Trigonometry
Sine Calculator
Calculate sin(θ) for any angle in degrees or radians, with exact values for special angles and the related reciprocal function.
sin θ = opposite / hypotenuse
Also called sin calculator · sin of angle
Math · 12 calculators
Trigonometry Calculators
Sine, cosine, tangent and their inverses, the laws of sines and cosines, right triangles and angle conversion.
Trigonometry
Cosine Calculator
Calculate cos(θ) for any angle in degrees or radians, with exact values for special angles and the related reciprocal function.
cos θ = adjacent / hypotenuse
Also called cos calculator · cos of angle
Trigonometry
Tangent Calculator
Calculate tan(θ) for any angle in degrees or radians, with exact values for special angles and the related reciprocal function.
tan θ = opposite / adjacent = sin θ / cos…
Also called tan calculator · tan of angle
Trigonometry
Inverse Sine Calculator
Find the angle whose sin is x (sin⁻¹ or arcsin) in degrees and radians, with the principal range explained.
θ = sin⁻¹(x)
Also called arcsin · sin^-1
Trigonometry
Inverse Cosine Calculator
Find the angle whose cos is x (cos⁻¹ or arccos) in degrees and radians, with the principal range explained.
θ = cos⁻¹(x)
Also called arccos · cos^-1
Trigonometry
Inverse Tangent Calculator
Find the angle whose tan is x (tan⁻¹ or arctan) in degrees and radians, with the principal range explained.
θ = tan⁻¹(x)
Also called arctan · tan^-1
Trigonometry
Trigonometric Functions Calculator
All six trig functions — sin, cos, tan, csc, sec and cot — for one angle, plus the quadrant and reference angle.
csc = 1/sin
Also called trig calculator · all trig functions
Trigonometry
Law of Sines Calculator
Solve a triangle with the law of sines from two angles and a side (AAS/ASA): all sides, angles and the area.
a / sin A = b / sin B = c / sin C
Also called sine rule · law of sines
Trigonometry
Law of Cosines Calculator
Find the third side of a triangle from two sides and the included angle (SAS) with the law of cosines, plus the remaining angles.
c² = a² + b² − 2ab·cos C
Also called cosine rule · sas triangle
Trigonometry
Right Triangle Calculator
Solve a right triangle from two legs: hypotenuse, both acute angles, area, perimeter and altitude to the hypotenuse.
SOH CAH TOA
Also called right angle triangle · right triangle solver
Trigonometry
Degrees to Radians Converter
Convert degrees to radians, including an exact multiple of π for common angles like 45° = π/4.
rad = deg × π / 180
Also called deg to rad · degree to radian
Trigonometry
Radians to Degrees Converter
Convert radians to degrees, minutes and seconds. Accepts expressions like pi/6.
deg = rad × 180 / π
Also called rad to deg · radian to degree
Key trigonometry formulas
| Sine | sin θ = opposite / hypotenuse |
|---|---|
| Cosine | cos θ = adjacent / hypotenuse |
| Tangent | tan θ = opposite / adjacent = sin θ / cos θ |
| Inverse Sine | θ = sin⁻¹(x) |
| Inverse Cosine | θ = cos⁻¹(x) |
| Inverse Tangent | θ = tan⁻¹(x) |
| Trigonometric Functions | csc = 1/sin · sec = 1/cos · cot = 1/tan |
| Law of Sines | a / sin A = b / sin B = c / sin C |
| Law of Cosines | c² = a² + b² − 2ab·cos C |
| Right Triangle | SOH CAH TOA · c = √(a² + b²) |