Scientific Calculator
A full scientific calculator in your browser: trigonometry, logarithms, powers, roots, factorials and constants, with live results as you type. Use the keypad or your keyboard — everything runs locally and nothing you enter leaves your device.
How to use this calculator
- Type with the keypad or your physical keyboard — digits, + − × ÷, parentheses, ^ for powers, Enter for equals, Backspace to delete, Esc to clear.
- The result updates live under the expression as you type; press = to commit it.
- DEG/RAD switches how angles are interpreted: in DEG mode sin(90) = 1, in RAD mode sin(π/2) = 1.
- ANS inserts the previous result, so you can chain calculations. After pressing =, typing an operator also continues from the result.
- History keeps your recent calculations — tap one to load it back into the display.
Function reference
| Key | Meaning | Example |
|---|---|---|
| sin cos tan | Trigonometric functions (respects DEG/RAD) | sin(30) = 0.5 in DEG |
| asin acos atan | Inverse trig — returns an angle in the current mode | atan(1) = 45 in DEG |
| ln | Natural logarithm (base e) | ln(e) = 1 |
| log | Common logarithm (base 10) | log(1000) = 3 |
| √ | Square root | √(25) = 5 |
| ^ | Power (right-associative) | 2^10 = 1024 |
| x² | Square | 7x² key → 7^2 = 49 |
| 1/x | Reciprocal | 5 then 1/x → 0.2 |
| ! | Factorial (whole numbers up to 170) | 5! = 120 |
| % | Percent — divides by 100 | 200×15% = 30 |
| π, e | Constants pi and Euler's number | 2π ≈ 6.2832 |
Order of operations
The calculator follows standard mathematical precedence: parentheses first, then factorial and percent, then powers (evaluated right-to-left, so 3^2^2 = 3^(2^2) = 81), then unary minus, then multiplication and division, then addition and subtraction.
Note that −3² is read as −(3²) = −9, matching maths convention. Use (−3)² if you mean the square of negative three. Implicit multiplication is supported: 2π, 3(4+1) and (2)(3) all work.
DEG vs RAD — which should I use?
Degrees (DEG) divide a circle into 360 parts and are what most people use day to day — geometry homework, headings, slopes. Radians (RAD) tie angles to the circle's radius and are the natural unit in calculus and physics; a full circle is 2π radians.
The most common wrong-answer cause on any scientific calculator is being in the wrong mode. If sin(30) shows −0.988 instead of 0.5, you are in RAD mode.