Arithmancy (class)

Arithmancy
Class information
Professor	Septima Vector
Classroom	Classroom 7A
Required textbooks	Numerology and Grammatica

"Oh, it's wonderful! It's my favourite subject!"

— Hermione Granger

Arithmancy was an elective subject offered from the third year on at Hogwarts School of Witchcraft and Wizardry. During the 1990s at least, the class was taught by Professor Septima Vector in Classroom 7A, on the Castle's seventh floor. Homework assignments, which included writing essays, required the consultation and/or composition of complex number charts. Little else is known about the class, but the study of Arithmancy has been described as "predicting the future using numbers," with "bit of numerology" as well.

Arithmancy was [[Hermione Granger's favourite subject at Hogwarts. She once told Harry Potter it was "wonderful" when he remarked that her challenging homework looked "terrible." However, one of her dorm-mates said that, in her opinion, it was difficult, and by far preferred Care of Magical Creatures.

An O.W.L. in the subject was necessary to apply for a Curse Breaker position at Gringotts.

Textbooks

• Numerology and Grammatica

Known Professors

The Arithmancy teacher, Septima Vector.

• Septima Vector

Known O.W.L.s

• Barty Crouch Jr.
• Bill Weasley
• Bridget Wenlock (presumably)
• Hermione Granger
• Percy Weasley
• Septima Vector (presumably)
• Ginger Gryffindor (possibly)

Behind the scenes

• In Harry Potter and the Order of the Phoenix, Hermione mentions Arithmancy telling Ron that she passed.
• Hermione also mentions the subject a lot of times in Harry Potter and the Prisoner of Azkaban. She says that she signed up for Arithmancy and constantly refers to it.