Trigonometry Calculators
Sine, cosine, tangent and the rest — in degrees, radians or multiples of π. Evaluate functions and inverses, review the ratios and see how each function behaves.
11 calculators
Most used
- Trig Functions CalculatorEvaluate all six trig functions of any angle, with exact values for special angles plus the reference angle, quadrant and coterminal angle.
- Unit Circle CalculatorEnter an angle to see it on the unit circle with its exact (cos θ, sin θ) coordinates, reference angle, quadrant and a full chart of standard angles.
Trig functions 6
- Inverse Trig Functions CalculatorFind the principal angle for any arcsin, arccos, arctan, arccsc, arcsec or arccot value, in degrees, radians and exact multiples of π.
- Polar to Rectangular ConverterConvert between polar (r, θ) and rectangular (x, y) coordinates in either direction, with exact values for special angles and a diagram.
- Reference Angle CalculatorFind the reference angle, quadrant and coterminal angles of any angle in degrees or radians, with the rule for each quadrant explained.
- Sinusoidal Function CalculatorFind the amplitude, period, phase shift, midline and key points of a sine or cosine function, or write the equation from a max, min and period.
- Trig of π CalculatorType an angle as a multiple of π and get all six trig values in exact radical form, plus degrees, quadrant and reference angle.
- Trig Functions CalculatorEvaluate all six trig functions of any angle, with exact values for special angles plus the reference angle, quadrant and coterminal angle.
Reference & graphs 5
- Inverse Trig GraphsGraph any of the six inverse trig functions, see its domain and principal range, and highlight the point for an x value you choose.
- Trig Function GraphsPlot y = A·f(B(x − C)) + D for any of the six trig functions and read off the amplitude, period, phase shift, range and asymptotes.
- Trigonometric IdentitiesEvery core trig identity in one place, with an interactive checker that evaluates both sides at any angles you choose.
- Trig Ratios (SOH-CAH-TOA)Get sine, cosine, tangent and their reciprocals from two sides of a right triangle, with a SOH-CAH-TOA diagram and exact special-angle values.
- Unit Circle CalculatorEnter an angle to see it on the unit circle with its exact (cos θ, sin θ) coordinates, reference angle, quadrant and a full chart of standard angles.
Guides
- How to Convert Degrees to Radians (and Radians to Degrees)Multiply degrees by π/180 to get radians, or radians by 180/π to get degrees. Exact forms, a full reference table and where radians are required.
- SOHCAHTOA Explained: Sine, Cosine and Tangent in Right TrianglesSOH CAH TOA names the three trig ratios of a right triangle. Learn to pick the right one, solve for sides and angles, and avoid degree-mode errors.