What's the difference between a mini, midi, and full-size lathe?

Mini lathes typically have around 8"–10" swing and 12"–14" between centers, midi lathes step up to 12" swing and 16"–21" between centers, and full-size lathes run 16"–24"+ swing with heavier cast-iron beds and 2 HP-plus motors. Across the reviewers we read, midi lathes like the Jet 1221VS are the sweet spot for hobbyists, while full-size machines like the Powermatic 3520C are aimed at serious bowl turners and pros.