# Percentage Calculator

URL: https://phishdestroy.io/developer-tools/percentage-calculator
Category: Misc
Where it runs: Runs locally (nothing you enter is uploaded)

Pick one of three modes and type two numbers: X% of Y, X as a percentage of Y, or the percentage change between an old and a new value.

## Example input

15% of 240

```
X% of Y mode: X = 15, Y = 240
```

Result 36.0000.

## FAQ

### How is percentage change calculated?

(new − old) ÷ |old| × 100, so going from 80 to 100 is 25% and from 100 to 80 is −20%. The old value must not be 0.

### Why do I see — instead of a result?

A number is missing or is zero where the formula cannot use it: X% of Y needs both numbers non-zero, X is ?% of Y needs a non-zero Y, and % Change needs a non-zero old value. Results are rounded to 4 decimal places.

### Is anything sent?

No. It is arithmetic in your browser.

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All tools: https://phishdestroy.io/developer-tools