Percentage Calculator
Work out percentages three ways: a percent of a number, what percent one number is of another, and percentage increase or decrease.
What is X% of Y?
30
15% of 200
X is what percent of Y?
15%
30 out of 200
Percentage increase or decrease
+25%
Increase from 200 to 250
How to use the Percentage Calculator
- Pick the question. Three calculators cover the three things people mean by percentage.
- Fill in the numbers. Answers update as you type, with the working shown underneath.
Frequently asked questions
- What is the difference between percentage points and percent?
- Going from 10 percent to 12 percent is a rise of two percentage points, but a 20 percent increase. Confusing the two is one of the most common errors in reporting figures.
- Why is a 50 percent rise not cancelled by a 50 percent fall?
- Because each is applied to a different base. One hundred rises by half to 150, and half of 150 is 75, not 100. Percentage changes compound rather than simply adding up.
- How do I calculate a percentage decrease?
- Subtract the new value from the old one, divide by the old value, then multiply by 100. A negative result from the change calculator here means the value went down.
- How do I remove a percentage that was already added?
- Divide rather than subtract. To strip 20 percent tax from a gross figure, divide by 1.2. Subtracting 20 percent of the gross gives a different and incorrect answer.
Learn more
- 2 min read
How to Find the Original Price Before a Discount
Divide, do not multiply. Why adding the percentage back gives the wrong answer, the formula that works, and how to check a sale price is what it claims.
- 3 min read
Percentage Points Are Not Percent
A rate going from 2% to 3% rose by one percentage point and by fifty percent. Both are true, and confusing them is how numbers get misreported.
- 2 min read
How to Calculate Percentage Change
One formula, and three places people get it wrong: which number goes on the bottom, why increases and decreases are not symmetric, and points versus percent.
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