Stuff I Wish I Had Known #1: Measuring Miters
This is something I struggled with for a while and only recently have been able to do the math for. Purrmaster had asked how and most of this is my response to his question. If you want the inside of the frame to be 8 inches in length then, with a board of 2 inch in width, you would add the width times 2. so with a 2 inch wide board the out side of your frame will be 12 inches. However, if you want to account for the rabbet that you set the picture into then you have to do a bit more math...