How to measure for a flush cut spoon ring! . First, measure the thickness of the spoon in millimeters. Then, look up the inside diameter (also in millimeters) of the size ring you want to make. With spoon rings, I always use the diameter for a quarter size larger than my target size. Add the thickness and inside diameter together, take that total and multiply by 3.14 π. And then you have the length you need to cut. It's also important to sand the piece to the measurement too as just cutting isn'