Basic Calculator
Free Online Basic Calculator
Our free online basic calculator lets you perform everyday arithmetic instantly — addition, subtraction, multiplication, and division — right inside your web browser. No app to install, no account required, and it works on every device from smartphones to desktop computers.
How to Use This Calculator
Click the digit buttons (0–9) to enter numbers, choose an operator (+ − × ÷), enter the second number, and press = to see the result. The C button clears everything and resets to zero. The +/− button toggles the sign of the current number, and % converts it to a percentage (divides by 100). You can also type directly using your keyboard — number keys, operators, Enter for equals, and Backspace to delete the last digit.
What Is a Basic Calculator?
A basic calculator is a tool that carries out the four fundamental arithmetic operations: addition, subtraction, multiplication, and division. The concept dates back to the 17th century when Blaise Pascal built the Pascaline, a mechanical device that could add and subtract. By the 1970s, pocket electronic calculators became mainstream, and today these same operations are handled instantly in software.
Everyday Use Cases
- Shopping: Add up item prices and check change.
- Budgeting: Subtract expenses from income to track savings.
- Cooking: Multiply or divide recipe ingredient quantities.
- Splitting bills: Divide a restaurant bill evenly among friends.
- School homework: Verify arithmetic answers quickly.
Keyboard Shortcuts
This calculator fully supports keyboard input. Use the number row or numpad for digits, + - * / for operators, Enter for equals, Backspace to delete the last character, and Escape to clear.