What reading level is Doctor Proctor's Fart Powder?

Doctor Proctor's Fart Powder by Jo Nesbø is at a Level 4-5 reading level (Lexile 770L). Recommended for Middle Grades readers (Ages 9-12).

What age is Doctor Proctor's Fart Powder appropriate for?

Doctor Proctor's Fart Powder is recommended for Ages 9-12. HootRating: 9LP (Light — Physical).

What genre is Doctor Proctor's Fart Powder?

Doctor Proctor's Fart Powder is fiction — Juvenile Fiction.

Does Doctor Proctor's Fart Powder have any content warnings?

Doctor Proctor's Fart Powder has a HootRating of 9LP (Light — Physical). No specific content flags noted. On HootRated, every book is rated across four dimensions — emotional, physical, social, and thematic — to help parents make informed choices.

How many pages is Doctor Proctor's Fart Powder?

Doctor Proctor's Fart Powder by Jo Nesbø is 464 pages.

Reviewed by HootRated editorial · Last updated September 7, 2026

Doctor Proctor's Fart Powder

Jo Nesbø

Doctor Proctor's Fart Powder

Age Rating, Reading Level & Content Guide

Who Cut the Cheese?

by Jo Nesbø

Reading Level 4-5 9LP Ages 9-12 Balanced Read

The text is written at a 4th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is mild with minimal sensitive material.

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About This Book

What if a secret powder could make you fly—just by farting? Imagine teaming up with a quirky inventor and two brave friends to stop aliens, giant snakes, and creepy spiders from taking over your city. But can they save Oslo before the sinister waffle irons strike?

Themes

Humor AdventureInventorsExtraterrestrial beingsFriendship

Quick Assessment

This middle-grade book follows Doctor Proctor and his friends as they embark on a hilarious and imaginative adventure filled with quirky inventions and fantastical creatures. Suitable for ages 9-12, the story blends humor with mild fantastical peril in a way that encourages creativity and fun without heavy content. Parents should note the presence of some mild peril and fantasy violence, but nothing intense or graphic.

Why we rated Doctor Proctor's Fart Powder 9LP

Doctor Proctor's Fart Powder is written at a Level 4-5 reading level with a Lexile measure of 770L across 464 pages. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, Doctor Proctor's Fart Powder works for readers up to grade 6.5.

We rate Doctor Proctor's Fart Powder as 9LP ("Light — Physical") because the content sits in the "Mild" range — mild conflict — the kind a child encounters in normal play and sibling life. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly mild; no single dimension stands out as a concern.

No specific content flags were raised by community reviewers, which is consistent with the mild intensity score.

Thematically, Doctor Proctor's Fart Powder explores humor, adventure, inventors, extraterrestrial beings, and friendship — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
✓ Kids drawn to stories about humor, adventure, inventors.