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Free online percentage calculator — calculate percentage increase, decrease, difference, percentage of a number, and reverse percentage. Fast, accurate, easy-to-use tool for daily math and finance.
Percentage Calculator is a free online math tool that works right in your browser — whatever you enter is processed locally and never sent to a server. No installation, no signup; works on both phone and desktop, ready to use instantly.
Math and statistics tools use JavaScript standard Math library with floating-point precision control. Covers everyday calculations, financial math, and statistical scenarios.
We noticed many online calculators track inputs or require accounts. We built this tool to run entirely in your browser — no tracking, no uploads, just instant results.
Homeowners and shoppers evaluating a big-ticket purchase. Before committing to a loan, payment plan, or subscription, use this tool to understand the real monthly and total cost so there are no surprises later.
Yes, completely free with no signup required.
Yes, it works on mobile browsers with touch support.
Math
All calculations use JavaScript standard Math library with floating-point precision control. Results are reliable.
ToolPure provides calculators for percentages, compound interest, statistics (mean, median, standard deviation), unit conversions, and number base conversions (binary, octal, decimal, hexadecimal).
Calculations use JavaScript Number type with up to 15-17 significant digits. For high-precision requirements, the tools support BigNumber.js for arbitrary precision arithmetic up to 100 decimal places.
Yes, calculation results can be copied to clipboard, downloaded as JSON or CSV files, or shared via URL parameters that encode the input values and results.
Yes. Percentage Calculator is a pure front-end tool: whatever you type or paste is processed only in your browser's memory and never sent to a server. It disappears as soon as you refresh or close the page.
🔒 Privacy & Security：All processing happens locally in your browser. Files are never uploaded or stored.
🔒 Privacy: All processing happens locally in your browser. Your files and data never leave your device — no upload, no server, no tracking.