Percentage Increase Calculator
Calculate the percentage increase or decrease between two numbers.
Enter your values, then press the button below:
Percentage increase formula
Percentage change = (new value − original value) ÷ original value × 100. A positive result means an increase; a negative result means a decrease.
Example
If a price rises from 80 to 100, the increase is 20. Divide 20 by 80 to get 0.25, then multiply by 100: a 25% increase.
Increase versus decrease
Going from 100 to 80 is a 20% decrease, but going back from 80 to 100 is a 25% increase, because each change is measured against a different starting value.
Frequently asked questions
How do I calculate percentage increase?
Subtract the original value from the new value, divide the result by the original value, and multiply by 100.
What does a negative percentage change mean?
A negative result means the new value is lower than the original value, which is a percentage decrease.
Why can the original value not be zero?
Percentage change divides by the original value, and division by zero is undefined.