Percentage increase calculator

Percentage Increase Calculator

How to use: Enter the starting value and the new value. You see the percent change and whether it is an increase or a decrease.

How to calculate percentage increase

Subtract the old value from the new value, divide by the old value, then multiply by 100. A positive answer is an increase, and a negative answer is a decrease. This percentage increase calculator does the steps for you.

Example

If a price goes from $80 to $100, the difference is $20, and $20 divided by $80 is 0.25, which is a 25% increase. If it goes from $100 back to $80, the change is minus 20%, not minus 25%.

Common uses

Use it to measure raises, price changes, growth in website visitors or changes in rent. The starting value is always the base, so make sure you enter the old number first. For finding a percent of a number, use the percentage calculator.

Frequently asked questions

Why is a 25% increase not reversed by a 25% decrease?

Because the second percentage applies to a larger number. Going up 25% from 80 gives 100, but going down 25% from 100 gives 75.

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Estimates for education only, not financial advice.