KDP categories · Top KDP authors
Reference (Engineering, Books): Amazon KDP category data
Amazon Books Best Sellers data for Reference (Engineering, Books), updated Nov 3, 2026: median price $16.93, median 1,115 reviews, average rating 4.6 and a KDPTop opportunity score of 30/100 (highly competitive).
| Price range (middle 50%) | $11.99 – $26.17 |
|---|---|
| Average rating | 4.6 |
| New releases (90 days) | 11% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its review barrier is higher than in 86% of Books categories: the median best seller has 1,115 reviews, so new books need time to build up.
Top 10 Reference best sellers
-
The Book of Unusual Knowledge: Big Book of Fascinating Facts & Information | Hardcover Gift for Trivia Buffs, Curious Minds, Adults, Dad & Knowledge Seekers
by Publications International Ltd.
- List rank#1
- Price$10.18
- Rating4.7
- Reviews24,708
-
ARRL Ham Radio License Manual 6th Edition – Complete Study Guide with Question Pool to Pass the Technician Class Amateur Radio Exam
by ARRL Inc.
- List rank#2
- Price$32.95
- Rating4.4
- Reviews83
-
Blood in the Machine: The Origins of the Rebellion Against Big Tech
by Brian Merchant
- List rank#3
- Price$1.99
- Rating4.4
- Reviews293
-
Power and Progress: Our Thousand-Year Struggle Over Technology and Prosperity
- List rank#4
- Price$1.99
- Rating4.4
- Reviews944
-
A Mind at Play: How Claude Shannon Invented the Information Age
by Jimmy Soni
- List rank#5
- Price$1.99
- Rating4.5
- Reviews909
-
Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values – A Philosophical Travel Memoir of Personal Growth
- List rank#6
- Price$11.48
- Rating4.4
- Reviews13,979
-
Life 3.0: Being Human in the Age of Artificial Intelligence
by Max Tegmark
- List rank#7
- Price$9.22
- Rating4.4
- Reviews6,304
-
The Wright Brothers
- List rank#8
- Price$16.99
- Rating4.5
- Reviews21,450
-
Perspective Made Easy (Dover Art Instruction)
by Ernest R. Norling
- List rank#9
- Price$8.45
- Rating4.6
- Reviews5,171
-
Midnight in Chernobyl: The Untold Story of the World's Greatest Nuclear Disaster
- List rank#10
- Price$12.53
- Rating4.7
- Reviews12,185
Subcategories
Same niche in Kindle eBooks: Reference
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 30/100, which makes it highly competitive. The median best seller has 1,115 reviews and sells for $16.93.
How many reviews do you need to rank in Reference?
The median best seller has 1,115 reviews, and 21% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $16.93; half of the best sellers are priced between $11.99 and $26.17.
Can new books break into Reference?
11% 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.