18x18 has an aspect ratio of 1:1. A typical 18x18 frame will cover 1/4 inch of your image all around, resulting in a view window of 17.5x17.5. If you would like a mat to complement your frame, visit our 18x18 Cut Mats. With a mat, an 18x18 frame works best for artwork from 9x9 to 14x14.
Learn more about measuring for a frame