KDP categories · Top KDP authors
Space Fleet (Military, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Space Fleet (Military, Kindle eBooks), updated Nov 2, 2026: median price $4.99, median 738 reviews, average rating 4.5 and a KDPTop opportunity score of 31/100 (highly competitive).
| Price range (middle 50%) | $3.99 – $5.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 54% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- 54% of its best sellers came out in the last 90 days, more than in 99% of Kindle eBooks categories: readers here keep buying new titles.
- At $4.99 its median price is below 91% of Kindle eBooks categories, so it is a volume game.
- Its review barrier is higher than in 84% of Kindle eBooks categories: the median best seller has 738 reviews, so new books need time to build up.
Top 10 Space Fleet best sellers
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I’m a Destroyer: A Sentient AI Warship Military Sci-Fi Adventure (I, Warship Book 1)
by Sean Robins
- List rank#2
- Price$0.99
- Rating4.4
- Reviews257
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Lieutenant Year 8 (An Officer of the Union Space Fleet)
by Joe Durham
- List rank#4
- Price$3.99
- Rating4.3
- Reviews102
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We Are Legion (We Are Bob) (Bobiverse Book 1)
by Dennis Taylor
- List rank#8
- Price$9.99
- Rating4.5
- Reviews35,050
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Tavalai Rebellion: (The Spiral Wars Book 11)
by Joel Shepherd
- List rank#9
- Price$5.99
- Rating4.7
- Reviews18
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Imperial Commander: Decline and Fall of the Galactic Empire Book 8
by Andrew Moriarty
- List rank#10
- Price$7.99
- Rating4.8
- Reviews31
Same niche in Books: Space Fleet
FAQ
Is Space Fleet a good niche for Amazon KDP?
Its KDPTop opportunity score is 31/100, which makes it highly competitive. The median best seller has 738 reviews and sells for $4.99.
How many reviews do you need to rank in Space Fleet?
The median best seller has 738 reviews, and 16% of them have fewer than 100.
What do Space Fleet best sellers cost?
The median price is $4.99; half of the best sellers are priced between $3.99 and $5.99.
Can new books break into Space Fleet?
54% of the current best sellers were released in the last 90 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.