Percentage Increase Calculator
Calculate the percentage increase between two values with the exact formula.
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Quick Tip
Enter the original value — the number you are measuring from.
About This Tool
Why use Percentage Increase?
A percentage increase measures how much a value has grown relative to where it started: divide the increase by the original value and multiply by 100. Enter the original and new values and this calculator returns the percentage change, the absolute difference and the multiplier.
Example: a price that moves from 80 to 100 has increased by 20, and 20 ÷ 80 × 100 = 25%. The multiplier is 1.25, which is the number to multiply by if you want to apply the same increase again. Note that a 25% rise followed by a 25% fall does not return you to 80, because the second percentage is taken from the larger number.
Key Benefits
Percentage, difference and multiplier
You get all three at once: the percent change for reporting, the raw difference in units, and the multiplier for repeating the same growth.
Handles negative starting values
The change is measured against the absolute size of the original value, so comparisons still work when the starting figure is negative.
Works for any quantity
Prices, salaries, traffic, weight or test scores — the arithmetic is identical whatever the units are.
How to use Percentage Increase
- 1
Enter the original value — the number you are measuring from.
- 2
Enter the new value after the increase.
- 3
Read the percentage change, which is the increase expressed as a share of the original value.
- 4
Check the multiplier if you want to apply the same growth to other numbers: multiply by it once per period.
- 5
If the new value is smaller than the original, the percentage shows as negative, which is a decrease.
Best use cases
Work out a pay rise as a percentage of your previous salary.
Report month-on-month growth in sales, sign-ups or page views.
Check how much a supplier's price has risen since the last order.
Convert a raw increase into the percentage figure a report or assignment asks for.
Percentage Increase FAQs
What is the percentage increase formula?
Percentage increase = (new value − original value) ÷ original value × 100. For 80 to 100: (100 − 80) ÷ 80 × 100 = 25%.
Why is a 50% increase not cancelled by a 50% decrease?
Each percentage is taken from a different base. 100 increased by 50% is 150; 150 decreased by 50% is 75, not 100. To reverse a 50% increase you need to decrease by 33.3%.
What does the multiplier mean?
It is 1 plus the percentage as a decimal. A 25% increase has a multiplier of 1.25, so any number multiplied by 1.25 grows by the same 25%.
How do I calculate percentage increase over several years?
Divide the final value by the starting value, take the nth root (where n is the number of years) and subtract 1. That gives the average annual growth rate rather than the total change shown here.
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