This calculator creates a semi-random round-robin schedule for up to 256 teams. For obvious reasons it will take longer to create the schedule for 256 teams, and will look silly, as there's no way the table would fit in this screen area. This is a very helpful monkey tool for the fantasy league or intramural manager who sets the schedule for the whole league.

Currently there is no functionality for the rival team, though if I feel less lazy it will in the future.