Shohin - less than 10 inches (25 cm)
- Keshitsubu 1 - 3 inches (3 - 8 cm), miniature size, two-finger
- Shito 2 - 6 inches (5 - 15 cm), miniature size, one-palm
- Mame 5 - 8 inches (13 - 20 cm), small size, one-handed
- Komono 6 - 10 inches (15 - 25 cm), small size, one-handed
Kifu (Katadi-Mochi) - 10 - 18 inches (25 - 46 cm), medium size, one-handed
Chumono (Chuhin, Chiu) - 16 - 36 inches (41 - 91 cm), medium size, two-handed
Omono (Dai) - 30 - 48 inches (76 - 122 cm), large size, four-handed
(Wikepedia Bonsai classifications)