their average, which is useful for neutral comparisons.