What is it?
The Percentage Change Calculator shows by what percent a value went up or down. Enter the old value and the new value to see the change in percent, the difference, and the new value as a percent of the old one.
Who is it for?
Students, business owners comparing sales, investors, and anyone comparing an old and a new value.
How to use it
- Type the Old value, for example last year’s price.
- Type the New value.
- Read the change in percent and the Difference. It shows Increase or Decrease.
The answer appears as you type; there is no Calculate button. Tap Copy result to copy it, or Share on WhatsApp to send it.
Change or difference?
- Percentage change: when there’s a before and after. Price from ₹80 to ₹100 = +25%.
- Percentage difference: when comparing two values with no “original”, like two shops’ prices. It divides by their average, so the answer is the same in both directions.
Watch out
- Up 25% then down 25% doesn’t return to the start: 80 → 100 → 75.
- A change from 0 has no percentage (you can’t divide by zero).
- From 10% to 12% is a 2 percentage-point rise, but a 20% increase. News reports often mix these up.
Uses
Price rises, salary hikes, sales growth, marks improvement, weight loss and share price moves.
Worked example
Sales rose from ₹40,000 to ₹46,000: change +15%; new is 115% of old. If they fall back to ₹40,000 next month, that’s a 13% fall, not 15%, because the starting value is now bigger.
Errors and how to fix them
- “The old value cannot be 0”: change from zero has no percentage.
Open the tool: Percentage Change Calculator
Still stuck?
Contact support. Tell us which tool or page you were using, what you tapped, what you saw, and your phone or computer and browser (for example: Android phone, Chrome). We reply by email.
Questions, or an error not listed here?
Tell us in the comments: what you were doing, the exact message you saw, and your device and browser. We read every comment and add new fixes to this article.