Tangent Calculator
Calculate the tangent of an angle in degrees, radians or gradians. Shows "Undefined" when the tangent does not exist.
What is Tangent?
The tangent of an angle θ is the ratio of the opposite to the adjacent side: tan(θ) = sin(θ) / cos(θ). Unlike sine and cosine, tangent is unbounded — it can take any real value.
Notable values: tan(0°) = 0, tan(30°) ≈ 0.5774, tan(45°) = 1, tan(60°) ≈ 1.7321. Tangent is undefined at 90°, 270° (and odd multiples of 90°).
Unit conversions: 1° = π/180 rad ≈ 0.01745 rad. 1 rad = 180°/π ≈ 57.296°. 400 gradians = 360°.
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