Basic Calculator — Fast Addition, Subtraction, Multiplication & Division
A free online basic calculator with keyboard support and calculation history. Perform fundamental arithmetic operations instantly — no app download required.
Did our AI summary help? Let us know.
The four basic operations (+, −, ×, ÷) form the foundation of all arithmetic Keyboard shortcuts (Enter for equals, Escape for clear) speed up calculations Calculation history lets you track and verify multi-step work IEEE 754 double-precision provides ~15 significant digits of accuracy
Ready to run the numbers?
Why: Basic arithmetic is the foundation of all mathematics and daily life. From splitting a restaurant bill to calculating tips, budgeting expenses, or verifying a receipt — fast, accurate arithmetic is essential. Studies show that over 90% of everyday math involves the four basic operations.
How: Enter numbers and operations using the on-screen buttons or your keyboard. The calculator follows standard order of operations. Results appear instantly, and your calculation history is preserved so you can review or reuse previous computations.
Run the calculator when you are ready.
Basic Calculator
Add, subtract, multiply, and divide. Keyboard support and calculation history.
For educational and informational purposes only. Verify with a qualified professional.
🧮 Fascinating Math Facts
The oldest known mathematical artifact is the Lebombo bone (~43,000 BC), a baboon fibula with 29 tally marks used for counting.
— Smithsonian
The abacus, one of the earliest calculating tools, was used in ancient Mesopotamia around 2700 BC.
— Britannica
The first electronic general-purpose computer, ENIAC (1945), could perform 5,000 additions per second. Modern CPUs handle billions.
— Computer History Museum
The word "calculate" comes from the Latin "calculus" meaning "small pebble" — Romans used pebbles for counting.
— Oxford English Dictionary
📋 Key Takeaways
- • Use mouse or keyboard for fast calculations
- • C clears everything; Backspace deletes the last digit
- • % converts the displayed number to a percentage (divides by 100)
- • \u00B1 toggles positive/negative
📖 What Is a Basic Calculator?
A basic calculator performs the four fundamental arithmetic operations: addition (+), subtraction (−), multiplication (×), and division (÷). It is designed for quick, everyday calculations without the complexity of scientific or graphing calculators.
📝 How to Use
- Click buttons or type on your keyboard (0–9, +, −, *, /, Enter, Escape)
- Press C to clear everything, or Backspace to delete the last digit
- Use % to convert the displayed number to a percentage (divides by 100)
- Press \u00B1 to toggle positive/negative
- Press Enter or = to compute the result
📐 Arithmetic Operations
| Operation | Symbol | Example |
|---|---|---|
| Addition | + | 5 + 3 = 8 |
| Subtraction | − | 5 − 3 = 2 |
| Multiplication | × | 5 × 3 = 15 |
| Division | ÷ | 6 ÷ 3 = 2 |
⌨️ Keyboard Shortcuts
0–9, . — Enter digits and decimal point
+, −, *, / — Select operation
Enter or = — Calculate result
Escape — Clear all
Backspace — Delete last digit
% — Convert to percentage
⚠️ Common Mistakes to Avoid
- • Division by zero: Dividing by 0 produces an error
- • Order of operations: This calculator evaluates left-to-right (e.g., 2 + 3 × 4 = 20, not 14)
- • Floating-point precision: Some decimals may show rounding (e.g., 0.1 + 0.2)
❓ Frequently Asked Questions
Does it support order of operations?
No. This calculator evaluates sequentially (left-to-right). For PEMDAS, use our Scientific Calculator.
Can I use it on mobile?
Yes. The calculator is fully responsive and works on phones and tablets.
Where is my calculation history?
Recent calculations appear below the keypad. They are stored only in the current session.
How do I do percentages?
Enter a number, then press %. For example, 50% converts 50 to 0.5. For "50% of 200," enter 200 × 50% = 100.
🔗 Related Tools
For trigonometry, logarithms, exponents, and more, try our Scientific Calculator.
💡 Tip: For more advanced functions like trigonometry, logarithms, and exponents, use our Scientific Calculator.
Related Calculators
Scientific Calculator — Free Online Trig, Log, Powers
Free online scientific calculator with trigonometric functions (sin, cos, tan), logarithms (ln, log), exponents, factorials, memory, degree/radian mode, and...
MathematicsBig Number Calculator
Arbitrary-precision integer arithmetic. Add, subtract, multiply, divide very large numbers using BigInt.
MathematicsAddition Calculator
Add two or more numbers with this free addition calculator. Get the sum, carry detection for column addition, and step-by-step solutions. Simple mode for two...
MathematicsDivisibility Test Calculator
Test divisibility by 2-12 with step-by-step rules. Advanced: prime factorization, divisibility rules reference. Free calculator for students.
MathematicsDecimal to Fraction Calculator
Convert decimals to fractions and fractions to decimals with step-by-step explanations. Supports repeating decimals, continued fraction approximation, and...
MathematicsFraction to Percent Calculator
Convert any fraction a/b to percentage using (a/b) × 100. Supports mixed numbers, simplified fractions, and comparison table. Step-by-step solutions for test...
Mathematics