Percentage Calculator

Three common percentage calculations in one tool: find a percentage of a number, find what percent one number is of another, and calculate percentage increase or decrease.

1. What is % of ?

is what percent of ?

Percentage change from to

How to Use This Tool

Pick the calculation that matches your question (percentage of a number, one number as a percent of another, or percentage change).
Fill in the two numbers required.
Click Calculate to see the instant result.

Common Uses for Percentage Calculations

Percentage calculations show up everywhere: figuring out a discount at checkout, calculating a tip, working out exam scores, tracking sales growth month over month, or understanding interest rates. This tool covers the three most commonly searched percentage formulas so you don't have to remember them yourself.

Frequently Asked Questions

How do I calculate a percentage increase?

Use the third calculator above: enter your old value and new value, and it will show the percentage increase (positive) or decrease (negative).

What's the formula behind "X is what percent of Y"?

The formula is (X ÷ Y) × 100.