Basic Calculator
A fast, free online basic calculator for everyday math – add, subtract, multiply, and divide numbers with instant results.
Tip: You can enter decimal numbers using a dot or comma.
Basic Calculator – Free Online Calculator for Quick Math
This free online basic calculator helps you quickly add, subtract, multiply, and divide numbers directly in your browser. It's perfect for everyday calculations at school, work, or home when you don't want to open a spreadsheet or reach for your phone's calculator app.
How to use the basic calculator
- Enter the first number in the "First number" field.
- Enter the second number in the "Second number" field.
- Select the operation you want to perform: add (+), subtract (−), multiply (×), or divide (÷).
- Click "Calculate" to instantly see the result.
- Use "Clear" to reset the calculator and start a new calculation.
Common use cases
- Adding up prices while shopping or budgeting.
- Checking homework or quick math problems.
- Calculating differences between two numbers, like profit or score changes.
- Dividing amounts equally between people or time periods.
Key features
- Supports whole numbers, decimals, and negative values.
- Works instantly in your browser with no sign-up required.
- Accessible interface with keyboard-friendly inputs and clear labels.
- Dark mode friendly design that stays easy on your eyes.
Basic calculator FAQs
Does this calculator round results?
Results are shown using the full precision provided by JavaScript's number type. For most everyday uses this is accurate enough, but for financial or scientific work you should verify results in a dedicated tool.
Can I use it on mobile?
Yes, the calculator is responsive and works on phones, tablets, and desktops as long as you have a modern web browser.