Giga Useful ToolsData
Percentage calculator
Percentage of a value, what % one number is of another, or change between two.
Everything runs in your browser. No file is ever uploaded to a server.
- 1Pick the calculator you need: there are three separate boxes on the page.
- 2Type your numbers into the input fields; the result updates as you type, no button to press.
- 3For the percentage-of-value box, enter the number and the percentage; for the change box, enter the starting and ending values.
- 4Read the result in the highlighted box next to your inputs.
What are the three calculators actually doing?+
The first answers 'how much is X% of Y' (e.g. 20% of 50 = 10). The second flips it around: 'X is what % of Y' (10 is what % of 50 = 20%). The third gives the percentage change between two numbers, useful for price increases, discounts, or growth rates.
How precise are the results, and do negative numbers work?+
Results are rounded to 4 decimal places and formatted for your language (comma or period as needed). Negative numbers and decimals work fine in every field. The percentage-change box in particular is built for that, since a drop from 100 to 80 correctly shows -20%.
Is there a limit to how big the numbers can be?+
No hard limit: it's plain JavaScript arithmetic, so it handles anything from tiny decimals to large totals. Just keep in mind that dividing by zero (like asking what % of 0 a number is) has no defined answer, so that field will show a dash instead of a result.