universes, addresses, and how many fixtures actually fit.
absolute = (universe − 1) × 512 + address · sACN and art-net both number this way in every console that matters.
the top panel converts a universe and a dmx starting address to an absolute channel and back. below it the footprint packer takes rows of fixture type, quantity and channel count, walks them from your starting address, and hands you the list to copy into the patch.
absolute = (universe − 1) × 512 + address, the way sacn and art-net number things in every console that matters. leave the no-span box ticked unless you know your gear tolerates a personality running off the end of a universe.
pack in the order you patch, and start each fixture type on a round number rather than squeezing into the last twelve channels. the gap costs nothing and saves re-addressing when four more washes appear at load-in.