Basic Calculator | Free Online Calculator

Free online calculator with memory functions. Add, subtract, multiply, divide plus percentages, square roots, and keyboard shortcuts.

Free online calculator for basic math. Add, subtract, multiply, and divide with memory functions, percentages, and square roots.

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
help_outlineHow to Useexpand_more

Control the calculator using mouse, keyboard, number pad, or touch screen.

  1. Enter numbers using buttons or keyboard (0-9)
  2. Select an operation (+, −, ×, ÷)
  3. Enter the second number
  4. Press = or Enter to calculate
  5. Use memory buttons to store values for later

Keyboard Shortcuts:

0-9 Numbers
+ - * / Operations
Enter or = Calculate
Escape Clear all
Backspace Delete digit
. Decimal point
infoWhat is Basic Calculator | Free Online Calculator?expand_more

A simple online calculator with memory functions, similar to a handheld calculator. Perform basic math operations including addition, subtraction, multiplication, and division.

Calculator Functions:

÷ Division
× Multiplication
+ Addition
− Subtraction
√x Square root
% Percentage
+/− Toggle positive/negative
π Pi (3.14159...)

Memory Functions:

MC Memory clear
MR Memory recall
M+ Add to memory
M− Subtract from memory
functionsFormulaexpand_more

Basic Operations:

Addition: a + b
Subtraction: a − b
Multiplication: a × b
Division: a ÷ b

Percentage Calculations:

Add percentage: 100 + 20% = 120

Subtract percentage: 100 − 25% = 75

Find percentage: 50 × 10% = 5

Powers & Roots:

Square: 6 × = gives 36

Square root: √36 = 6

Repeating: 2 × = = = = gives 2⁵ = 32

lightbulbExamplesexpand_more

Addition

7.3 + 12.25 = 19.55

Subtraction

100 − 37 = 63

Multiplication

13 × 3 × 2 = 78

Division

25 ÷ 2 = 12.5

Square Root

√144 = 12

Percentage

35.25 + 7.5% = 37.89

Sales tax calculation

quizFAQexpand_more
How do I calculate sales tax or add a percentage?expand_more
Enter the price, press +, enter the tax percentage, press %, then =. For example: 35.25 + 7.5% = gives 37.89. The calculator automatically computes 7.5% of 35.25 (2.64) and adds it.
How do I calculate a discount?expand_more
Enter the original price, press −, enter the discount percentage, press %, then =. For example: 40 − 25% = gives 30.00. To add tax after discount, continue with + tax% =.
How do memory functions work?expand_more
MC clears memory. MR recalls the stored value. M+ adds the display to memory. M− subtracts from memory. An 'M' indicator shows when memory holds a value. Use memory for multi-step calculations.
How do I calculate powers like 2⁶?expand_more
Enter the base number, press ×, then press = repeatedly. Each = multiplies by the base again. For 2⁶: press 2 × = = = = = (five times) to get 64.
What's the difference between CE and AC?expand_more
CE (Clear Entry) clears only the current number you're typing, keeping the previous calculation. AC (All Clear) resets the entire calculator, clearing everything including pending operations.
Can I use this calculator on my phone?expand_more
Yes! The calculator is fully responsive and works with touch screens. Tap the buttons to enter numbers and operations, or tap the display to use your device's keyboard.