About This Calculator
The Percentage Increase Calculator Free is a fast, browser-based tool that shows how much a value has grown (or shrunk) as a percentage. Enter your original and new values to instantly see the percentage increase or decrease — no sign-up, no download, and your numbers never leave your device.
How to use
1. Enter your values
Type the original value and the new value into the two fields above.
2. View the result
The percentage increase updates automatically as you type, or tap Calculate for an instant result.
3. Reset anytime
Use the Reset button to clear both fields and start a new calculation.
Calculation Formula
The percentage increase between two values is calculated with this formula:
Percentage Increase = ((New Value − Original Value) / |Original Value|) × 100
Subtract the original value from the new value, divide the result by the absolute value of the original, then multiply by 100 to get the percentage. A positive result means an increase; a negative result means a decrease.
Calculation Examples
Example 1 — Increase
Original value: 50, New value: 75. Calculation: ((75 − 50) / 50) × 100 = 50. Result: a 50% increase.
Example 2 — Decrease
Original value: 80, New value: 60. Calculation: ((60 − 80) / 80) × 100 = −25. Result: a −25% decrease.
Example 3 — Doubling
Original value: 120, New value: 240. Calculation: ((240 − 120) / 120) × 100 = 100. Result: a 100% increase.