Percentage Calculator
Three ways to work with percentages, all in one place. Just fill in the blanks.
What is ___% of ___?
Result
—
No data saved or tracked
What do these words mean?
X% of a number
Means: take X percent of that number. You convert the percentage to a decimal by dividing by 100, then multiply. This shows up every day in discounts, tax, and tips.
20% of 150. Do 20 ÷ 100 = 0.20, then 0.20 × 150 = 30. Answer: 30.
Percentage increase / decrease
Shows how much a value went up or down compared to where it started. A positive result is an increase. A negative one is a decrease.
Price goes $40 → $50: (50 − 40) ÷ 40 × 100 = 25% increase. Goes $60 → $54: (54 − 60) ÷ 60 × 100 = 10% decrease.
What percent is X of Y?
Finds how X relates to Y as a percentage. You divide X by Y and multiply by 100. Useful for test scores, budget usage, or any part-to-whole comparison.
15 is what % of 60? Do (15 ÷ 60) × 100 = 25%. Answer: 15 is 25% of 60.
Common Questions.
It means: take X percent of that number. You convert the percentage to a decimal and multiply.
For example, 20% of 150. You do 20 ÷ 100 = 0.20, then 0.20 × 150 = 30. That's it.
This one comes up all the time. Discounts, tax, tips, interest. They all work this way.
Divide the first number by the second, then multiply by 100.
Example: 15 is what percent of 60?
(15 ÷ 60) × 100 = 25%
Useful when you want to know how you scored on a test, how much of a budget you used, or how a part compares to the whole.
It shows how much a value changed compared to what it was before.
Formula: (New value − Old value) ÷ Old value × 100
Example: price goes from $40 to $50.
(50 − 40) ÷ 40 × 100 = 25% increase
If the result is negative, it's a decrease. Our calculator shows ▲ for increase and ▼ for decrease so you always know which way it went.
Yes, for percentage change you can. A negative original value still works fine.
Just keep in mind that zero can't be the original value in a percentage change calculation. Dividing by zero has no meaningful answer, so we'll show an error if you try.
Results are rounded to up to 2 decimal places, and trailing zeros are removed.
So 25.00 shows as 25. And 33.3333 shows as 33.33. Clean and easy to read.
When this toggle is on, the result updates automatically as you type. No need to press a button.
When it's off, you press the Calculate button when you're ready. The result stays on screen while you edit, so you don't lose your last answer.
We turn it on by default because it's faster for most people.
Yes, 100% free. Everything runs in your browser.
We don't save, share, or track anything you type. Your numbers never leave your device.
Percentages show up everywhere. Sale prices, exam results, interest rates, tax, tips, salary changes.
They give you a fair way to compare things even when the original numbers are very different. A 20% discount on a $10 item and a $1,000 item are very different amounts, but the same percentage.