Basic Calculator

The Basic Calculator handles everyday arithmetic — addition, subtraction, multiplication, division and percentages — through a clean, keyboard-friendly interface that works instantly in your browser. It's built for the moments when you need a quick answer without hunting for your phone, opening a spreadsheet, or waiting for a heavier app to load: splitting a restaurant bill, checking a total before checkout, or double-checking a homework answer. As a free online calculator, it requires no signup, no download and no account, and it runs entirely client-side, so results appear the instant you press equals.

Every button on screen has a keyboard equivalent, which makes this basic calculator noticeably faster than most operating-system calculators once you get used to it: type the digits and operators directly (+, -, *, /), press Enter or = for the result, and press Escape or C to clear and start fresh. There's no need to reach for the mouse mid-calculation, and the large, high-contrast display stays readable even on small phone screens or in bright light.

Calculations are evaluated in the order you enter them, the same way a standard pocket calculator behaves — 10 + 5 × 3 gives 45, not 25, because each operation applies to the running total as soon as you press the next operator. This mirrors the mental model most people already have from physical calculators, so results stay predictable even for multi-step chains. The percent key works the same way, multiplying the current value by the entered percentage — useful for tips, discounts and quick markups without doing the decimal conversion in your head.

The calculator works offline once the page has loaded, keeps no history of what you type, and never shows ads inside the calculation area itself. Whether you're using it as a general online calculator for one-off sums or reaching for it dozens of times a day at work, it's designed to stay out of your way and just return the right number.