I received a drill bit gauge in the mail as a marketing offer.
It has over 30 holes in it from 1/16 to 1/2" graduated in 64ths.
If you find the proper hole to correspond to your winding check size by sliding it to the proper place on the blank and convert it to a decimal it should work.
Sizing n/s winding checks especially by mail order has always been a challange for me.