KDP categories · Top KDP authors
Reference (Diseases & Physical Ailments, Books): Amazon KDP category data
Amazon Books Best Sellers data for Reference (Diseases & Physical Ailments, Books), updated Nov 2, 2026: median price $15.99, median 56 reviews, average rating 4.5 and a KDPTop opportunity score of 31/100 (highly competitive).
| Price range (middle 50%) | $12.33 – $21.93 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 6% |
| Books on the list | 108 |
| Store | Books |
What stands out
- Its median reviews are 2% of the parent category Diseases & Physical Ailments (2,378), one of the easier corners under it.
- The same niche in Kindle eBooks scores 19, 12 points lower than here.
Top 10 Reference best sellers
-
Glucose Revolution: The Life-Changing Power of Balancing Your Blood Sugar
- List rank#1
- Price$16.60
- Rating4.7
- Reviews11,069
-
The Survival Medicine Handbook: THE essential guide for when medical help is NOT on the way
by Joseph Alton MD
- List rank#2
- Price$28.77
- Rating4.8
- Reviews1,907
-
Dr. Royal Rife’s Healing Frequencies: Unlock the Secrets of Rife Machines to Cure Cancer,Aids,Lyme Disease with Clear Details of Listed Frequency for All Causes
by Vickie Huynh
- List rank#3
- Price$9.99
- Rating4.4
- Reviews104
-
The Blood Sugar Freedom Formula: Type 1 Diabetes, Simplified
by Matt Vande Vegte
- List rank#4
- Price$19.97
- Rating4.5
- Reviews315
-
5-Ingredient Keto Cookbook: Easy Healthy Ketogenic Recipes For Two (5-Ingredient Cookbooks For Two)
- List rank#5
- Price$9.99
- Rating4.4
- Reviews197
-
Reverse Chronic Kidney Disease: How To Improve Kidney Function And Avoid Dialysis
by Dr. Yaw Ababio Boateng
- List rank#6
- Price$14.99
- Rating4.6
- Reviews718
-
The Ozempic Revolution: A Doctor’s Proven Plan for Success to Help You Reverse Obesity, End Yo-Yo Dieting, and Protect Yourself from Disease
by Alexandra Sowa
- List rank#7
- Price$16
- Rating4.6
- Reviews327
-
The Disease Delusion: Conquering the Causes of Chronic Illness for a Healthier, Longer, and Happier Life
by Jeffrey S. Bland
- List rank#8
- Price$11.24
- Rating4.6
- Reviews763
-
Vaccines and the Diseases They Target: An Analysis of Vaccine Safety and Epidemiology
by Physicians for Informed Consent
- List rank#9
- Price$19.48
- Rating4.8
- Reviews122
-
Mayo Clinic Family Health Book, 5th Ed: Completely Revised and Updated
by Scott Litin M.D.
- List rank#10
- Price$38.13
- Rating4.8
- Reviews552
Same niche in Kindle eBooks: Reference
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 31/100, which makes it highly competitive. The median best seller has 56 reviews and sells for $15.99.
How many reviews do you need to rank in Reference?
The median best seller has 56 reviews, and 53% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $15.99; half of the best sellers are priced between $12.33 and $21.93.
Can new books break into Reference?
6% 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.