Scientific Calculator
A free online scientific calculator with trigonometry, logarithms, powers, roots, factorials, memory and history. It follows the order of operations and works with your keyboard too.
You can also type: digits, + − * / ^ ( ) ! %, Enter for =, Backspace to delete, Esc to clear.
How to use the calculator
Type the whole expression the way you would write it – for example 2 + 3 × 4 – and press =. The preview under the expression shows the result while you type, so you can spot a mistake before you finish. Brackets you forget to close are closed for you at the end.
The 2nd key switches the function keys to their inverses: sin becomes sin⁻¹, ln becomes eˣ, log becomes 10ˣ, x² becomes x³ and √ becomes ∛. Ans inserts the last result and the history below the keypad keeps your last eight calculations – click one to use its result again.
Order of operations
The calculator follows the standard order: brackets first, then powers and roots, then multiplication and division, and addition and subtraction last. That is why 2 + 3 × 4 = 14, not 20, and why −2² = −4: the power is applied before the minus sign. Write (−2)² if you want 4.
You can leave out the multiplication sign in front of a bracket or a constant: 2π is 6.283185307 and 3(4 + 1) is 15.
Degrees or radians
The DEG/RAD key sets the angle unit for sin, cos, tan and their inverses. In degrees, sin(30) = 0.5 and tan(45) = 1. In radians, sin(π/6) = 0.5. tan(90°) is undefined, and the calculator says so instead of showing a huge rounding error.
Percent, powers and factorials
- % divides by 100, and after a plus or minus it works like a shop till: 200 + 10% = 220 and 200 − 10% = 180.
- xʸ raises to any power: 2^10 = 1,024. ʸ√x takes any root: 3 ʸ√ 8 = 2.
- n! is the factorial: 5! = 120. For non-whole numbers it uses the gamma function, so 0.5! ≈ 0.886226925.
- EXP enters powers of ten: 6.02 EXP 23 is 6.02 × 10²³.
Memory keys
M+ adds the current result to the memory, M− subtracts it, MR puts the memory into the expression and MC clears it. A small M in the display shows that something is stored.
Keyboard shortcuts
| Key | Does |
|---|---|
| 0–9 . , | digits and decimal point |
| + − * / ^ | operations |
| ( ) ! % | brackets, factorial, percent |
| Enter | = |
| Backspace | delete the last character |
| Esc | clear everything |
Results are shown with up to 12 significant digits. Very large and very small values switch to scientific notation, such as 1.234×10¹⁸.
Frequently asked questions
Does the calculator follow the order of operations?
Yes. Brackets come first, then powers and roots, then multiplication and division, then addition and subtraction. 2 + 3 × 4 gives 14.
How do I switch between degrees and radians?
Press the DEG key. It changes to RAD and the display shows which unit is active. The setting applies to sin, cos, tan and their inverse functions.
Why does tan(90) show "Undefined"?
The tangent of 90 degrees has no value, because cos(90°) is 0 and tan = sin / cos. Many calculators show a huge number caused by rounding; this one tells you it is undefined.
Can I type on my keyboard?
Yes. Click the calculator once, then type digits and + − * / ^ ( ) ! %. Enter gives the result, Backspace deletes and Esc clears.