What is the Percentage Increase Calculator?
This calculator shows how much a value has grown or shrunk in percent from a starting figure to a new one, for prices, salaries, populations and more.
How to use the Percentage Increase tool
- Enter Starting value and New value.
- The result updates instantly as you type, or press Calculate.
- Use Try an example to see how it works, and Reset to start again.
Formula
Percentage change = (new value − starting value) ÷ |starting value| × 100.
Worked example
With starting value 50, new value 75, the percentage increase comes to 50%. Difference: 25.
Frequently asked questions
What if the result is negative?
A negative change means a decrease. The calculator labels it a percentage decrease automatically.
Why can an increase be over 100%?
If the new value is more than double the old one, the increase exceeds 100%.
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Checked by Calcovate · Formula tested against worked examples · Updated 7 Nov 2026 · How we check our calculators.