Scientific Calculator - Free Online Calculator with Functions
Scientific calculator
You can type directly, too. Enter calculates.
History
How this scientific calculator works
You write the whole expression on one line, exactly as it appears in a textbook, and the calculator reads it the way mathematics reads it: brackets first, then powers, then multiplication and division, then addition and subtraction. The result updates as you type, so you can see a mistake before you finish.
Using it in three steps
- 1 Choose degrees or radians before you use sin, cos or tan - the same expression gives different answers in each mode.
- 2 Write the expression on the top line, with brackets wherever the order matters. The keypad only inserts text, so typing and tapping are interchangeable.
- 3 Press = to keep the answer. It goes into the history and becomes the start of the next expression, so you can chain calculations.
Order of operations
Two rules cause most wrong answers. Powers bind tighter than a leading minus, so −3² is −9 and not 9; write (−3)² if you mean the other one. And powers group from the right, so 2^3^2 is 2⁹, not 8². Both follow standard mathematical convention rather than the left-to-right order a simple calculator uses.
| Key | What it does |
|---|---|
| ^ | Raises to a power: 2^10 is 1024 |
| √ | Square root. Negative input has no real answer |
| ln | Natural logarithm, base e |
| log | Logarithm base 10 |
| n! | Factorial: 5! is 120. Whole numbers only |
| mod | Remainder after division: 17 mod 5 is 2 |
Nothing leaves your browser
The expression is parsed and evaluated by code running on your own device. It is never sent anywhere, and it is never handed to the browser as code to run - the calculator reads it symbol by symbol instead. That distinction matters: a calculator that executes what you type is a calculator that can be made to do more than arithmetic.