Basic Calculator
Add, subtract, multiply, and divide instantly. Works with mouse, touch, or keyboard — plus a built-in history panel for recent results.
Keyboard Shortcuts
Use your keyboard anywhere on this page (except text fields).
Quick Operation Reference
Common everyday calculations this tool handles.
| Operation | Example | Result |
|---|---|---|
| Addition (+) | 125 + 375 | 500 |
| Subtraction (−) | 1,000 − 247 | 753 |
| Multiplication (×) | 24 × 15 | 360 |
| Division (÷) | 144 ÷ 12 | 12 |
| Percent (%) | 250 then % | 2.5 |
What Is a Basic Calculator?
A basic calculator (also called a simple or four-function calculator) performs the four core arithmetic operations: addition, subtraction, multiplication, and division. Unlike a scientific calculator, it does not include trigonometry, logarithms, or graphing — which keeps the interface fast and easy for everyday math.
This free online basic calculator runs in your browser with no download required. It supports decimal numbers, negative values, percentage conversion, chain calculations (e.g. 50 + 20 × 2), and a scrollable history so you can reuse recent answers.
When to Use a Basic Online Calculator
- Shopping & budgeting — split bills, compare prices, or check change.
- Homework checks — verify addition, subtraction, multiplication, and division problems.
- Work & office tasks — quick totals for invoices, receipts, or inventory counts.
- Travel — convert distances, tip amounts, or currency estimates on the go.
- Cooking — scale recipe quantities up or down.
How Order of Operations Works Here
This calculator evaluates operations left to right as you enter them — the same way most handheld four-function calculators work. For example, 10 + 5 × 2 gives 30 (not 20), because it computes 10 + 5 first, then multiplies by 2. If you need PEMDAS/BODMAS priority (multiplication before addition), use parentheses in a scientific calculator or work step-by-step.
Basic vs. Scientific Calculator
| Feature | Basic Calculator | Scientific Calculator |
|---|---|---|
| +, −, ×, ÷ | Yes | Yes |
| Percent & decimals | Yes | Yes |
| sin, cos, tan | No | Yes |
| Logarithms & powers | No | Yes |
| Best for | Daily arithmetic | Algebra, trig, physics |
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Basic Calculator FAQ
Is this basic calculator free to use?
Yes. This basic online calculator is completely free — no sign-up, no install, and no limits on how many calculations you run.
What operations does a basic calculator support?
A standard basic calculator supports addition (+), subtraction (−), multiplication (×), and division (÷), along with decimals, negative numbers, and percent conversion.
Can I use keyboard shortcuts?
Yes. Use number keys and +, −, *, / for operations. Press Enter or = for the result, Backspace to delete, Escape to clear, and % for percent.
What happens if I divide by zero?
Division by zero is undefined. The display shows an error message. Press AC or Escape to reset and start a new calculation.
Does the calculator save my history?
Completed calculations appear in the History panel during your session. History clears when you close the tab or press Clear in the history panel.
What is the difference between a basic and scientific calculator?
A basic calculator handles everyday arithmetic only. A scientific calculator adds advanced functions like trigonometry, logarithms, exponents, and parentheses for complex expressions.