What each function does
| Key | Function | Example |
|---|---|---|
| sin, cos, tan | Trigonometric ratios | sin(30°) = 0.5 |
| sin⁻¹, cos⁻¹, tan⁻¹ | Inverse trigonometry, returns an angle | sin⁻¹(0.5) = 30° |
| ln | Natural logarithm, base e | ln(e) = 1 |
| log | Common logarithm, base 10 | log(1000) = 3 |
| eˣ | e raised to a power | e² = 7.389 |
| 10ˣ | 10 raised to a power | 10³ = 1000 |
| √ | Square root | √16 = 4 |
| ∛ | Cube root | ∛27 = 3 |
| x² | Square | 5² = 25 |
| xʸ | Power | 2⁸ = 256 |
| n! | Factorial | 5! = 120 |
| 1/x | Reciprocal | 1/4 = 0.25 |
| % | Percentage | 200 + 10% = 220 |
Order of operations
This calculator follows standard mathematical precedence rather than evaluating strictly left to right. That means 2 + 3 × 4 is 14, not 20.
| Order | Operations |
|---|---|
| 1 | Parentheses ( ) |
| 2 | Exponents and roots |
| 3 | Multiplication and division, left to right |
| 4 | Addition and subtraction, left to right |
The common mnemonics — PEMDAS in the US, BODMAS or BIDMAS in the UK and India — describe the same order. Note that multiplication and division sit at equal precedence and are evaluated left to right, as do addition and subtraction.
Memory keys
- M+ adds the displayed value to memory.
- M− subtracts it from memory.
- MR recalls the stored value.
- MC clears memory.
- The M indicator appears when memory holds a non-zero value.
For specific problems
A scientific calculator is a general tool. For particular kinds of problem these are faster:
- Percentage problems — the percentage calculator shows the working.
- Fractions — the fraction calculator keeps exact values rather than decimals.
- Grades and GPA — the GPA calculator and grade calculator.
- Financial maths — the compound interest calculator.
Frequently asked questions
How do I switch between degrees and radians?
Press the DEG/RAD key in the top-left of the keypad. The current mode is shown in the display.
Degrees are standard for geometry, trigonometry classes and engineering. Radians are used in calculus and most programming languages.
Why does 2 + 3 × 4 give 14 and not 20?
Because multiplication is evaluated before addition. 3 × 4 = 12, then 2 + 12 = 14.
If you want the addition first, use parentheses: (2 + 3) × 4 = 20.
Does it work with my keyboard?
Yes. Digits and the operators + − * / work directly, Enter evaluates, Escape clears everything, and Backspace deletes the last character.
Parentheses and the decimal point work too, so most expressions can be typed straight through.
Is my calculation sent anywhere?
No. Everything is evaluated in your browser. Nothing is transmitted, logged or stored on a server, and the history clears when you close the tab.