How to determine the correct size of a buttonhole

I am going to post instructions for making bound buttonholes.  First you need to determine the correct size for the buttonhole that you will be making. 

Do this by taking the button you have chosen and fold your fabric around the button.  Place a pin in the fabric and then remove the button.  Measure from the pin to the fold of the fabric. 

This is the size of the buttonhole that you need to make for that specific button and your chosen fabric.  The correct size buttonhole in the photo above is 3/4".