Sine, Cosine & Tangent Calculator
Calculate sin, cos, and tan for any angle in degrees or radians.
Enter Angle
Choose degrees or radians
Results
Enter an angle and click calculate.
About sin, cos, and tan
For a right triangle with angle θ: sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse, and tan θ = opposite/adjacent.
These ratios depend only on the angle, not the size of the triangle. They are fundamental to almost every area of trigonometry, physics, and engineering.
Frequently Asked Questions
How do I find sin, cos, and tan of an angle?▾
Enter the angle (in degrees or radians) and click calculate. The tool returns sin, cos, and tan to 6 decimal places using IEEE-754 floating point math.
What is the difference between degrees and radians?▾
Degrees divide a circle into 360 parts; radians measure the arc length on a unit circle. 180° equals π radians, so 1 rad ≈ 57.2958°.
Why is tan(90°) undefined?▾
Tangent equals sin/cos. At 90°, cos is zero, so the division is undefined and the result tends toward infinity.
What are common values to remember?▾
sin 30° = 0.5, sin 45° = √2/2 ≈ 0.707, sin 60° = √3/2 ≈ 0.866, cos 30° = √3/2, cos 60° = 0.5, tan 45° = 1.