Percentage Calculator

Free browser-based tool. Use the controls below to get started.

QUICK GUIDE

Calculate common percentage values

Choose the calculation type and enter the required values. Example: 15% of 200 is 30. For a percentage change from 80 to 100, the increase is 25%.

Choose the percentage calculation type

Follow the fields and controls shown in the tool above.

Enter the requested values

Check the selected settings and input values before continuing.

Read the result and check the example against your use case

Review the output before copying, saving, or sharing it.

Processing behavior depends on the tool and browser. Do not use confidential or sensitive content unless you have confirmed how that specific tool handles it.

Read the full guide

ABOUT THIS TOOL

About the Percentage Calculator

The HandyTools Percentage Calculator covers the percentage questions people ask most often. Find a percentage of a number (15% of 200 is 30), work out what percent one value is of another, calculate the percentage change between an old and a new value, or find the original value before a percentage change.

Choose the type of calculation, enter the values and read the answer. It is useful for discounts, tax, tips, grades, price changes and reports. All calculations run in your browser.

Tips for best results

Percentage change from 80 to 100 is 25%, but the change from 100 back to 80 is 20%, because the starting value differs.
A percentage change from zero is undefined, because there is no original value to compare against.
For a discount, find the percentage of the price and subtract it from the original price.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30.

How do I calculate percentage increase or decrease?

Subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result is an increase and a negative result is a decrease.

How do I find what percent one number is of another?

Divide the first number by the second and multiply by 100.