Percentage Calculator — Five Ways, Many Lines
Pick which percentage question you are asking, then answer forty of them at once.
Runs on your device What you paste is processed by your own browser. It is never sent to a server, and it is not stored anywhere after you leave the page.
Short answer
Percentages can be calculated for free in a web browser in five forms: X% of Y, X as a percentage of Y, the percentage change from X to Y, Y% added to X, and Y% taken off X. Each line of input supplies two numbers in any readable form — "25% of 180", "25, 180" or "25 180" — and is answered independently, so a whole column of figures is converted in one pass.
At a glance
| Accepts | Two numbers per line |
|---|---|
| Produces | Each line with its answer |
| Processing | In your browser |
| Price | Free, no limits |
| Account | Not required |
Almost every percentage mistake is a mistake about which question was being asked. "Up by 25%" and "25% of the total" and "25% more than before" are three different sums on the same two numbers, and a single box marked % cannot tell them apart. Choosing the form first is the whole point of the dropdown.
Percentage change is the one worth watching. Going from 80 to 100 is a rise of 25%, while going from 100 to 80 is a fall of 20% — the same gap measured against different starting points. The change mode always divides by the first number, which is what makes it the before value rather than whichever is smaller.
How to use it
- 1
Choose the question
X% of Y, X is what percent of Y, the change from X to Y, or X increased or decreased by Y%.
- 2
Type the numbers
Two per line, in the order the option names. Percent signs and the word "of" are ignored, so paste as you like.
- 3
Convert
Each line comes back with its answer. Add more lines to answer a whole column at once.
- 4
Copy the results
Copy the block to the clipboard, or download it as a text file.
Frequently asked questions
How do I work out a percentage increase?
Choose "X increased by Y%" and give the starting value first. For 80 plus 25%, type 80, 25 and the answer is 100.
Why is 80 to 100 a 25% rise but 100 to 80 a 20% fall?
Because a percentage is always measured against its starting point. The gap of 20 is a quarter of 80 and a fifth of 100. This is the single most common source of misleading percentages in reporting.
How do I calculate VAT or sales tax?
To add it, use "X increased by Y%". To find the tax portion alone, use "X% of Y" with the rate first. To get back to a pre-tax figure from a gross one, divide rather than subtract — a 20% tax removed from 120 is 100, not 96.
Can I paste a column of figures?
Yes. Each line is read as its own pair of numbers, so a column copied from a spreadsheet comes back as a column of answers.
Are my figures sent anywhere?
No. The arithmetic happens in your own tab. The numbers in a percentage calculation are often salary, invoice or tax figures, which is reason enough for the page to have no server behind it.