Trigonometry · free · no sign-up
Tan calculator
Find the tangent of an angle in degrees or radians.
Tan calculator
Enter your values below and press Calculate to see your result instantly.
tan (
)
Resultant Trigonometric Value
1.0000
SINE / COSINE INTERSECT
Equal Vectors
COTANGENT LIMIT (cot)
1.0000
Calculations complete.
About the Tan calculator
Find the tangent of an angle in degrees or radians.
How to use the Tan calculator
- Enter the angle and choose Degrees (°) or Radians (rad).
- Press Calculate Tangent.
Formula and method
tan θ = opposite ÷ adjacent = sin θ ÷ cos θ. It is undefined at 90° and 270°.
Worked example
tan 45° = 1 and tan 60° ≈ 1.732.
Tips
- Tangent grows without limit as the angle approaches 90°.
- The slope of a line equals the tangent of its angle.
Frequently asked questions
Why is tan 90° undefined?
Because cos 90° is zero, and dividing by zero is not defined.