Percentage Calculator
Work out percentages four ways: percent of a number, what percent, percentage change, and adding or removing a percent.
Discounts, exam marks, salary rises, tax and growth figures all come down to a few percentage questions. Type your numbers into the matching card and the answer appears as you type, with a one tap copy.
How to use the Percentage Calculator
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Pick the right question
Choose the card that matches what you want to know, such as percent of a number or percentage change.
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Type your numbers
Enter the two values. Decimals and negative numbers work.
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Read and copy
The answer appears instantly in plain words. Tap the copy button to use it elsewhere.
Features
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Four calculators in one
Percent of a number, what percent, percentage change and add or subtract a percent.
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Answers in words
Results read like a sentence, so it is clear what the number means.
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Increase or decrease
Percentage change tells you whether the value went up or down.
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Both directions at once
Add and subtract a percent in one go, handy for prices with and without tax.
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Instant results
No calculate button, the answer updates as you type.
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Works offline
Once loaded, the calculator keeps working without a connection.
When to use it
Shopping discounts
Find the price after a 25 percent sale, or how big a discount really is.
Marks and grades
Turn 45 out of 60 into a percentage in a second.
Salary and prices
See the percentage rise between your old and new pay, or how much a price went up.
Tax and tips
Add sales tax or a service charge to a bill.
The formulas behind each card
Percent of a number: X% of Y = X divided by 100, times Y. What percent: X is (X divided by Y) times 100 percent of Y. Percentage change: (new minus old) divided by old, times 100. Add a percent: Y times (1 + X divided by 100).
Percentage change is not symmetrical
If a price rises 50 percent from 100 to 150, it must fall by 33.3 percent to get back to 100, not 50 percent. That is because the second change is measured from a bigger starting value.
Worked examples
A shirt costs 2,400 and is 30 percent off: use Add or subtract a percent with 2,400 and 30, and read the minus result, 1,680. You scored 52 out of 65: use What percent is it, which gives 80 percent. Your rent went from 40,000 to 46,000: Percentage change shows an increase of 15 percent.
Percentage points are different from percent. If an interest rate rises from 10 percent to 12 percent, it went up by 2 percentage points, which is a 20 percent increase in the rate itself.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 20 percent of 150 is 0.2 times 150, which is 30.
How do I work out percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 45 out of 60 is 75 percent.
How do I calculate a discount?
Use Add or subtract a percent: enter the price and the discount, and read the minus result.
Can I use decimals?
Yes. Decimals and negative numbers both work.
Is my data saved?
No. The calculator runs in your browser and stores nothing.