Scientific Calculator Online
A free, browser-based scientific calculator with trigonometry, logarithms, roots, powers, factorials and constants — switch between degrees and radians instantly, no download or sign-up required.
Full-Function Scientific Calculator
Type an expression or tap the keys below. Use the DEG / RAD toggle to control how sin, cos and tan interpret your numbers, and use parentheses to control the order of operations — just like on a physical scientific calculator.
Calculator
Functions & History
Supported operations and your recent calculations
| Key | Function |
|---|---|
| sin, cos, tan | Trigonometric functions (uses DEG/RAD mode) |
| sin⁻¹, cos⁻¹, tan⁻¹ | Inverse trigonometric functions |
| log | Base-10 logarithm |
| ln | Natural logarithm (base e) |
| √ | Square root |
| xʸ | Exponent — enter base, tap xʸ, enter power |
| n! | Factorial of a non-negative integer |
| π, e | Mathematical constants pi and Euler’s number |
Scientific Calculator FAQ
Everything you need to know about using this online scientific calculator.
Use the DEG / RAD toggle above the display. In DEG mode, trigonometric functions like sin, cos and tan treat the number you enter as degrees. In RAD mode they treat it as radians. Switching the toggle recalculates your current expression automatically.
It supports sin, cos, tan and their inverse functions asin, acos and atan, plus log (base 10), ln (natural log), square root, powers using the ^ key, factorial using the ! key, percentage, and the constants pi and e. Standard arithmetic operators and parentheses for grouping are also supported.
Yes. Parentheses work exactly as in standard mathematical notation, so an expression like (2+3)*sin(45) is evaluated with the bracketed part calculated first, following normal operator precedence for everything else.
Factorial (the ! key) is only defined for non-negative integers in this calculator. Entering a negative number or a decimal before ! will return an error, since factorial has no standard elementary definition for those values here.
Yes, it is completely free to use with no sign-up. All calculations run directly in your browser using JavaScript, nothing is sent to a server, and nothing is stored once you close or refresh the page.