I use different sized ribbon depending on the size of the bow I want
I find it works better for me.
4 in bow- 1.5 ribbon, 23 in length
3 in bow - 7/8 ribbon, 19 in length
2 in bow - 5/8 ribbon (preferred) 15 length, but I also used 3/8 and 7/8. 3/8 is more for the tiny tiny bitty bows though. Those are my measurments for the way i make pinwheels, or basic or boutique bows.