Scientific calculator

Type straight into the display or use the keypad. The calculator reads maths the way it's written in a textbook:

• $2\pi r$ can be typed as 2pi r, and 3(4+5) multiplies.
• sin 30 means $\sin(30)$, and sin^2 x means $(\sin x)^2$.
• ln is the natural log and log is base 10. For any other base, use log(8, 2) for $\log_2 8$.
• 5! is a factorial, e is Euler's number and Ans is the last answer.

Press Enter (or =) to evaluate. The Up and Down arrow keys step through your history, and Esc clears the line.

Angles are in degrees when DEG is on, and in radians when RAD is on. Most school geometry and engineering problems use degrees; calculus uses radians.

A quick check: $\sin 30$ should be $0.5$ in degrees. If you get $-0.988$, the calculator is in radians.

Answers are shown to 10 significant figures, with floating-point noise removed (so $0.1 + 0.2$ shows as $0.3$). Very large and very small results switch to scientific notation, like $6.022\times10^{23}$.

Where a result isn't a real number, such as $\sqrt{-1}$ or $\ln(-2)$, the calculator says it's undefined rather than giving a misleading value.