Percentage Calculator
Percent of a number, what percent X is of Y, percentage change, and percent increase or decrease. Results update as you type.
How to Calculate Percentages Online
Four everyday percentage problems, solved the moment you type.
Pick a Mode
Choose Percent Of, What Percent, Percentage Change, or Increase / Decrease depending on the question you have.
Enter Your Numbers
Type the two values - for example 20 and 150 to find what 20% of 150 is. Decimals and negatives work too.
Read the Answer
The result updates instantly as you type, with the formula shown so you can check the math yourself.
Copy the Result
One click copies the answer to your clipboard, ready for a spreadsheet, invoice, or homework sheet.
Why Use This Percentage Calculator?
Discounts, tips, taxes, and grade math without reaching for a formula sheet.
Discounts & Tips
A 25% discount on a $80 jacket or an 18% tip on a $46 dinner - type the numbers and the answer is there.
Growth & Change
Track price moves, traffic growth, or score improvements with the Percentage Change mode: ((new - old) / old) x 100.
Formulas Shown
Every result comes with the exact formula used, so you learn the method instead of just copying an answer.
Fully Private
All math runs in your browser. No number you enter is ever sent to a server.
Frequently Asked Questions
Use the Percent Of mode: enter 20 in the percent field and 150 in the value field. The answer, 30, appears instantly. The formula is (20 / 100) x 150 = 30.
Use the What Percent mode: enter 45 and 180. The result is 25%, because (45 / 180) x 100 = 25.
Percentage change = ((new value - old value) / old value) x 100. A price rising from 80 to 100 is a 25% increase: ((100 - 80) / 80) x 100 = 25.
No. All calculations run locally in your browser. Nothing you type ever leaves your device.