Trigonometry Calculator
Calculate sine, cosine and tangent together from an angle entered in degrees or radians.
What would you like to do next?
Compare the three primary trigonometric ratios
Enter an angle and select degrees or radians. The calculator converts as needed and displays sine, cosine and tangent together, plus a normalized degree angle for orientation. Seeing the three ratios side by side helps with triangle work, periodic models and checking calculator mode without switching between separate pages.
Recognize periodic values and near-undefined tangent
Floating-point approximations can leave tiny residuals where an exact mathematical value is zero. The tool cleans values close to zero and reports tangent as undefined when cosine is effectively zero. It does not simplify symbolic multiples of pi or prove an identity, so use exact mathematics when the distinction between an approximation and a symbolic result matters.
Frequently asked questions
Can I enter radians?
Yes. Select radians and the tool converts the input for the displayed degree reference.
When is tangent undefined?
Tangent is undefined when cosine is zero, including odd multiples of ninety degrees.
Why can decimals be very small near zero?
Browser trigonometric functions use floating-point approximations.