What reading level is The big machines?

The big machines by Charles A. Jortberg is at a Level 7-8 reading level. Recommended for Middle Grades readers (Ages 9-12).

What age is The big machines appropriate for?

The big machines is recommended for Ages 9-12. HootRating: 12C (Clear).

What genre is The big machines?

The big machines is nonfiction — Juvenile Nonfiction. Part of the Kids and Computers series.

Does The big machines have any content warnings?

The big machines has a HootRating of 12C (Clear). 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 The big machines?

The big machines by Charles A. Jortberg is 39 pages (approximately 3,230 words).

Reviewed by HootRated editorial · Last updated May 18, 2026

The big machines

Charles A. Jortberg

The big machines

Age Rating, Reading Level & Content Guide

by Charles A. Jortberg

Kids and Computers

Reading Level 7-8 12C Ages 9-12 Sweet Spot Page-Turner

The text is written at a 7th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.

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About This Book

Discover how computers have transformed the world in just a few decades, shaping everything from business and communication to air traffic control and space exploration. This fascinating journey reveals the powerful machines behind modern technology and their incredible impact on daily life.

Themes

Science & NatureTechnologyEducation

Quick Assessment

This is a Level 7-8 book with gentle content intensity. It's a Sweet Spot read — challenging text with gentle themes, ideal for advanced or 2e readers. No notable content concerns flagged. Written for readers ages 9-12.

Why we rated The big machines 12C

The big machines is written at a Level 7-8 reading level across 39 pages (approximately 3,230 words). Strong independent readers around grade 8.7 can typically handle this book on their own; with parent or teacher support, The big machines works for readers up to grade 9.7.

Read aloud, The big machines takes about 22 minutes, which fits within a single read-aloud session.

We rate The big machines as 12C ("Clear") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.

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

Thematically, The big machines explores science & nature, technology, and education — 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.
✓ Reluctant readers who need fast-paced, hook-heavy stories to stay engaged.
✓ Kids drawn to stories about science & nature, technology, education.
✓ Readers who fall hard for one book and want a long series to live in — there are 5 more books in the Kids and Computers series.
✓ Curious kids who prefer real-world topics over made-up stories.

Maybe not for

! Readers whose emotional readiness lags behind their decoding skills — this book's intensity outruns its reading level, a classic "gifted kid" mismatch.