Trig Calculator (sin, cos, tan)

Enter an angle to get its sine, cosine and tangent. Special angles are shown exactly.

Result

Enter values and press Calculate to see the result.

Formula

sin⁡θ=opphyp, cos⁡θ=adjhyp, tan⁡θ=sin⁡θcos⁡θ\sin\theta = \frac{\text{opp}}{\text{hyp}},\ \cos\theta = \frac{\text{adj}}{\text{hyp}},\ \tan\theta = \frac{\sin\theta}{\cos\theta}

SOH CAH TOA in a right triangle, extended to every angle by the unit circle.

How to use this calculator

  1. Enter the angle and choose degrees or radians.
  2. Multiples of 30° and 45° give exact answers; other angles give rounded decimals.

Worked example

Trig values of 30°

sin 30° = 1/2, cos 30° = √3/2, and tan 30° = sin/cos = √3/3.

Frequently asked questions

Why is tan 90° undefined?

tan = sin/cos and cos 90° = 0, so the division is undefined.

Degrees or radians?

A full turn is 360° or 2π radians. Make sure the unit matches your problem.

Learn more