Free online trigonometry calculator. Calculate sine, cosine, tangent, cotangent, secant, and cosecant for any angle in degrees or radians. Instant results with reference tables.
| Angle | sin | cos | tan |
|---|---|---|---|
| 0° | 0 | 1 | 0 |
| 30° | 1/2 | √3/2 | 1/√3 |
| 45° | √2/2 | √2/2 | 1 |
| 60° | √3/2 | 1/2 | √3 |
| 90° | 1 | 0 | undefined |
| 180° | 0 | -1 | 0 |
| 270° | -1 | 0 | undefined |
| 360° | 0 | 1 | 0 |
This trigonometry calculator computes all six trigonometric functions for any angle you enter. Whether you need sine, cosine, tangent, cotangent, secant, or cosecant, simply enter your angle and choose degrees or radians. All calculations happen instantly in your browser — no data is sent to any server.
Trigonometry is a branch of mathematics that studies the relationships between the angles and sides of triangles. The six trigonometric functions — sine, cosine, tangent, cotangent, secant, and cosecant — describe these relationships.
Degrees and radians are two units for measuring angles. One full circle is 360° or 2π radians. To convert: radians = degrees × π / 180, and degrees = radians × 180 / π.
Tangent is defined as sin/cos. At 90°, cos(90°) = 0, so tan(90°) = sin(90°)/0 = 1/0, which is undefined (division by zero). Similarly, cot(0°), sec(90°), and csc(0°) are undefined.
Yes! Negative angles work perfectly. For example, sin(-30°) = -0.5, and cos(-45°) = cos(45°) = 0.707.
Yes, completely free. No registration, no ads, and no data collection.