Scientific Calculator
This free scientific calculator handles brackets, powers, roots, logarithms and trigonometry in one place. Moreover, it follows the correct order of operations, so you can type a full expression and trust the answer. Use it for homework, exam practice and everyday sums.
Free Scientific Calculator
You can also type on your keyboard. Press Enter for the answer and Esc to clear.
How to Use This Calculator
- First, choose DEG or RAD for angles. The calculator starts in degrees.
- Next, type your expression with the keypad or your keyboard. Function keys such as sin or log open a bracket for you.
- Then press = to see the final answer. A live preview also appears while you type.
- Finally, use Ans to reuse the last answer, or tap an item in History to bring a result back.
Scientific Calculator Keys and Functions
Next, here is what each group of keys does.
| Key | What it does | Example |
|---|---|---|
| √ | Square root | √(144) = 12 |
| xy, x2 | Raise a number to a power | 2^10 = 1024 |
| 1/x | Reciprocal of a number | 4^(-1) = 0.25 |
| sin, cos, tan | Trigonometric functions (DEG or RAD) | sin(30) = 0.5 |
| sin-1, cos-1, tan-1 | Inverse trigonometric functions | asin(0.5) = 30 |
| log | Base-10 logarithm | log(1000) = 3 |
| ln | Natural logarithm (base e) | ln(e) = 1 |
| exp, 10x | e to the power x, and 10 to the power x | 10^(2) = 100 |
| x! | Factorial of a whole number | 5! = 120 |
| % | Percent (divides by 100) | 50% = 0.5 |
| π, e | The constants pi and e | 2π = 6.28318530718 |
| abs | Absolute value | abs(-7) = 7 |
Worked Examples
Next, try these worked examples in the calculator above.
In DEG mode
= 0.5
Two to the power of ten
= 1024
Square root of 144
= 12
Base-10 logarithm
= 3
5 × 4 × 3 × 2 × 1
= 120
Multiplication comes first
= 14
Order of Operations Explained
This calculator solves brackets first, then powers and roots, then multiplication and division, and finally addition and subtraction. Therefore, 2 + 3 × 4 gives 14, not 20. Add brackets whenever you want a different order, for example (2 + 3) × 4 = 20.
To learn more, read about the order of operations or how these calculators work on Wikipedia. Also, results are rounded to 12 significant digits, and angles use degrees unless you switch to RAD.
Scientific Calculator FAQ
Is this calculator free?
Yes. It is free to use, and it needs no account. Moreover, it works on phones, tablets and computers.
Does it use degrees or radians?
It starts in degrees. However, you can use the DEG and RAD switch above the keypad to change the angle mode for sin, cos, tan, asin, acos and atan.
What is the difference between log and ln?
The log key is the base-10 logarithm, so log(1000) is 3. In contrast, the ln key is the natural logarithm, which uses the number e, so ln(e) is 1.
How do I calculate a power or a square root?
Press the xʸ key to raise a number to a power. For example, 2^10 gives 1024. To find a square root, press the √ key, so √(144) gives 12.
Does it follow the order of operations?
Yes. It works out brackets first, then powers, then multiplication and division, and finally addition and subtraction.
Why does the calculator show an error?
An error appears when the expression cannot be solved. For example, you may divide by zero, take the square root or logarithm of a negative number, or leave an expression incomplete.
The results are for general information. Therefore, please check important figures before you use them.