🔢 ➕ ✖️ 📊

🔢 Simple Calculator Online

Free online calculator with basic and scientific modes. Perform all your calculations instantly in your browser.

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📋 History
No calculations yet

⌨️ Keyboard Shortcuts

0-9 Numbers
+ - * / Operations
Enter Calculate
Backspace Delete
Esc Clear All
. Decimal

📚 About Simple Calculator Online

Our free online calculator provides both basic and scientific calculation modes, making it perfect for students, professionals, and anyone who needs quick calculations. Whether you're doing simple arithmetic or complex trigonometric functions, this calculator has you covered.

The calculator works entirely in your browser with no downloads required. It supports keyboard input for faster calculations and maintains a history of your recent computations for easy reference.

🔢 Basic Mode

Standard arithmetic operations including addition, subtraction, multiplication, division, and percentages. Perfect for everyday calculations.

🔬 Scientific Mode

Advanced functions including trigonometry (sin, cos, tan), logarithms (log, ln), powers, roots, factorials, and mathematical constants.

⌨️ Keyboard Support

Full keyboard support for faster input. Use number keys, operators, Enter for equals, and Escape to clear.

📋 Calculation History

View and reuse your previous calculations. Click any history item to load it back into the calculator.

❓ Frequently Asked Questions

How do I use this online calculator? +
Simply click the number buttons or type on your keyboard to enter numbers. Use operation buttons (+, -, ×, ÷) to perform calculations. Press = or Enter to see the result. Toggle between Basic and Scientific modes for additional functions like trigonometry and logarithms.
What is the difference between Basic and Scientific mode? +
Basic mode offers standard arithmetic operations: addition, subtraction, multiplication, and division. Scientific mode adds advanced functions including trigonometric functions (sin, cos, tan and their inverses), logarithms (log base 10 and natural log), powers and roots, factorials, and mathematical constants like π (pi) and e (Euler's number).
Can I use keyboard shortcuts? +
Yes! The calculator fully supports keyboard input. Use number keys (0-9) for digits, +, -, *, / for operations, Enter or = for equals, Backspace to delete the last character, and Escape to clear all. You can also use parentheses for grouping.
Is this calculator accurate for scientific calculations? +
Yes! Our calculator uses JavaScript's built-in Math library which provides IEEE 754 double-precision floating-point arithmetic. This means it handles up to 15-17 significant digits of precision, which is suitable for most scientific and engineering calculations.
Are trigonometric functions in degrees or radians? +
The calculator uses radians by default, which is the standard for mathematical calculations. To convert from degrees to radians, multiply by π/180. For example, sin(90°) would be entered as sin(90 × π ÷ 180).
Does the calculator work offline? +
Once the page is loaded in your browser, all calculations are performed locally without needing an internet connection. However, you do need an internet connection to initially load the calculator page.
How do I calculate percentages? +
Use the % button after entering a number. For example, to find 20% of 150, enter 150 × 20 %. The calculator will compute 150 × 0.20 = 30. You can also use percentages in addition and subtraction: 100 + 15% will add 15% to 100.
What does the factorial (n!) function do? +
The factorial function (n!) multiplies all positive integers from 1 to n. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. Factorials are commonly used in probability, combinatorics, and statistics calculations.
Can I view my calculation history? +
Yes! The calculator maintains a history of your recent calculations shown below the keypad. Click on any history item to load that result back into the calculator. Use the "Clear All" button to remove the history.
Is my calculation data stored or shared? +
No. All calculations are performed entirely in your web browser. We do not store, transmit, or have access to any of your calculations. Your calculation history is stored only in your browser's memory and is cleared when you close the page.