Count the number of children with a certain component

I'm sure its pretty easy but I can't figure it out. I found a lot of really close answers but not something as specific.

I have a object with several children. Some have a certain component (Obj_Properties) attached and other don't. I would like to get the total number of children that have the selected component.

I know if I do this:

 loadOut = transform.GetComponentsInChildren(Obj_Properties);

I get the list of the children with the component but then how can I transform that into an actual number so that I can assign it to a variable?

thanks for any help!