dimensions in Potterverse

[Phil Vlasak]

Hi folks,
I have been trying to find how dimensions are described in the Potterverse.
In my American edition it reads:
Neville was rising straight up like a cork shot out of a bottle--twelve
feet--twenty feet.
I noticed a web site quoting the British edition as:
Neville was rising straight up like a cork shot out of a bottle - four
metres - eight metres!
But when I looked on The Harry Potter Lexicon
British/US Editions section I get:
from Goblet of Fire
American: twenty feet high
British: twenty-foot-high
from Order of the Phoenix:
American: notes stacked three-and-a-half feet high
British: three-and-a-half-feet-high stack of notes
So is the British measurements in feet or metres?

Phil