Size is the term used to dictate how big or small a monster is. The new size scale was first incorporated into Monster Hunter Freedom, where, in the hunter's card shows only the largest size of all the monsters they defeated. In subsequent games monsters of the greatest and smallest size recieve a gold crown, placed next to the name of the monster in the hunter's card. In MHF1, as well as all following games, fairly large monsters will receive silver crowns.
Subspecies are not included in this list. This however, changes in Monster Hunter Portable 3rd, where each subspecies has their own list.
Some monsters vary in size from quest to quest. This list goes according to the sizes most frequently observed.
Raviente and its subspecies are currently the largest monsters in the Monster Hunter universe, easily the size of a small island. So large that they do, in fact, get their own category.
Specific Crowns
These are the particular sizes of some monsters when they hit a certain crown limit.
Monster
Silver Crown
Gold Crown
Cephadrome
1815.2 and larger
1876.7 and larger
Yian Kut - Ku
1048.6 and larger
1122.2 and larger
Blue Yian Kut - Ku
1048.6 and larger
1122.2 and larger
Gypceros
1196.2 and larger
1267.1 and larger
Purple Gypceros
1196.2 and larger
1267.1 and larger
Rathalos
1857.5 and larger
2069.3 and larger
Azure Rathalos
1857.5 and larger
2069.3 and larger
Silver Rathalos
1857.5 and larger
2069.3 and larger
Rathian
1941.8 and larger
2122.8 and larger
Pink Rathian
1941.8 and larger
2122.8 and larger
Gold Rathian
1941.8 and larger
2122.8 and larger
Khezu
1030.4 and larger
1178.8 and larger
Red Khezu
1030.4 and larger
1178.8 and larger
Plesioth
2847.7 and larger
3102.4 and larger
Green Plesioth
2847.7 and larger
3102.4 and larger
Basarios
1531.2 and larger
1673.9 and larger
Gravios
2582.9 and larger
2834.9 and larger
Black Gravios
2582.9 and larger
2834.9 and larger
Monoblos
2324.9 and larger
2545.3 and larger
White Monoblos
2324.9 and larger
2545.3 and larger
Diablos
2451.9 and larger
2770.8 and larger
Black Diablos
2451.9 and larger
2770.8 and larger
Lao - Shan Lung
Unknown
Unknown
Ashen Lao - Shan Lung
Unknown
Unknown
Kirin
603.6 and larger
821.8 and larger
Yian Garuga
Unknown
1351.5 and larger
Trivia
It is interesting to note that monsters appear considerably larger in Monster Hunter Frontier than in any other game.
Some quests require you to hunt unusually small versions of medium and large monsters, such as the Yian Kut-Ku, Khezu and Uragaan.