This basic calculator is a web-based tool to do simple arithmetic operations like addition, subtraction, multiplication, and division. It looks and behaves just like a regular hand-held calculator, and it’s perfect for quick math calculations right in your web browser.

Programmed using JavaScript, HTML and CSS, the calculator has buttons for the digits 0–9, basic operators like +, –, ×, ÷, an all clear key, and an equals key. Calculations are processed locally in your browser using JavaScript, so the webpage does not need to interact with a server.

The calculator also features a square root key, a percentage key and a plus/minus button to change the sign of your working entry. Once you enter numbers the AC clear key becomes a CE key so you can correct input errors.

This web-based calculator is lightweight, mobile-friendly, and you can operate it with a mouse, number pad, keyboard, or touch screen.

If you need an online calculator with additional functionality like powers or exponents, pi, memory features, and repeating operations please the CalculatorCave® Basic Calculator page.