Simple deform -> units

hi guys, just a question about the simple deform modifier:
everytime i use this, i have to guess the value…:no:
for example: using the bend (or twist…) if i want to close the circle with the mesh, i have to try a lot of values before to get the right fit.
why blender doesn’t uses the degrees in this case?
is there a quick trick to insert the right value?

I believe it uses radians
In the factor box you can convert from degrees to radians:
eg typing radians(90) would give a value of 1.571

yes, you’re right. I tried to enter 6.28318 (2*Π), and the circle closes.
anyway I will do other tests.
thank you.