How is percent change calculated?

As (new − old) ÷ old × 100. A positive result is an increase; a negative one is a decrease.

Can it handle decimals?

Yes, you can enter decimal values in any field.

What if the base is zero?

Percent-of-total and percent-change need a non-zero base, so those results stay hidden until the base is valid.

No. Calculations run locally and nothing is saved or sent.

Percentage Calculator

Everyday

Three everyday percentage calculations in one tool: find X% of a value, work out what percent one number is of another, and calculate the percent increase or decrease between two numbers. Results update as you type, all in your browser.

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What is X% of a value?

Percent (%)Value

X is what percent of Y?

PartWhole

Percent change from X to Y

FromTo

How to use

Pick the calculation you need.
Enter the two numbers.
The result updates instantly.
Combine them for tips, discounts, taxes, and more.

Frequently asked questions

How is percent change calculated?: As (new − old) ÷ old × 100. A positive result is an increase; a negative one is a decrease.
Can it handle decimals?: Yes, you can enter decimal values in any field.
What if the base is zero?: Percent-of-total and percent-change need a non-zero base, so those results stay hidden until the base is valid.
Is anything stored?: No. Calculations run locally and nothing is saved or sent.