Inverse Trig Calculator
Calculate inverse trigonometric functions asin, acos, and atan in DEG or RAD mode with an online scientific calculator.
Inverse trig calculator for asin, acos, and atan
This inverse trig calculator evaluates asin, acos, and atan in either degree or radian mode.
Use it to convert ratios back into angles and to check right-triangle or unit-circle calculations.
Features
- asin, acos, and atan buttons.
- DEG/RAD output mode.
- Fractions inside inverse trig functions.
- Domain errors for unsupported real inputs.
- History and copy support.
Example expressions
\operatorname{asin}(0.5)\operatorname{acos}(0.5)\operatorname{atan}(1)\operatorname{asin}\left(\frac{1}{2}\right)\operatorname{atan}\left(\frac{1}{\sqrt{3}}\right)\operatorname{acos}(1)
How to use this calculator
- Set DEG or RAD depending on the output unit you want.
- Choose asin, acos, or atan and enter the ratio.
- Use fractions for exact-looking inputs such as 1/2.
Common input mistakes
- asin and acos only accept real inputs from -1 to 1.
- atan accepts any real number, but the output still follows DEG/RAD mode.
- Do not confuse asin with 1/sin; asin means inverse sine.
FAQ
Does inverse trig return degrees or radians?
It follows the current DEG/RAD mode.
Can I use fractions inside inverse trig?
Yes. Use a fraction structure inside asin, acos, or atan.
What is atan(1) in degrees?
In DEG mode, atan(1) returns 45.
Why does asin(2) show an error?
For real-number inverse sine, the input must be between -1 and 1.