How to use this calculator
Type numbers and operators the same way you would on a physical scientific calculator. For a function key such as sin, log or √, enter the number first and then press the key: to find sin(30), press 3, 0, then sin. Trig functions (sin, cos, tan) read the angle mode shown above the keypad — switch between degrees and radians with the toggle. Memory keys (M+, M−, MR, MC) hold one value across calculations, shown by the marker in the top-left corner when active.
Function reference
| Key | What it does |
|---|---|
| sin, cos, tan | Trigonometric functions, in degrees or radians |
| log | Base-10 logarithm |
| ln | Natural logarithm |
| xʸ | Exponentiation (x to the power of y) |
| √ | Square root |
| x! | Factorial |
| π, e | Mathematical constants |
| % | Divides the displayed number by 100 |
| ± | Changes the sign of the displayed number |
| M+, M−, MR, MC | Add to, subtract from, recall, and clear memory |
| C | Clears the display and any pending operation |
Worked examples
| To calculate | Enter | Result |
|---|---|---|
| sin(30°) | 30, sin (degree mode) | 0.5 |
| cos(60°) | 60, cos (degree mode) | 0.5 |
| log of 1000 | 1000, log | 3 |
| ln of e | e, ln | 1 |
| 2 to the 10th power | 2, xʸ, 10, = | 1024 |
| 5 factorial | 5, x! | 120 |
| Square root of 144 | 144, √ | 12 |
Order of operations
This calculator works like a basic handheld one: each operation is applied when you press the next operator, from left to right. So 2 + 3 × 4 gives 20, not 14. To follow the usual order of operations, calculate the multiplication first (3 × 4 = 12) and then add 2, or store an intermediate result with M+ and recall it with MR.
Degrees or radians?
The most common mistake with trig is the wrong angle mode. Use degrees for everyday geometry and most school problems, and radians for calculus, physics and programming. As a check, sin(30) should be 0.5 in degree mode, but in radian mode it is about −0.988. Results are rounded to 10 decimal places, so values that should be exactly zero, like sin(π) in radian mode, display as 0.
When you see "Error"
- Dividing by zero
- Taking the square root of a negative number
- Taking log or ln of zero or a negative number
- Factorial of a negative number or a non-whole number
Why use an online scientific calculator
A browser-based scientific calculator is useful when you need trig or logarithmic functions quickly without installing an app or hunting for a physical calculator — for homework, lab reports, engineering estimates, or double-checking a spreadsheet formula. For converting units in the same problem, use the unit converter, and for percentages the percentage calculator. Working out a course average? Try the GPA calculator.