FREE TOOL

Basic Calculator

Fast, accurate and free online calculator. Arithmetic, percentages, roots — all in your browser with keyboard support.

ToolHubz Calculator
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Keyboard supported — type freely

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Frequently Asked Questions

Everything about the Basic Calculator tool

Yes! 100% free — no sign-up, no subscription, no hidden charges. All ToolHubz tools are permanently free for everyone.
Once the page is fully loaded, all calculations run locally in your browser using JavaScript. No server calls are needed — it effectively works offline after the initial load.
Yes! Full keyboard support is built-in. Use number keys (0–9), operators (+, −, *, /), Enter or = to calculate, Backspace to delete the last digit, and Escape to clear everything.
Yes. Press the % button to convert the current number to a percentage value, or chain it like "200 + 10%" to add 10% of 200.
History is stored only in the current browser session and displayed in the history panel (clock icon). It is never sent to any server — your data stays private and clears when you close or refresh the page.
Absolutely! The calculator is fully responsive with a mobile-first design. It provides a native app-like experience on smartphones and tablets — no pinching or zooming needed.
Supported operations: Addition (+), Subtraction (−), Multiplication (×), Division (÷), Percentage (%), Square (x²), Square Root (√), Sign toggle (+/−), Decimal, Backspace, and full expression history.
Results use JavaScript's native IEEE 754 floating-point engine with rounding applied to 10 decimal places to avoid common display issues (e.g., 0.1 + 0.2 correctly shows 0.3). For high-precision financial calculations, use a specialized tool.

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