Arithmancy (class)

Arithmancy
Class information
Professor	Septima Vector
Classroom	Classroom 7A
Required textbooks	Numerology and Grammatica
Required equipment	Books Parchment Quill

Harry Potter: "Arithmancy looks terrible."

Hermione Granger: "Oh no, it's wonderful! It's my favourite subject!"

— Harry Potter and Hermione Granger in her third year discussing Arithmancy

Arithmancy was an elective subject offered from the third year on at Hogwarts School of Witchcraft and Wizardry as well as at Ilvermorny School of Witchcraft and Wizardry. During the 1990s at least, the class was taught by Professor Septima Vector in Classroom 7A, on the Hogwarts Castle's seventh floor.

Little 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.

Class information

Homework assignments, which included writing essays, required the consultation and/or composition of complicated number charts.

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 roommates said that, in her opinion, it was difficult, and by far preferred Care of Magical Creatures.

Another subject, Advanced Arithmancy Studies, was taught at Hogwarts, presumably to the most intelligent and brilliant students. It may have been taught by Professor Vector also, and the Advanced Arithmancy Studies classroom was located on the first floor of the Hogwarts Turris Magnus in Hogwarts Castle.

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

Required textbooks

Numerology and Grammatica

Known professors

• Septima Vector

Grades

Passing Grades Outstanding [O] Exceeds Expectations [E] Acceptable [A]

Fail Grades Poor [P] Dreadful [D] Troll [T]

Known O.W.L.s

Ben Copper

Hermione Granger

Gethsemane Prickle

Septima Vector

Bill Weasley

Percy Weasley

Bridget Wenlock (presumably)

Known N.E.W.T.s

Gethsemane Prickle

Behind the scenes

• In the GBC versions of Harry Potter and the Philosopher's Stone and Harry Potter and the Chamber of Secrets, the Arithmancy classroom features a multiplication chart and a blackboard with a simple equation on it.

Appearances

• Harry Potter and the Philosopher's Stone (video game) (First appearance) (GBC version only) (Mentioned in console versions)
• Harry Potter and the Chamber of Secrets (First mentioned)
• Harry Potter and the Chamber of Secrets (video game) (GBC version only) (Mentioned in console versions)
• Harry Potter and the Prisoner of Azkaban (First mentioned)
• Harry Potter and the Goblet of Fire (Mentioned only)
• Harry Potter and the Order of the Phoenix (Mentioned only)
• Harry Potter and the Order of the Phoenix (video game) (Mentioned only)
• Harry Potter and the Half-Blood Prince (Mentioned only)
• Pottermore (Mentioned only)
• Wizarding World (Mentioned only)
• Fantastic Beasts: Cases from the Wizarding World (Mentioned only)
• Harry Potter: Hogwarts Mystery (Mentioned only)
• Harry Potter: Wizards Unite (Mentioned only)