1. What is X% of Y?
2. X is what percent of Y?
3. Percentage change from X to Y
4. Increase a number by X%
5. Decrease a number by X%
6. X is Y% of what number?
Type in any box. The answer changes at once.
How to Calculate Percentages
Pick the box that matches your question and type your numbers.
- Find the box that matches your question, for example "What is X% of Y?"
- Type your numbers in the boxes
- The answer shows at once below, with the working
- Change the numbers any time to try again
Everything happens inside your browser, so your document is never uploaded.
Why Use This Tool?
Percentages are needed for discounts, marks, interest, price changes, election and survey figures. Doing them by hand takes time and mistakes are easy.
Here you get six common calculations on one page, with the working shown so you can check the answer.
Features
- X% of a number
- What percent one number is of another
- Percentage increase or decrease between two numbers
- Increase or decrease a number by a percent
- Find the full number when a percent of it is known
- Working shown with every answer
- Answers update as you type
Frequently Asked Questions
How do I find 20% of 500?
Multiply 500 by 20 and divide by 100. The answer is 100.
How is percentage change worked out?
Subtract the old number from the new number, divide by the old number and multiply by 100.
What is the difference between percent and percentage points?
If a rate goes from 10% to 12%, it rises by 2 percentage points, which is a 20% increase.
Can I use decimals and negative numbers?
Yes. Decimals work in all boxes.
Is my data saved?
No. Everything is calculated in your browser.
Is it free?
Yes, completely free.
About This Tool
A simple percentage calculator for students, shop owners, journalists and anyone who works with numbers.
It works in your browser and stores nothing.