I don't have a chart, but for the FireFly, the enclosed part of the firebox above the mesh floor of the stove is 3.25" wide by 3.25" deep by 3.25" high. The built-in pot supports add 0.75" more in height to the bottom or your pot, for a firebox volume of 42.25 cubic inches. If you use the "large pot supports", the pot will be raised another 1.5", giving you a firebox volume of 58 cubic inches below your pot bottom.
Coming in a couple weeks will be the yet-to-be revealed FireFly XL. This stove will have an enclosed firebox that is wider, deeper, and higher than the FireFly (4"x4"x4"), with built-in pot supports that lift your pot 2.5" higher still. The firebox volume below your pot will be 104 cubic inches.