French Baguette Tools
Percentage calculator
Three common percentage calculations, each with its own formula.
What is X% of Y?
X is what percentage of Y?
Percentage change between two values
Percentage calculator is a free tool that runs entirely in your browser, with no data ever sent to a server. Work out a percentage, a change over time, or the original value.
What it's for
Working out a discount, checking a price or measurement change, or quickly finding what proportion one number represents of another.
What this tool does not do
This tool only performs the calculation described above, without checking how you intend to use the result. There is no limit set by the tool itself : the only constraint is your device's memory.
Frequently asked questions
How do I calculate a percentage change by hand?
The formula is (new value minus old value) divided by the old value, multiplied by 100. A negative result signals a decrease.
Is my data sent to a server?
No : the numbers you type are processed entirely in your browser, on your device. They are never transmitted to a server.
Do I need to create an account or install anything?
No : the tool works directly on this page, with no sign-up and no install.
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