Percentage change calculator
Calculate the percentage increase or decrease from an old value to a new value.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
How to use it
- Keep Percent change from X to Y selected.
- Enter the old value as X and the new value as Y.
- Read the percentage and the difference.
Handy for
Tracking prices, sales growth and test scores.
Good to know
A positive result is an increase and a negative result is a decrease.
Privacy: where the work happens
Everything you enter or choose is processed by JavaScript in your browser and never sent anywhere. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
How is percentage change calculated?
Subtract the old value from the new value, divide by the old value and multiply by 100.
Why can I not start from zero?
A change from zero cannot be expressed as a percentage, because dividing by zero is undefined.