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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
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.
Why doesn't a 50% decrease get undone by a 50% increase?
Because each percentage is calculated from a different base. A 50% decrease from 100 gives 50; a 50% increase is then applied to 50, not 100, giving 75 — not back to 100.
What does a negative result mean?
A negative change means the value decreased. This calculator reports the direction — increase or decrease — separately, alongside the size of the change.
Is percentage change the same as a percentage-point change?
No. A rate moving from 10% to 15% is a 5-percentage-point change but a 50% percentage increase, since 5 is half of the original 10. The two describe the same move very differently.