Degree Radian Calculator
Use DEG/RAD mode to calculate trigonometric expressions in degrees or radians with an online scientific calculator.
Degree and radian calculator for trig expressions
This degree radian calculator helps you evaluate trigonometric expressions in the correct angle mode.
Use DEG for degree problems and RAD for radian formulas, then enter sin, cos, tan, or inverse trig functions.
Features
- Clear DEG/RAD mode toggle.
- Trigonometry and inverse trigonometry support.
- Degree-mark expressions such as 30°.
- Examples for identities and angle checks.
- Mode-aware inverse trig output.
Example expressions
\sin(30^\circ)\sin(\frac{\pi}{6})\cos(\pi)\tan(45^\circ)\operatorname{atan}(1)\cos(90^\circ)
How to use this calculator
- Set the angle mode before typing a trig expression.
- Use DEG for values written in degrees and RAD for values written with pi.
- Check the result and switch modes if it does not match the unit of your problem.
Common input mistakes
- sin(30) in DEG mode and sin(30) in RAD mode are different calculations.
- Use RAD mode for expressions such as pi/6 or cos(pi).
- A degree symbol converts the marked value to degrees even when the mode is RAD.
FAQ
What does DEG mean?
DEG means the calculator interprets trig inputs as degrees.
What does RAD mean?
RAD means the calculator interprets trig inputs as radians.
Why did I get the wrong trig answer?
The most common cause is using the wrong angle mode for the problem.
What mode should I use for pi?
Use RAD mode when your input uses pi or radian fractions such as pi/6.