Use the specs from the BDS site.
The Mini 1427 is the smallest model, measuring 14.5" diameter by 27.5" tall. Comes with one cooking rack and has 6.50 inches clearance. Weighs 25 pounds. Made from 20 gauge cold rolled steel. Will fit 1 large pork butt, or 1 whole chicken, or 1 large brisket flat, or 1 large beef chuck roast, or 1 slab of ribs cut in half, and many other possible selections.