KDP categories · Top KDP authors
R G Roberts: Amazon KDP author data
As of Nov 6, 2026, R G Roberts has 113 books on Amazon, 6 of them on a best-seller list in the last 30 days (best rank #15), mostly in Military, Sea Adventures, Suspense.
| Median price | $4.99 |
|---|---|
| Price range (middle 50%) | $2.99 – $4.99 |
| Median reviews | 186 |
| Total reviews | 14,688 |
| New listings (30 days, incl. new editions) | 5 |
| Breakout books (30 days) | 1 |
What stands out
- Only 5% of the catalog charted in the last 30 days; sales rest on a few titles.
- Median price $4.99, 17% below the median of their main category, Military.
- 5 new listings in the last 30 days (new editions included), 1 of them broke into a Best Sellers list.
R G Roberts's best-ranked books
-
Sei dir selbst treu (U-Boot-Krieg) (German Edition)
by R G Roberts
- Price$4.99
- Reviews-
-
Aljava vazia (Guerra dos submarinos) (Portuguese Edition)
by R G Roberts
- Price$2.99
- Reviews-
-
Cardinal Virtues: War of the Submarine: Book 1
by R G Roberts
- Price$0
- Rating4.4
- Reviews1,303
- Published2022-02
-
Cardinal Virtues (War of the Submarine)
by R G Roberts
- Price$12.67
- Rating4.4
- Reviews1,303
- Published2022-01
-
I Will Try: War of the Submarine: Book 4
by R G Roberts
- Price$4.99
- Rating4.8
- Reviews1,216
-
Fortune Favors the Bold: War of the Submarine: Book 5
by R G Roberts
- Price$4.99
- Rating4.7
- Reviews1,200
-
Before the Storm: War of the Submarine: Book 0
by R G Roberts
- Price$2.99
- Rating4.1
- Reviews1,195
-
The War No One Wanted: War of the Submarine: Book 2
by R G Roberts
- Price$4.99
- Rating4.5
- Reviews1,129
-
Fire When Ready: War of the Submarine: Book 3
by R G Roberts
- Price$4.99
- Rating4.5
- Reviews1,115
-
To Thine Own Self Be True: War of the Submarine: Book 8
by R G Roberts
- Price$4.99
- Rating4.6
- Reviews888
Main categories
FAQ
How many books does R G Roberts have on Amazon?
KDPTop tracks 113 of their books; 6 made an Amazon list in the last 30 days.
Which categories does R G Roberts publish in?
Their books chart most often in Military, Sea Adventures, Suspense.
How does R G Roberts price their books?
The median price is $4.99; half of the books cost $2.99–$4.99.
Has R G Roberts released new books recently?
5 new books in the last 30 days, 1 of which reached a Best Sellers list.
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.