|"Is this all real? Or has this been happening inside my head?"
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Unlike their fellow Muggles, the British wizarding community, at the time led by Minister Nobby Leach, simply ignored the change, as they were not averse to laborious calculations which they could, after all, do magically. That being said, wizards and witches weigh in ounces, pounds and stones; measure in inches, feet and miles; and pay for goods in Knuts, Sickles, and Galleons.
Behind the scenes
- After objecting to her publisher's policy of converting all measurements into metric, J. K. Rowling was invited to join the British Weights and Measures Association, which opposes the compulsory use of the metric system. Although she has nothing against the metric system, she decided to join just to elicit an reaction from her sister Di and said that she doubts "whether anyone has ever had as much fun for the price of a postage stamp."
- Pottermore (First mentioned)