Calculator
Free online calculator with basic and scientific modes. Trigonometry, logarithms, powers and history — all in your browser.
About Calculator
Sometimes the fastest way to run a calculation is right in the browser tab you already have open. Our Calculator provides both a standard arithmetic mode for everyday calculations and a full scientific mode for mathematics, engineering, and science — without downloading an app or searching your desktop for a calculator.
The scientific mode includes trigonometric functions (sin, cos, tan) operating in degrees, inverse trig, logarithms (log base 10 and natural log ln), powers, square roots, factorial, and the mathematical constants π and e. Every calculation is added to a running history panel, and you can click any past result to load it back into the display — useful when building multi-step calculations or reusing an intermediate value.
Full keyboard support means you never have to reach for the mouse. Type numbers and operators directly, press Enter to evaluate, Escape to clear, and Backspace to delete the last character. The result is a seamless calculation experience that feels as fast as a physical calculator but lives where you actually work: the browser.
How to Use Calculator
- 1Use the number pad and operator buttons for basic arithmetic, or type using your keyboard.
- 2Press Enter or the = button to evaluate the current expression.
- 3Toggle to Scientific mode using the button at the top to access trigonometry, logs, and constants.
- 4Press Escape or AC to clear the current entry; press Backspace to delete the last character.
- 5Click any entry in the history panel to reload that result into the display.
Use Cases
- →Run quick arithmetic without leaving the browser or switching to another app
- →Perform scientific calculations for engineering, physics, or mathematics coursework
- →Reuse a previous result from the history panel in a multi-step calculation
- →Calculate percentages, square roots, and powers quickly in basic mode
- →Use as a lightweight replacement for a physical calculator during online learning
- →Evaluate trigonometric expressions when working on geometry or CAD problems
Tips
- ✓Use keyboard shortcuts: numbers, +−×÷ for operators, Enter for =, Escape for clear, Backspace to delete
- ✓Trigonometric functions operate in degrees by default — convert radians manually if needed (1 rad = 180/π degrees)
- ✓Click any history entry to load that exact result back into the input for further calculation
- ✓Use the % button to calculate percentage values — e.g., type 200 × 15% to get 30
- ✓The √ button computes the square root; for cube roots use the x^y button with the exponent 1/3
- ✓Switch between basic and scientific mode at any time without losing the current display value
Frequently Asked Questions
Yes. The calculator is completely free, requires no account, and runs entirely in your browser. There are no usage limits and nothing is sent to any server.
Click the "Scientific" toggle at the top to reveal trigonometric functions (sin, cos, tan), logarithms (log, ln), square root, powers (x², xʸ), reciprocal (1/x), and the constants π and e. Trigonometric functions use degrees.
Yes. Type numbers and operators directly: + − * / for arithmetic, ^ for powers, % for percent, parentheses, Enter or = to calculate, Escape to clear everything, and Backspace to delete the last character.
Your last 10 calculations are stored locally in your browser via localStorage so you can revisit or reuse them. Click any history entry to load its result. Clearing your browser data removes the history.
Dividing by zero shows "Error" on the display. Press AC to reset and start a new calculation.
Results are computed with standard double-precision floating-point math and rounded to 12 significant digits. Very large or very small numbers automatically switch to scientific notation.