Basic Calculator
Free online basic calculator for addition, subtraction, multiplication, and division. Simple and easy to use with memory functions.
Quick examples:
A simple calculator with memory functions similar to a handheld calculator. Supports addition, subtraction, multiplication, division, exponents, square root, percentage calculations and rounding.
Button Functions
÷ × − +Basic operations
±Toggle positive/negative
√xSquare root
xʸPower (exponent)
%Percentage
πPi (3.1415926536)
R2Round to 2 decimals
R0Round to whole number
CEClear current entry
ACAll clear (reset)
Memory Functions
mcClear memory (set to 0)
mrRecall memory value
m−Subtract from memory
m+Add to memory
Keyboard Shortcuts
0-9, .Enter numbers
+ - * /Operations
EnterCalculate result
BackspaceDelete last digit
EscapeClear
^Power
rSquare root
pPi
Tips
- Repeat operations: Press = multiple times to repeat. Example: 3 + 5 = = = gives 18
- Percentage: For +/−, calculates percent of first number. Example: 100 + 10% = 110
- Powers: Use xy for exponents. Example: 2 xy 10 = 1024
- Memory: Use m+ to accumulate values, mr to recall the total
How to Use
- Click number buttons or use your keyboard to enter numbers
- Click an operation button (+, −, ×, ÷) to perform calculations
- Press = or Enter to see the result
- Use memory buttons (M+, M-, MR, MC) to store and recall values
- Press AC to clear all, or use backspace to delete the last digit
What is Basic Calculator?
A basic calculator is a simple tool for performing fundamental arithmetic operations: addition, subtraction, multiplication, and division. This calculator also includes percentage calculations, square root, sign change, and memory functions for convenience.
Formula
Addition: a + b
Subtraction: a − b
Multiplication: a × b
Division: a ÷ b
Percentage: a% of b = (a × b) / 100
Examples
- 15 + 27 = 42 - Addition
- 100 − 37 = 63 - Subtraction
- 12 × 8 = 96 - Multiplication
- 144 ÷ 12 = 12 - Division
- √81 = 9 - Square root
FAQ
How do I calculate a percentage?
Enter the first number, press an operator (+ or -), enter the percentage, and press %. For example, to add 20% to 100: enter 100, press +, enter 20, press %, then =. The result is 120.
How do memory functions work?
M+ adds the current value to memory, M- subtracts from memory, MR recalls the stored value, and MC clears the memory. The 'M' indicator shows when a value is stored.
Can I use keyboard shortcuts?
Yes! Use number keys (0-9), operators (+, -, *, /), Enter or = for equals, Escape for clear, and Backspace to delete. You can also use 'r' for square root.