Budget split
Input: (1200 + 300) / 3
Result: 500 for each person
Basic Calculator
Free online basic calculator with support for addition, subtraction, multiplication, division, square roots, and parentheses. Fast, accurate, and easy to use.
0
Keyboard Shortcuts
0-9 Number input
+ - * / Operators
Enter Calculate
Esc Clear
Backspace Delete one character
Formula and decision logic
The basic calculator follows normal operator precedence, so multiplication and division are evaluated before addition and subtraction unless you use parentheses.
Result = expression evaluated with parentheses and operator precedence
Worked examples
Quick markup check
Input: 25000 - 18000
Result: 7000 gross difference
How to use this calculator
- 1Enter a number using the keypad or keyboard
- 2Select an operation (+, -, ×, ÷, √)
- 3Enter the second number and press = to get the result
Key Features
- Basic operations (+, -, ×, ÷)
- Square (x²)
- Square root (√)
- Parentheses operations
Calculation History
- Auto-save calculation history
- Reuse previous calculations
- Up to 100 records
- Uses local storage
Keyboard Shortcuts
- Number input
- Operators
- Calculate
- Clear
- Delete one character
How to read the result
- Use parentheses whenever the order of operations matters more than raw left-to-right input.
- If a result looks too large or too small, re-check whether a percent or division step should happen earlier.
Common input mistakes
- Typing a long expression without parentheses and assuming the calculator will group it the way you intended.
- Mixing percentage logic with plain subtraction instead of confirming the exact formula first.
Frequently asked questions
How do I use the basic calculator?
Simply enter numbers and click operation buttons (+, -, ×, ÷) to perform calculations. You can also use parentheses for complex expressions.
Does the basic calculator support keyboard input?
Yes, you can use your keyboard to enter numbers and operations. Press Enter to calculate the result.
Can I calculate square roots?
Yes, use the √ button to calculate the square root of any positive number.