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Karl Jacob: Amazon KDP author data
As of Nov 6, 2026, Karl Jacob has 2 books on Amazon, 2 of them on a best-seller list in the last 30 days (best rank #2), mostly in Endocrinology & Metabolism, Diets & Weight Loss, Diseases.
| Median price | $14.49 |
|---|---|
| Price range (middle 50%) | $9.74 – $19.24 |
| Median reviews | 59 |
| Total reviews | 118 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- Median price $14.49, 26% below the median of their main category, Endocrinology & Metabolism.
Karl Jacob's best-ranked books
-
Fix Your Insulin: 7 Simple Hacks to Lose Weight Without Hunger or Calorie Counting
by Karl Jacob
- Price$4.99
- Rating4.8
- Reviews59
-
Fix Your Insulin: 7 Simple Hacks to Lose Weight Without Hunger or Calorie Counting
by Karl Jacob
- Price$23.99
- Rating4.8
- Reviews59
Main categories
FAQ
How many books does Karl Jacob have on Amazon?
KDPTop tracks 2 of their books; 2 made an Amazon list in the last 30 days.
Which categories does Karl Jacob publish in?
Their books chart most often in Endocrinology & Metabolism, Diets & Weight Loss, Diseases.
How does Karl Jacob price their books?
The median price is $14.49; half of the books cost $9.74–$19.24.
Has Karl Jacob released new books recently?
0 new books in the last 30 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.