Percentage guide
Percentage Increase Calculator
Use this percentage increase calculator to compare an original value with a larger new value. It is useful for price rises, salary changes, sales growth, and any situation where you need to express a gain relative to where you started.
Calculate a percentage increase
Enter the starting value and the value after the increase.
The interactive calculator loads with the page so you can enter your own values and see the result instantly.
How to calculate percentage increase
The original value is always the baseline. Dividing the increase by that baseline tells you how large the change is in relative terms.
Formula: ((new value − original value) ÷ original value) × 100
- Subtract the original value from the new value to find the amount of the increase.
- Divide that increase by the original value.
- Multiply by 100 to convert the decimal into a percentage.
Example: a price rises from $80 to $100
The increase is $20. Divide $20 by the original $80 to get 0.25, then multiply by 100. The price increased by 25%.
Frequently asked questions
How do I calculate a percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100. A rise from 80 to 100 is (20 ÷ 80) × 100 = 25%.
Why do I divide by the original value?
A percentage increase measures the size of a gain against the value you started with. Using the original value keeps comparisons consistent.
What is the percentage increase from 80 to 100?
The increase is 20. Divide 20 by 80 and multiply by 100, giving a 25% increase.
Can percentage increase be more than 100%?
Yes. If the new value is more than double the original value, the increase exceeds 100%.
What if the original value is zero?
Percentage increase from zero is undefined because the formula divides by the original value. Report the absolute change instead.
Is a 50% increase reversed by a 50% decrease?
No. Increasing 100 by 50% gives 150, then decreasing 150 by 50% gives 75. The percentages use different baselines.
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