△ Trigonometry Calculator

About the Trigonometry Calculator

This calculator runs entirely in your browser. Enter an angle in degrees or radians and it computes all six trigonometric functions: sin, cos, tan, csc, sec, and cot. Reciprocal functions that are undefined at the given angle (for example csc at 0°) are clearly marked.

Trigonometric function definitions

• sin(θ) — Sine: the y-coordinate of the point on the unit circle at angle θ.
• cos(θ) — Cosine: the x-coordinate of the point on the unit circle at angle θ.
• tan(θ) — Tangent: sin(θ) / cos(θ). Undefined when cos(θ) = 0 (90°, 270°, …).
• csc(θ) — Cosecant: 1 / sin(θ). Undefined when sin(θ) = 0 (0°, 180°, …).
• sec(θ) — Secant: 1 / cos(θ). Undefined when cos(θ) = 0 (90°, 270°, …).
• cot(θ) — Cotangent: cos(θ) / sin(θ). Undefined when sin(θ) = 0 (0°, 180°, …).

Degrees and radians

The two units are related by π rad = 180°. To convert degrees to radians: rad = deg × π / 180. To convert radians to degrees: deg = rad × 180 / π. Use the unit selector to choose how your input is interpreted.

How to use the calculator

1. Type the angle value (decimals and π expressions as a number are accepted, e.g. 1.5708 for π/2).
2. Choose Degrees or Radians.
3. Click Calculate. All six function values appear in a grid.

Frequently asked questions

Why are some values shown as “undefined”? Functions like tan(90°) and csc(0°) involve division by zero, which is mathematically undefined. The calculator marks these cases explicitly rather than returning Infinity.

How precise are the results? Values are rounded to 6 decimal places. Very small numbers near zero may appear as 0 due to rounding.

Can I enter negative angles? Yes. Negative angles are interpreted clockwise and produce correct signed results.

Is my input stored or uploaded? No. Everything happens in your browser. Your input is never sent to a server.