Use this percentage calculator to answer everyday percent questions: what is X% of Y, what percent is A of B, or how much something increased or decreased. Students, shoppers and analysts get clear results without a spreadsheet. All math runs locally in the browser.
Everything runs in your browser. Your input is not sent to a server by this tool.
Choose what you need: percent of a number, percentage change, or what percent one number is of another. Enter values and read the result instantly.
Simple arithmetic: (part/whole)×100, base×(percent/100), and percent change (new−old)/old×100. Results update as you edit the fields.
Discounts, tips, exam scores and growth rates are everyday math—this removes calculator-app friction.
Percent change measures how much a value rose or fell relative to its starting amount.
Yes—use the fields that ask for the part and the whole, or percent of a number, depending on the mode.
Yes. Enter decimal values when needed.
Yes. Free to use with no account.
Watch for percent vs percentage-point confusion when comparing rates. Round only at the end for financial figures.
ToolBoxy keeps the Free Percentage Calculator free and simple: open the page, finish the task, and move on—no account wall. Related tools on this page point you to the next step.