GY-521 sensor inclination detection

hi to all, I did a little research but I have few time and I would need to know how I can know the angle of my sensor GY-521.
The tutorials I have found so far would seem to describe only the input of the angular acceleration, which calculations or libraries are necessary to have a value in degrees?
Thank you

PS. Of course if i didn't explain well tell me what you need to know

Take a look at this project using the MPU6050.