Measure the exact width (w) and height (h) of the outside dimensions of the image or artwork, and round up to the nearest 1/8th inch.

For example, an image size of 9 3/16" x 11 9/16" will require a 9 1/4" x 11 5/8" frame.

If you are planning to frame a canvas, measure from outside wrapped corner to outside wrapped corner.