Trigonometry Calculator
Sin, cos, tan, solve triangles, inverse trig & reference — all in one place
Current: 45.0000° = 0.7854 rad
0.707107+
0.707107+
1.000000+
1.414213
1.414213
1.000000
Quadrant Q1
Reference Angle45.0000°
Signs (sin / cos / tan) + / + / +
How to Use This Trigonometry Calculator
Trig Values Tab
Enter any angle in degrees or radians. Get sin, cos, tan, csc, sec and cot instantly. Use the quick buttons for common special angles.
Solve Triangle Tab
Pick a mode (SSS, SAS, ASA, or AAS), enter the known values, and the calculator finds all remaining sides and angles using the Law of Sines and Cosines.
Inverse Trig Tab
Calculate arcsin, arccos, and arctan for any valid input. Results shown in both degrees and radians (principal value range).
Reference Tab
View the CAST diagram for quadrant signs, the exact values for all 11 special angles, and 12+ grouped trigonometric identities for exam preparation.