Calculators

Percentage Increase or Decrease Calculator

Calculate how much a number increased or decreased. Example: a product price increased from $200 to $270. What is the percentage increase?

Example: A product price changed from $200 to $270. What is the percentage increase?

Old number New number

Result 35% increase The number increased from 200 to 270.

Amount of increase 70

The percentage is calculated from the old number: 200

How was this calculated?

((new − old) ÷ old) × 100

This calculation runs in your browser. Your values are not sent to our server.

How it works

Enter the old number first, then enter the new number.
The tool tells you whether the number increased or decreased, shows the amount of change, then the percentage change.
Percentage change is always compared with the old number. From 200 to 270, the increase is 35%.
If you reverse the numbers from 270 to 200, the decrease is about 25.93% because the comparison now starts from 270.

What is the percentage increase from 200 to 270?

The increase is 35%.

What is the percentage decrease from 270 to 200?

The decrease is about 25.93% because the percentage is measured from the old number, 270.

Why is 200 to 270 a 35% increase, but 270 back to 200 is not a 35% decrease?

Because the starting point changes. The increase is measured from 200, while the decrease is measured from 270.

Why can’t the old number be zero?

Percentage change divides by the old number, and division by zero is undefined.

Can I use decimal numbers?

Yes. The calculator supports decimal values and keeps the calculation precise internally.