Scientific Calculator Online – Free with Trig, Logs & History
A full scientific calculator in your browser: trigonometry in degrees or radians, logarithms, powers, roots, factorials and constants, with keyboard input and a history of results.
Type an expression like 2sin(30)+√16 or tap the keys, then press = or Enter. Switch between DEG and RAD for angles. The answer appears as you type, “Ans” reuses the last result, and the history keeps your last 12 calculations.
How to use Scientific Calculator
- Type with your keyboard or tap the on-screen keys.
- Check that the angle mode (DEG or RAD) is right for trig functions.
- Watch the live preview under the expression.
- Press = or Enter to calculate and save the result to the history.
- Use Ans to continue with the last answer, or tap C to clear.
What this calculator can do
It follows the normal order of operations: brackets first, then powers, then multiplication and division, then addition and subtraction. Powers are right-associative, so 2^3^2 is 2^9 = 512, and −2^2 is −4, just like on a school calculator. You can leave out the multiplication sign: 2π, 3(4+1) and 2sin(30) all work.
| Function | Type | Example |
|---|---|---|
| Sine, cosine, tangent | sin cos tan | sin(30) = 0.5 in DEG |
| Inverse trig | asin acos atan | asin(0.5) = 30 |
| Natural log, log base 10 | ln log | log(1000) = 3 |
| Powers and roots | ^ √ cbrt | 2^10 = 1024 |
| Factorial | ! | 5! = 120 |
| Percent | % | 50% = 0.5 |
| Remainder | mod | 17 mod 5 = 2 |
| Constants | π e Ans | Ans × 2 |
Degrees or radians?
Most school and everyday problems use degrees: a right angle is 90°. Radians are used in calculus, physics and programming: a right angle is π/2. If sin(90) gives 0.894 instead of 1, you are in RAD mode — switch to DEG. Tangent of 90° is undefined, so the calculator shows an error instead of a huge number.
Precise results
The calculator works with about 15 significant digits and rounds the display to 12, which hides tiny floating-point noise such as 0.49999999999999994. Very large or tiny results are shown in scientific notation, for example 6.022 × 10^23. To convert between notations, use the Scientific Notation Converter converter.
Keyboard shortcuts
You can type everything directly: numbers, + − * /, ^ for powers, ! for factorials, and function names such as sqrt( or ln(. Enter calculates, Escape clears and the arrow keys move the cursor. On phones the on-screen keypad is easier.
Related calculators
For single operations with step-by-step explanations, try the Exponent Calculator, the Square Root Calculator calculator or the Quadratic Equation Solver. Statistics such as mean and standard deviation are in the Standard Deviation Calculator calculator. Everything runs in your browser, so the calculator works offline once the page has loaded.
You may also find these free tools useful: GPA Calculator, LCM & GCF Calculator and Slope Calculator.
Frequently asked questions
How do I use a scientific calculator online?
Type an expression or tap the keys and press = or Enter. The result appears instantly and is saved in the history.
How do I switch between degrees and radians?
Tap the DEG/RAD button. In DEG mode sin(90) = 1; in RAD mode sin(π/2) = 1.
Why does −2^2 give −4?
Powers are calculated before the minus sign, as in standard maths notation. Write (−2)^2 to get 4.
Can I calculate factorials and logarithms?
Yes. Use n! for factorials, ln for the natural logarithm and log for base-10 logarithms.
Does it work offline?
Yes. Once the page has loaded, all calculations run in your browser without an internet connection.
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