Use the tool
Why use this percentage change calculator online?
This lightweight page focuses on speed, privacy, and practical output. It is frontend-only, mobile-friendly, and designed for quick everyday tasks without account creation.
Frequently asked questions
How do you calculate percentage change?
Percentage change equals (new value minus old value) divided by old value, multiplied by 100.
Can it calculate decreases?
Yes. Negative results show a percentage decrease.
What if the original value is zero?
Percentage change from zero is undefined, so the tool shows a clear warning.