Percentage Change Calculator — Free Online Tool
Find the percentage increase or decrease between two values.
About Percentage Change Calculator
The Percentage Change Calculator measures how much a value has gone up or down between a starting point and an ending point, expressed as a percentage. Enter a "from" value and a "to" value, and it tells you both the percentage change and the absolute difference.
This is the tool to reach for when comparing prices over time, tracking growth in sales or followers, or summarising any before-and-after figure. The result clearly states whether the change is an increase or a decrease, and the maths runs locally in your browser.
How to Use Percentage Change Calculator
- Enter the starting (from) value.
- Enter the ending (to) value.
- Click "Calculate" to process the change.
- Read the percentage change and the absolute difference, labelled as an increase or decrease.
Key Features
Percentage increase or decrease between two values
Shows the absolute difference too
Clearly labels the direction of change
Handles negative values correctly
Private, instant calculation in your browser
Frequently Asked Questions
How is percentage change calculated?
Subtract the from value from the to value, divide by the absolute from value, then multiply by 100. A positive answer is an increase and a negative one is a decrease.
What is the difference between this and a percentage calculator?
This tool focuses only on the change between two values, while the general percentage calculator also handles "X% of Y" and ratio questions.
Why can't the from value be zero?
Percentage change divides by the starting value, and dividing by zero is undefined, so a non-zero from value is required.
How is a decrease shown?
A decrease appears as a negative percentage and is labelled "Decrease", so you can tell the direction at a glance.