Free Online Scientific Calculator

What this scientific calculator can do

The calculator above includes the functions you need for school, engineering and everyday maths: sin, cos, tan in degrees or radians, natural and base-10 logarithms, powers (x², x³, xʸ, eˣ, 10ˣ), square roots, factorials, modulo, absolute value and the constants π and e.

How to use it

Type a number, then press a function key such as sin or √x. The result replaces the number on the display.
For two-number operations like xʸ or mod, enter the first number, press the key, enter the second number and press =.
Press DEG / RAD to switch the angle unit. Each window keeps its own setting.
Use your keyboard for digits and the basic operators, and the history button to reuse earlier results.

Examples

Calculation	Keys	Result
sin(30°)	`30` `sin` (DEG)	0.5
log₁₀(1000)	`1000` `log`	3
2¹⁰	`2` `xʸ` `10` `=`	1,024
5!	`5` `n!`	120
17 mod 5	`17` `mod` `5` `=`	2

Read the scientific calculator guide for each function in detail, and degrees vs radians if your trig answers look wrong.

Frequently asked questions

Does the calculator use degrees or radians?

Either. Press the DEG/RAD key on the scientific keypad to switch. Degrees are the default.

Why does sin(30) show a strange number?

You are probably in radians mode. In radians, 30 means 30 radians, not 30 degrees. Switch to DEG to get 0.5.

Is it free?

Yes. There is no sign-up and calculations run in your browser.