✓ Effortless Math · Free Tool

Trigonometry Calculator

Evaluate sin, cos, tan, csc, sec and cot of an angle in degrees or radians, or solve a right triangle from any two sides to find the missing side and the reference angle — with full step-by-step working.

SOH-CAH-TOA:  sin = opp/hyp,  cos = adj/hyp,  tan = opp/adj
function ( angle ) in units
opposite adjacent hypotenuse

Choose a function, type an angle, and pick degrees or radians. Undefined cases (like tan 90°) are flagged.

Enter any two of opposite, adjacent and hypotenuse; leave the third blank. The reference angle is at the vertex between the adjacent side and the hypotenuse.

Results

Result
—
—
sin
—
cos
—
tan
—
reference angle
—

Step-by-step