Percentage Change Calculator
Percentage Change Calculator: free, instant and private. The base is always the old value, so a rise and a following fall of the same percent do not cancel out.
How the Percentage Change Calculator works
The Percentage Change Calculator takes From value, To value and returns the answer instantly — no button to hunt for, no page reload. The base is always the old value, so a rise and a following fall of the same percent do not cancel out. A 50% gain needs only a 33.3% loss to be wiped out.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
change % = ((new − old) ÷ old) × 100
| Symbol | Meaning |
|---|---|
| old | the starting value |
| new | the value after the change |
The base is always the old value, so a rise and a following fall of the same percent do not cancel out. A 50% gain needs only a 33.3% loss to be wiped out.
Inputs used: From value, To value.
Worked example
Take the default example — from value of 250, to value of 300:
- Percentage change: 20
- Direction: increase
Frequently asked questions
- What formula does the Percentage Change Calculator use?
- It uses change % = ((new − old) ÷ old) × 100, where old is the the starting value; new is the the value after the change.
- Is the Percentage Change Calculator free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- The base is always the old value, so a rise and a following fall of the same percent do not cancel out. A 50% gain needs only a 33.3% loss to be wiped out.
- Does the Percentage Change Calculator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.