Free Online Trigonometric Calculator
Calculate sine, cosine, tangent, cotangent, secant, and cosecant instantly. Enter an angle, choose degrees or radians, and get accurate results in one click.
Tip: tangent, secant, or cosecant may be undefined at some angles.
What This Trig Calculator Does
This online trigonometric calculator is designed for students, engineers, teachers, and anyone who needs fast trig values. It computes all six standard trigonometric functions for a given angle:
- sin(θ) (sine)
- cos(θ) (cosine)
- tan(θ) (tangent)
- cot(θ) (cotangent)
- sec(θ) (secant)
- csc(θ) (cosecant)
How to Use the Calculator
Step-by-step
- Enter an angle in the input field.
- Select whether your value is in degrees or radians.
- Set your preferred decimal precision.
- Click Calculate to view all six trig values.
The results table also shows your angle in both units so you can double-check unit conversions quickly.
Degrees vs. Radians
A common source of mistakes in trigonometry is mixing angle units. If your textbook or problem gives values like 30°, 45°, or 90°, choose degrees. If values are written with π (for example, π/3 or 2π), use radians.
- 180° = π radians
- 90° = π/2 radians
- 360° = 2π radians
Why Some Results Are “Undefined”
Some trigonometric functions are not defined at specific angles. For example:
- tan(90°) is undefined because cos(90°) = 0 and tangent is sin/cos.
- sec(90°) is undefined because sec = 1/cos.
- csc(0°) is undefined because csc = 1/sin and sin(0°) = 0.
This calculator detects those cases and labels them correctly.
Practical Uses
School and Exams
Use it to check homework, verify identities, and quickly validate hand calculations before tests.
Engineering and Physics
Trigonometric values are essential for vectors, wave models, structural analysis, signal processing, and mechanics.
Computer Graphics and Game Development
Rotation, movement, camera orientation, and animation all rely on sine and cosine values.
Quick Accuracy Tips
- Always confirm your unit (degrees or radians) before calculating.
- Use 6+ decimal places for intermediate steps in longer problems.
- Round only at the final step when possible.
- Watch for undefined values near 90°, 270°, and related angles.
Final Note
If you need a simple, reliable sine cosine tangent calculator online, this tool gives you clean output and instant results with no installation or sign-up. Bookmark this page and use it whenever you need fast trigonometric calculations.