KDP categories · Top KDP authors
Science Fiction (Romance, Books): Amazon KDP category data
Amazon Books Best Sellers data for Science Fiction (Romance, Books), updated Nov 2, 2026: median price $4.99, median 4,052 reviews, average rating 4.4 and a KDPTop opportunity score of 24/100 (highly competitive).
| Price range (middle 50%) | $3.99 – $7.60 |
|---|---|
| Average rating | 4.4 |
| New releases (90 days) | 33% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 11% of the parent category Romance (35,578), one of the easier corners under it.
- 33% of its best sellers came out in the last 90 days, more than in 98% of Books categories: readers here keep buying new titles.
- Its review barrier is higher than in 96% of Books categories: the median best seller has 4,052 reviews, so new books need time to build up.
Top 10 Science Fiction best sellers
-
Daggermouth (The Heart Duology Book 1)
by H. M. Wolfe
- List rank#1
- Price$11.99
- Rating4.6
- Reviews52,905
-
The One (Expanded Edition): The Million-Copy International Bestseller – Now with Five Chapters of Exclusive Bonus Content (Dark Future Book 1)
by John Marrs
- List rank#2
- Price$12.99
- Rating4.2
- Reviews71,851
-
Under the Iron Sky
by A. T. Emerald
- List rank#3
- Price$21.99
- Rating4.6
- Reviews527
-
The Wildborn: A Sci-Fi Alien Romance (The Starborn Series Book 1)
by Perri Torani
- List rank#4
- Price$3.99
- Rating4.4
- Reviews2,266
-
-
This Is How You Lose the Time War
by Amal El-Mohtar
- List rank#6
- Price$13.99
- Rating4.2
- Reviews20,594
-
Dark Destiny: The Turning Of The Loom (The Children Of The Gods Paranormal Romance Book 112)
by I. T. Lucas
- List rank#7
- Price$4.99
- Rating4.8
- Reviews1,103
-
-
Kingdom of Ash (Throne of Glass, 7)
- List rank#9
- Price$12.70
- Rating4.8
- Reviews172,169
-
Barbarian Alien: A SciFi Alien Romance (Ice Planet Barbarians Book 2)
by Ruby Dixon
- List rank#10
- Price$3.99
- Rating4.2
- Reviews32,357
Same niche in Kindle eBooks: Science Fiction
FAQ
Is Science Fiction a good niche for Amazon KDP?
Its KDPTop opportunity score is 24/100, which makes it highly competitive. The median best seller has 4,052 reviews and sells for $4.99.
How many reviews do you need to rank in Science Fiction?
The median best seller has 4,052 reviews, and 15% of them have fewer than 100.
What do Science Fiction best sellers cost?
The median price is $4.99; half of the best sellers are priced between $3.99 and $7.60.
Can new books break into Science Fiction?
33% 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.