Does this percentage calculator upload my numbers?
No. The calculation runs locally in your browser and the inputs are not uploaded.
Percentage calculations run locally in your browser. Nothing is uploaded.
Percentage Calculator
Run common percentage math instantly: find a percent of a number, calculate what percent one value is of another, or measure percentage increase and decrease.
Percentage calculations run locally in your browser. Nothing is uploaded.
Calculate percentages
Result 30
Fast percentage math for everyday numbers
Use this percentage calculator for discounts, taxes, grades, ratios, growth rates, price changes, and quick checks before copying the result. The related loan calculator uses percentage rates for payment math.
The formulas are simple and transparent: P% of N, X divided by Y as a percent, and percentage change from one value to another. Inputs stay in your browser.
How to use this tool
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Choose a percentage mode
Select percent of a number, what percent one value is of another, or percentage change.
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Enter the numbers
Fill in the labelled fields for the selected calculation. Divide-by-zero cases are shown clearly.
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Copy the result
Review the live percentage result and copy it when it is ready.
FAQ
How is percentage change calculated?
Percentage change is calculated as (new value minus old value) divided by old value, multiplied by 100.
Why does the tool reject zero in some modes?
What-percent and percent-change formulas divide by a total or starting value, so zero would create an undefined result.
Can I use this with negative numbers?
Yes. Negative values are accepted where the formula is defined, such as calculating a change from a non-zero starting value.