How to use
- Type an expression, or tap the keys. For example,
sin(30) + 2^10. - Choose Degrees or Radians before using sin, cos or tan.
- The answer updates as you type. Press = or Enter to save it to your recent calculations.
- Check “Answer” and the line under it, which shows how your input was read.
How the order of operations works
The calculator follows the standard order taught in schools:
- Brackets first.
- Powers (
^), worked right to left, so 2^3^2 = 2^9 = 512. - Minus signs in front of a number, after powers, so −2^2 = −4.
- × and ÷, left to right. A number next to a bracket also multiplies, so 6 ÷ 2(1 + 2) = 9.
- + and −, left to right.
% divides by 100, so 20% × 150 = 30. ! is a factorial, for whole numbers from 0 to 170.
Examples
| You type | Answer |
|---|---|
| 2 + 3 × 4 | 14 |
| 2 × (3 + 4)^2 − √16 | 94 |
| ln(e) | 1 |
| log(1000) | 3 |
| 5! | 120 |
| sin(30) in degrees | 0.5 |
| sin(30) in radians | −0.9880316241 |
Trig values to remember (degrees)
| Angle | sin | cos | tan |
|---|---|---|---|
| 0° | 0 | 1 | 0 |
| 30° | 0.5 | 0.8660254038 | 0.5773502692 |
| 45° | 0.7071067812 | 0.7071067812 | 1 |
| 60° | 0.8660254038 | 0.5 | 1.732050808 |
| 90° | 1 | 0 | Undefined |
Exact zeros, logs and inverse functions
Computers store π slightly inexactly, so sin(π) comes out as about 0.0000000000000001. We show 0 at every multiple of 90° (or π/2 radians), and an error for tan where cos is 0.
log is base 10 and ln is base e. The inverse functions sin⁻¹, cos⁻¹ and tan⁻¹ answer in the angle unit you chose: sin⁻¹(1) is 90° or about 1.5708 radians.
Working with parts of a whole? The fraction calculator keeps answers exact, and the percentage calculator handles percentage change.