KDP categories · Top KDP authors
Reference (Radio, Books): Amazon KDP category data
Amazon Books Best Sellers data for Reference (Radio, Books), updated Nov 3, 2026: median price $24.98, median 10 reviews, average rating 4.5 and a KDPTop opportunity score of 24/100 (highly competitive).
| Price range (middle 50%) | $15.26 – $37.20 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 3% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 4% of the parent category Radio (265), one of the easier corners under it.
- Only 3% of its best sellers are under 90 days old, fewer than in 88% of Books categories: established titles hold the list.
- Its review barrier is lower than in 83% of Books categories: the median best seller has only 10 reviews, so new books can chart with few.
Top 10 Reference best sellers
-
1144 Random, Interesting & Fun Facts You Need To Know - The Knowledge Encyclopedia To Win Trivia (Amazing World Facts Book)
- List rank#1
- Price$14.23
- Rating4.6
- Reviews4,315
-
Ham Radio For Everyone: The Essential Guide For Beginners with Simple and Affordable Steps to Start Today
by Steve Jackson
- List rank#2
- Price$14.95
- Rating4.6
- Reviews16
-
The Complete Baofeng Radio Bible for Beginners: Fast-Track Your Path to Becoming a Baofeng Pro with an Easy-to-Follow Guide to Staying Connected Whenever It Counts Most
by Eliab Barnet
- List rank#3
- Price$9.99
- Rating4.6
- Reviews224
-
The Top 100 Classic Radio Shows
by Carl Amari
- List rank#4
- Price$31.95
- Rating4.5
- Reviews88
-
AC/DC Trivia Book: Uncover The Epic History & Facts Every Fan Needs To Know!
by Dale Raynes
- List rank#5
- Price$12.01
- Rating4.7
- Reviews196
-
Sound Reporting, Second Edition: The NPR Guide to Broadcast, Podcast and Digital Journalism
by Jerome Socolovsky
- List rank#6
- Price$20.97
- Rating5.0
- Reviews10
-
Ham Radio Portable Antennas for Beginners: Step-by-Step Setups for POTA, SOTA, and Portable Ops — Choose the Right Antenna, Deploy Fast, Tune SWR with Confidence
by Walt McKinney
- List rank#7
- Price$24.97
- Rating4.8
- Reviews117
-
Mansfield Park: A BBC Radio 4 full-cast dramatisation
by Jane Austen
- List rank#8
- Price$13.79
- Rating3.9
- Reviews9
-
Password Keeper Book For Seniors: Large Print Website Address Book Password Keeper Organizer with Alphabetized Pages - Elderly Gifts for Older Men and Women Over 70 and 80 Who Have Everything
by OldLife Press
- List rank#9
- Price$8.99
- Rating4.5
- Reviews175
-
The Music Of 1969: A weekly look at America’s top singles in the year of ‘Sugar, Sugar’, ‘Aquarius’/‘Let The Sunshine In’, ‘Something’, ‘Whole Lotta ... singles each year from 1964 to 1970 Book 6)
by Ken F. Jarrell
- List rank#10
- Price$2.99
- Rating4.8
- Reviews11
Same niche in Kindle eBooks: Reference
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 24/100, which makes it highly competitive. The median best seller has 10 reviews and sells for $24.98.
How many reviews do you need to rank in Reference?
The median best seller has 10 reviews, and 83% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $24.98; half of the best sellers are priced between $15.26 and $37.20.
Can new books break into Reference?
3% 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.