KDP categories · Top KDP authors
Reference (Science & Math, Books): Amazon KDP category data
Amazon Books Best Sellers data for Reference (Science & Math, Books), updated Nov 3, 2026: median price $15.19, median 384 reviews, average rating 4.6 and a KDPTop opportunity score of 23/100 (highly competitive).
| Price range (middle 50%) | $10.47 – $21.68 |
|---|---|
| Average rating | 4.6 |
| New releases (90 days) | 7% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 8% of the parent category Science & Math (4,833), one of the easier corners under it.
- Its review barrier is higher than in 73% of Books categories: the median best seller has 384 reviews, so new books need time to build up.
Top 10 Reference best sellers
-
The Pleasure of Finding Things Out: The Best Short Works of Richard P. Feynman
- List rank#1
- Price$1.99
- Rating4.6
- Reviews1,017
-
The Demon-Haunted World: Science as a Candle in the Dark
by Carl Sagan
- List rank#2
- Price$21.19
- Rating4.7
- Reviews7,825
-
Cosmos: A Personal Voyage
by Carl Sagan
- List rank#3
- Price$21.66
- Rating4.7
- Reviews8,789
-
Scientific American September 2026
- List rank#4
- Price$6.99
- Rating4.8
- Reviews13
-
Thing Explainer: Complicated Stuff in Simple Words ― A Simple Illustrated Guide to How Things Work
- List rank#5
- Price$13.04
- Rating4.5
- Reviews4,928
-
Scientific American October 2026
- List rank#6
- Price$6.99
- Rating4.2
- Reviews7
-
Pale Blue Dot: A Vision of the Human Future in Space
by Carl Sagan
- List rank#7
- Price$18.49
- Rating4.7
- Reviews2,846
-
Chemistry: a QuickStudy Laminated Reference Guide (QuickStudy Academic)
by Mark Jackson PhD
- List rank#8
- Price$6.49
- Rating4.6
- Reviews3,153
-
What If? 10th Anniversary Edition: Serious Scientific Answers to Absurd Hypothetical Questions―An Annotated and Illustrated 10th Anniversary Edition of a Masterpiece of Accessible Scientific Inquiry
- List rank#9
- Price$16.43
- Rating4.6
- Reviews18,803
-
Biology: a QuickStudy Laminated Reference Guide (Quick Study Academic)
by Randy Brooks PhD
- List rank#10
- Price$8.34
- Rating4.7
- Reviews2,499
Same niche in Kindle eBooks: Reference
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 23/100, which makes it highly competitive. The median best seller has 384 reviews and sells for $15.19.
How many reviews do you need to rank in Reference?
The median best seller has 384 reviews, and 23% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $15.19; half of the best sellers are priced between $10.47 and $21.68.
Can new books break into Reference?
7% 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.