Jag kan ge dig en liten bit mer info. Vi vet att Grawp - Hagrids bror - är ganska liten:
See, with giantesses, what counts is producin' good big kids, and he's always been on a bit on the runty side fer a giant - on'y sixteen foot -'
Harry Potter and the Order of the Phoenix - p.609 - Bloomsbury - Chapter 30, Grawp
Så det är inte orimligt att övertyga om att Fridwulfa (Hagrids mor) kan ha varit en relativt kort jätte, med jättarna Hagrid såg 20-25 fot:
När det gäller Hagrids pappa kan jag dessutom säga att när Hagrid var ungefär sju eller åtta meter lång var hans pappa tillräckligt kort för att sitta på axeln:'How big are they?' asked Ron in a hushed voice.
''Bout twenty feet,' said Hagrid casually. 'Some o' the bigger ones mighta bin twenty-five.'
Harry Potter and the Order of the Phoenix - p.377 - Bloomsbury - Chapter 20, Hagrid's Tale
Hagrid got up, went over to his dresser, opened a drawer and pulled out a picture of a short wizard with Hagrid's crinkled black eyes, beaming as he sat on top of Hagrid's shoulder. Hagrid was a good seven or eight feet tall, judging by the apple tree beside him, but his face was beardless, young, round and smooth - he looked hardly older than eleven.
'Tha' was taken jus' after I got inter Hogwarts,' said Hagrid, croakily.
Harry Potter and the Goblet of Fire - p.395 - Bloomsbury - Chapter 24, Rita Skeeter's Scoop