KDP categories · Top KDP authors
Hard Science Fiction (Science Fiction, Books): Amazon KDP category data
Amazon Books Best Sellers data for Hard Science Fiction (Science Fiction, Books), updated Nov 3, 2026: median price $15.02, median 10,530 reviews, average rating 4.5 and a KDPTop opportunity score of 27/100 (highly competitive).
| Price range (middle 50%) | $9.99 – $22.30 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 12% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its review barrier is higher than in 99% of Books categories: the median best seller has 10,530 reviews, so new books need time to build up.
- Its median reviews are 34% of the parent category Science Fiction (30,843), one of the easier corners under it.
- Prices spread wide: the middle half runs from $9.99 to $22.30, so budget editions and premium or boxed sets sell side by side.
Top 10 Hard Science Fiction best sellers
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Morning Star: Book III of the Red Rising Trilogy
by Pierce Brown
- List rank#2
- Price$19.95
- Rating4.7
- Reviews62,290
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We Are Legion (We Are Bob): Bobiverse, Book 1
- List rank#4
- Price$17.99
- Rating4.5
- Reviews35,050
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For We Are Many: Bobiverse, Book 2
- List rank#5
- Price$16.36
- Rating4.6
- Reviews21,518
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Icehenge
by Kim Stanley Robinson
- List rank#7
- Price$1.99
- Rating3.9
- Reviews401
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Children of Time: Children of Time, Book 1
- List rank#8
- Price$21.99
- Rating4.5
- Reviews51,769
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There Is No Antimemetics Division: A Novel
by qntm
- List rank#9
- Price$14.95
- Rating4.3
- Reviews14,374
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Same niche in Kindle eBooks: Hard Science Fiction
FAQ
Is Hard Science Fiction a good niche for Amazon KDP?
Its KDPTop opportunity score is 27/100, which makes it highly competitive. The median best seller has 10,530 reviews and sells for $15.02.
How many reviews do you need to rank in Hard Science Fiction?
The median best seller has 10,530 reviews, and 8% of them have fewer than 100.
What do Hard Science Fiction best sellers cost?
The median price is $15.02; half of the best sellers are priced between $9.99 and $22.30.
Can new books break into Hard Science Fiction?
12% 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.