The Miniature Hereford Club of America will not classify an animal larger than a frame ONE as a Miniature Hereford. The average size of Miniature Herefords available at the moment is between 104 and 114 cms (41″ and 45″). Australian breeders follow the same guidelines.

The Point of Rocks ranch (the Largents) have a more detailed explanation of how a frame score is determined here

	Mature Cow (3 years old)		Mature Bull (3 years old)
Frame score	Height at hip		Height at hip
	(cm)	(inches)	(cm)	(inches)
10	160	63	165	65
9	155	61	160	63
8	150	59	155	61
7	145	57	150	59
6	140	55	145	57
5	135	53	140	55
4	130	51	135	53
3	124	49	130	51
2	119	47	124	49
1	114	45	119	47
0	109	43	114	45
00	104	41	109	43
000	99	39	104	41
0000	94	37	99	39