KDP categories · Top KDP authors
Marine Biology (Biology, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Marine Biology (Biology, Kindle eBooks), updated Nov 2, 2026: median price $9.99, median 74 reviews, average rating 4.5 and a KDPTop opportunity score of 21/100 (highly competitive).
| Price range (middle 50%) | $6.99 – $14.19 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 4% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 8% of the parent category Biology (928), one of the easier corners under it.
- Only 4% of its best sellers are under 90 days old, fewer than in 82% of Kindle eBooks categories: established titles hold the list.
Top 10 Marine Biology best sellers
-
Scientific American September 2026
- List rank#1
- Price$6.99
- Rating4.8
- Reviews13
-
Scientific American October 2026
- List rank#2
- Price$6.99
- Rating4.2
- Reviews7
-
Scientific American June 2026
- List rank#3
- Price$6.99
- Rating4.4
- Reviews42
-
Scientific American November 2026
- List rank#4
- Price$6.99
- Reviews-
-
The Soul of an Octopus: A Surprising Exploration into the Wonder of Consciousness
- List rank#5
- Price$13.99
- Rating4.6
- Reviews11,212
-
Monarchs of the Sea: The Extraordinary 500-Million-Year History of Cephalopods
by Danna Staaf
- List rank#6
- Price$3.99
- Rating4.7
- Reviews281
-
Scientific American May 2026
- List rank#7
- Price$6.99
- Rating4.0
- Reviews1
-
Scientific American July/August 2026
- List rank#8
- Price$6.99
- Rating4.7
- Reviews8
-
Scientific American 14th April 2026
- List rank#9
- Price$6.99
- Rating4.5
- Reviews11
-
Of Orcas and Men: What Killer Whales Can Teach Us
by David Neiwert
- List rank#10
- Price$9.99
- Rating4.6
- Reviews315
Same niche in Books: Marine Biology
FAQ
Is Marine Biology a good niche for Amazon KDP?
Its KDPTop opportunity score is 21/100, which makes it highly competitive. The median best seller has 74 reviews and sells for $9.99.
How many reviews do you need to rank in Marine Biology?
The median best seller has 74 reviews, and 55% of them have fewer than 100.
What do Marine Biology best sellers cost?
The median price is $9.99; half of the best sellers are priced between $6.99 and $14.19.
Can new books break into Marine Biology?
4% 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.