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Percentage Increase Calculator

Enter the old number and the new one. The percent, including a drop, updates as you type.

Calculator mode

Paste plain numbers or US currency, such as $1,850.

Increase

25%

Up 1 from the start.

((5 − 4) ÷ 4) × 100 = 25%

The formula

Percentage increase compares a new number with the number you started from. Divide the change by the starting value, then multiply by 100:

((new − original) ÷ original) × 100

If the result is negative, the value fell. This page labels that result as a decrease rather than hiding the sign. Adding a percent, and reversing a percent, use the two other modes above. Comparing two numbers that have no before-and-after order is a different question, answered on the percentage difference page.

Examples you can reopen

A starting value of 0 cannot produce a percent change, because you would be dividing by zero. The result is undefined. The same is true when you try to reverse a change of exactly −100%.

Questions people ask

How do you calculate a percentage increase?

Subtract the starting value from the new value, divide by the starting value, and multiply by 100. A move from 4 to 5 is (5 − 4) / 4 × 100, which is a 25% increase.

What if the number went down?

Use the same formula. A negative result is a decrease, and this calculator labels it that way. From 5 to 4 the change is −20%.

What happens when the starting value is 0?

The percentage is undefined, because the formula divides by the starting value. You will see the word undefined, not a blank result or an infinity symbol.

Can the result be more than 100%?

Yes. Doubling a number is a 100% increase. Going from 100 to 250 is a 150% increase. A 100% decrease means the new value is 0.

How do I add a percent, or undo one?

To add 5% to $1,850, multiply by 1.05, which is $1,942.50. To undo a 30% increase that landed on 13, divide 13 by 1.30, which returns 10. A change of exactly −100% has no single original value.

Do you store what I type?

No. The math runs in your browser. The numbers are not sent to a server to be calculated, and you do not need an account.

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