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Use this percentage change calculator for a clear math & geometry estimate. Results update instantly in your browser.
What this calculator does
Measure the relative increase or decrease between an original and new value.
How to use this calculator
- Enter the original value and final value.
- Review the calculation assumptions before using the result.
- The sign shows whether the value rose or fell.
How to calculate
% change = (final − initial) / |initial| × 100
Enter the original and new values.
Worked example
Moving from 100 to 125 is a 25% increase.
Understanding your result
The sign shows whether the value rose or fell.
- A zero starting value has no percentage-change denominator.
- Double-check values and units before calculating.
Frequently asked questions
What does this percentage change calculator do?
Measure the relative increase or decrease between an original and new value.
How do I use this percentage change calculator?
Enter the original value and final value.
What does the result mean?
The sign shows whether the value rose or fell.
What should I check before relying on it?
A zero starting value has no percentage-change denominator.