Percentage Calculator

Calculate what a percentage of a number is, what percent one number is of another, or the percentage increase or decrease between two values. Three calculators in one, all computed instantly in your browser.

X% of Y

Percentage (%)

Of Number

X is what % of Y

Part

Total

Percentage Change

From

How was this tool?

Your feedback helps us improve Percentage Calculator.

Why use Percentage Calculator?

This calculator covers the three percentage calculations people search for most often: finding a percentage of a number, finding what percent one number is of another, and finding the percentage change between two values. All three run independently, so you can use whichever section fits your calculation.

Key benefits

Three common percentage calculations in one tool
Results update instantly as you type
No signup, no ads blocking the calculator
Works for any positive or negative numbers

Features

Percentage-of-a-number calculator
"What percent is X of Y" calculator
Percentage increase/decrease calculator

Popular use cases

Calculating a discount, tax, or tip percentage
Finding what percent a test score or metric represents
Measuring percentage growth or decline between two periods

How to use Percentage Calculator

1
Pick a calculation
Use the "X% of Y" section, the "X is what % of Y" section, or the Percentage Change section depending on what you need.
2
Enter your numbers
Fill in the two values for the calculation you chose.
3
Read the result
The answer appears automatically as you type.

Frequently asked questions

How do I calculate X% of Y?

Use the first calculator: enter the percentage and the number, and the result is calculated as (percentage ÷ 100) × number.

How is percentage change calculated?

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

Can I use negative numbers?

Yes, all three calculators accept negative numbers where mathematically valid.

Is this tool free?

Yes, completely free with no limits.

Last reviewed: July 2026

X% of Y

X is what % of Y

Percentage Change

How was this tool?

Related tools