A free scientific calculator that runs in your browser. Type an expression or tap the keys: trig functions in degrees or radians, logs, powers, roots, factorials and combinations, with a running history of your answers. No download and no sign-up.
How to use the scientific calculator
Type a full expression such as 3*(4+5)^2 or tap the keys, then press = or Enter. The calculator follows the standard order of operations (brackets, powers, multiplication and division, then addition and subtraction), the same rules your teacher and exam calculators use.
- Degrees or radians: choose the angle mode before using sin, cos and tan. sin(30) is 0.5 in degrees but −0.988 in radians.
- Implied multiplication:
2π,3(4+1)and2sin(30)all work. - Ans reuses your last answer, and clicking a line in the history puts that expression back on screen.
Supported functions
Worked examples
| Type this | Result | What it shows |
|---|---|---|
-2^2 | −4 | Powers are worked out before the minus sign |
2^3^2 | 512 | Powers stack from the right: 2^(3^2) |
sin(30) (deg) | 0.5 | Exact trig values in degree mode |
log(1000) | 3 | Common logarithm, base 10 |
ln(e^2) | 2 | Natural logarithm, base e |
ncr(10,3) | 120 | Combinations of 10 items taken 3 at a time |
Answers are shown to 12 significant figures. Very large or tiny numbers switch to scientific notation, for example 6.02e+23.
Frequently asked questions
Is this scientific calculator free?
Yes. It is completely free, runs in your browser and needs no download, app or sign-up. Nothing you type is sent to a server.
How do I switch between degrees and radians?
Use the Degrees / Radians switch above the screen. It changes how sin, cos, tan and their inverses read and return angles.
Why is −2^2 equal to −4?
Exponents are calculated before negation, so −2^2 means −(2²) = −4. Type (−2)^2 to get 4. This matches how textbooks and most scientific calculators work.
How do I calculate a factorial or nCr?
Type a number followed by ! for a factorial (5! = 120) or use nCr(n, r) for combinations and nPr(n, r) for permutations.
How accurate is it?
It uses standard double-precision arithmetic, accurate to about 15 significant digits, and displays 12. Tiny rounding errors like 0.30000000000000004 are cleaned up for display.
Related tools
Free educational tool by HawkInc. Results are calculated in your browser and rounded for display; check critical work by hand or with a second method.