Welcome to Harry Potter Theory. Today we're discussing how Hermione Granger--and other Muggleborn witches and wizards--were able to convert their Muggle money into the magical currency accepted in the Wizarding World.
To start off with, let's take a look at the types of money we're dealing with here. The Granger family, as well as all other witches and wizards born into non-magical families, would've only had access to the Muggle currency used within their native country. Since Hermione Granger was born in England--to two successful dentists, I might add--the money her parents would've earned would've been the British pound sterling. The pound is, of course, the basic monetary unit of the United Kingdom and can be divided decimally into 100 new pence.
However, in the Wizarding World a completely different type of money is used as currency, and comes in the following three denominations: bronze Knuts, silver Sickles and golden Galleons. The most valuable of the three is--as you may have guessed--the GOLDEN Galleon, with 17 Sickles making up one Galleon, and 29 Knuts equalling one Sickle.
If you're wondering what the conversion rate is between Muggle money and Wizarding money, you're not alone. There are entire websites dedicated to this exact thing! I've taken a deep dive into some of these, and last I checked 1 Galleon was the equivalent of 5 Pounds!
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