KDP categories · Top KDP authors
Roland Ennos: Amazon KDP author data
As of Nov 6, 2026, Roland Ennos has 6 books on Amazon, 6 of them on a best-seller list in the last 30 days (best rank #4), mostly in Biophysics, Geophysics, Botany.
| Median price | $13.51 |
|---|---|
| Price range (middle 50%) | $10.24 – $13.97 |
| Median reviews | 26 |
| Total reviews | 945 |
| New books (30 days) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 100% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $13.51, 70% below the median of their main category, Biophysics.
Roland Ennos's best-ranked books
-
The Age of Wood: Our Most Useful Material and the Construction of Civilization
by Roland Ennos
- Price$2.99
- Rating4.4
- Reviews432
-
The Science of Spin: How Rotational Forces Affect Everything from Your Body to Jet Engines to the Weather
by Roland Ennos
- Price$13.92
- Rating4.3
- Reviews26
-
The Age of Wood: Our Most Useful Material and the Construction of Civilization
by Roland Ennos
- Price$16.39
- Rating4.4
- Reviews432
-
-
The Science of Spin: How Rotational Forces Affect Everything from Your Body to Jet Engines to the Weather
by Roland Ennos
- Price$13.99
- Rating4.3
- Reviews26
-
The Science of Spin: How Rotational Forces Affect Everything from Your Body to Jet Engines to the Weather
by Roland Ennos
- Price$13.09
- Rating4.3
- Reviews26
Main categories
FAQ
How many books does Roland Ennos have on Amazon?
KDPTop tracks 6 of their books; 6 made an Amazon list in the last 30 days.
Which categories does Roland Ennos publish in?
Their books chart most often in Biophysics, Geophysics, Botany.
How does Roland Ennos price their books?
The median price is $13.51; half of the books cost $10.24–$13.97.
Has Roland Ennos 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.