How to use the calculator
The calculator works like a modern school calculator with natural input: type the whole expression the way you would write it on paper, then press =. While you type, the display already shows a preview of the result.
- Enter an expression, for example 2 × sin 3 0 ). Open brackets are closed automatically at the end.
- Press = or Enter. The result is stored as Ans and added to the history.
- Keep going: after =, pressing + continues with the last result.
- The second functions printed in yellow above the keys are reached with 2nd, then the key.
DEL removes the last character, AC clears everything. On a computer you can do every calculation from the keyboard.
Every function at a glance
Examples assume degree mode (DEG).
| Key | Meaning | Example |
|---|---|---|
| sin cos tan | Sine, cosine, tangent | sin(30) = 0.5 |
| sin⁻¹ cos⁻¹ tan⁻¹ | Inverse trig functions (via 2nd) | sin⁻¹(0.5) = 30 |
| sinh cosh tanh | Hyperbolic functions and their inverses | cosh(0) = 1 |
| ln | Natural logarithm, base e | ln(e) = 1 |
| log | Common logarithm, base 10 | log(1000) = 3 |
| eˣ 10ˣ | Exponential functions (via 2nd) | 10^(3) = 1,000 |
| √ ∛ | Square root and cube root | ∛(27) = 3 |
| ˣ√ | nth root: first n, then ˣ√, then the radicand | 4 ˣ√ 81 = 3 |
| x² x³ xʸ | Square, cube, any power | 2^10 = 1,024 |
| x! | Factorial, gamma function for decimals | 5! = 120 |
| % | Percent, divides by 100 | 200 × 15% = 30 |
| mod | Remainder of a division | 17 mod 5 = 2 |
| |x| 1/x | Absolute value and reciprocal (via 2nd) | abs(−7) = 7 |
| ᴇ | Power of ten for scientific notation | 3.2ᴇ−5 = 0.000032 |
| π e | Pi and Euler's number | π = 3.14159265359 |
| Ans | Last result | Ans × 2 |
| M+ M− MR MC | Memory add, subtract, recall, clear | M+ on 12 → M = 12 |
Degrees or radians?
Angles can be entered in degrees (DEG) or radians (RAD). A full turn is 360° or 2π rad, so a right angle is 90° or π/2 rad. The current mode is shown at the top of the display; the DEG key switches it.
School geometry, surveying and construction almost always use degrees. Calculus, physics and programming usually use radians. If sin(90) does not return 1, the calculator is probably set to RAD.
Order of operations
The calculator follows the standard order of operations, known as PEMDAS in the US and BODMAS in the UK. Within one level it works left to right, except powers, which work right to left (2^3^2 = 2^9 = 512).
- Brackets( ) and functions
- Powersx², xʸ, roots
- Multiply, divide×, ÷, mod
- Add, subtract+, −
A minus sign in front of a power applies to the whole power: −2² gives −4. For (−2)² = 4, type the brackets. You can leave out the multiplication sign between a number and a bracket or function: 2π and 3(4+1) are read as products.
Frequently asked questions
Is this scientific calculator free?
Yes. It is free to use for good, with no sign-up and nothing to install. It is funded by clearly labelled ads.
How do I enter a number like 3.2 × 10⁻⁵?
Type 3.2, then the ᴇ key, then − and 5. ᴇ means “times ten to the power of” and works like the EE or EXP key on handheld calculators.
Why is −2² equal to −4?
Powers are evaluated before the sign, which is the mathematical convention. For (−2)² = 4, include the brackets.
How accurate is the calculator?
It calculates in double precision, about 15 to 16 significant digits, and displays 12 so that rounding noise such as 0.1 + 0.2 = 0.30000000000000004 stays out of the way.
Does it work on my phone?
Yes, the page is built for smartphones. Use “Add to Home Screen” to keep it like an app. Once loaded, every calculation runs on your device.
Are my calculations saved?
The history is stored only in your browser and never sent to a server. “Clear” deletes it at any time.