Basic Calculator

Memory: 0

Keyboard Shortcuts

0-9 Numbers
. Decimal
+ - * /
Enter =
Backspace ⌫
Esc Clear
% Percentage
M M+
S M-
R MR
C MC
Q √
H History
T Theme
0/150

Calculation History




Features of Online Basic Calculator

Our free online basic calculator provides simple arithmetic functions for everyday calculations:

Perfect for quick calculations, homework help, budgeting, and everyday math problems.

How to Use This Online Calculator

Memory Functions

Store values with M+, subtract from memory with M-, recall with MR, and clear memory with MC.

Calculation History

Review your past calculations with our built-in history feature that saves your work.

Keyboard Support

Use your keyboard for faster calculations with comprehensive shortcut support.

Mobile Friendly

Works perfectly on all devices from desktop computers to mobile phones.

Basic Calculator FAQs

How do I use the memory functions on this calculator?

The calculator includes four memory functions:
M+ (Memory Add): Adds the current display value to memory
M- (Memory Subtract): Subtracts the current display value from memory
MR (Memory Recall): Recalls the stored memory value to the display
MC (Memory Clear): Clears the memory back to zero

What keyboard shortcuts are available?

You can use your keyboard for faster calculations:
0-9: Number keys
+ - * /: Basic operations
Enter or =: Calculate result
Backspace: Delete last character
Esc: Clear display
M, R, C, S: Memory functions (M+, MR, MC, M-)
Q: Square root calculation
H: Toggle history panel
T: Toggle dark/light theme

How do I calculate percentages?

To calculate percentages:
1. Enter your base number
2. Press the operation button (+, -, ×, or ÷)
3. Enter the percentage amount
4. Press the % button
5. Press = to see the result
Example: To calculate 15% of 200, enter "200 × 15 % ="

Why is there a character limit of 150 characters?

The 150-character limit ensures optimal performance and prevents extremely complex calculations that might slow down the calculator. For most basic arithmetic operations, this limit is more than sufficient.

How do I view my calculation history?

Click the "History" button above the calculator display to view your recent calculations. You can click on any previous result to insert it into the calculator. Use the "Clear" button in the history panel to remove all history items.

Does this calculator follow the order of operations (PEMDAS/BODMAS)?

Yes, the calculator follows standard mathematical order of operations (Parentheses/Exponents, Multiplication/Division, Addition/Subtraction). However, for complex operations, it's recommended to perform calculations step by step or use our Scientific Calculator for advanced expressions.

How do I use the square root function?

Simply enter a number and press the √ button to calculate its square root. You can also press Q on your keyboard as a shortcut.

Can I use this calculator on my mobile device?

Yes, the calculator is fully responsive and works on all devices including smartphones and tablets. The buttons are sized appropriately for touch screens.

How do I switch between light and dark mode?

Click the moon/sun icon (🌓) in the top right corner of the calculator to toggle between light and dark themes. Your preference will be saved for future visits.

What happens if I get an "Error" message?

The "Error" message appears when you attempt an invalid operation such as:
- Division by zero
- Square root of a negative number
- Mathematical operations that don't compute
Simply press C or Esc to clear the error and start a new calculation.

How do the popup and keyboard shortcut features work?

The "Popup" button opens the calculator in a separate window, which is useful for multitasking. The "Shortcuts" button displays all available keyboard commands for faster operation without using your mouse.

Need More Advanced Calculations?

Scientific Calculator Percentage Calculator Algebra Calculator