Scientific Calculator

A scientific calculator in your browser, for the moments your own isn’t in reach. Type or tap an expression, choose degrees or radians, and press equals. It follows the order of operations, handles trig, powers, roots, logs and factorials, and keeps your last few answers on screen.

How to Use It

1. Type an expression in the Expression box, or tap it out on the keypad.
2. Choose Degrees or Radians for trig.
3. Press =, Calculate or Enter to see the answer.
4. Tap Ans to reuse your last answer in a new expression.

How It Works

The calculator follows the standard order of operations:

1. Parentheses and functions such as sin( ) and sqrt( ).
2. Factorials (!) and percentages (%).
3. Powers (^), worked right to left: $2^{3^2} = 2^9 = 512$.
4. A leading minus sign: $-2^2 = -(2^2) = -4$.
5. Multiplication and division, left to right. A number next to a parenthesis or π multiplies: $2\pi$, $3(4 + 1)$.
6. Addition and subtraction, left to right.

In degrees, the trig functions use exact values at multiples of 90°, so $\sin 180° = 0$ exactly and $\tan 90°$ is reported as undefined rather than a huge number.

Worked Example

Work out $2\sin(30°) + \sqrt{16}$ in degrees:

Typed, that’s 2sin(30) + sqrt(16).

Tips and Common Mistakes

• Check the angle mode. A trig answer that looks wrong is usually degrees versus radians.
• Close every parenthesis. Functions need them: sqrt(16), not sqrt 16.
• Watch the minus sign on powers. Type (−2)^2 for 4; −2^2 is −4.
• Use parentheses for fractions. 1/(2 + 3) is 0.2, but 1/2 + 3 is 3.5.
• Other roots are powers. The cube root of 27 is 27^(1/3), or cbrt(27).