KDP categories · Top KDP authors
Reference (Diseases & Physical Ailments, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Reference (Diseases & Physical Ailments, Kindle eBooks), updated Nov 3, 2026: median price $5.99, median 32 reviews, average rating 4.5 and a KDPTop opportunity score of 19/100 (highly competitive).
| Price range (middle 50%) | $3 – $9.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 11% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 4% of the parent category Diseases & Physical Ailments (714), one of the easier corners under it.
- The same niche in Books scores 31, 12 points higher than here; worth checking both.
- Prices spread wide: the middle half runs from $3 to $9.99, so budget editions and premium or boxed sets sell side by side.
Top 10 Reference best sellers
-
5-Ingredient Keto Cookbook: Easy Healthy Ketogenic Recipes For Two (5-Ingredient Cookbooks For Two)
- List rank#1
- Price$9.99
- Rating4.4
- Reviews197
-
How To Use Amazon Pharmacy : A step by step guide to ordering your medications online
by Lindsay McCauley
- List rank#2
- Price$2.99
- Rating4.7
- Reviews31
-
![Dr. Sebi's Ultimate Herbal Bible [3 in 1]: Natural Remedies & Alkaline Detox Diet for Live book cover by Luna Harmon](https://images-na.ssl-images-amazon.com/images/I/71ALR4LORVL._AC_UL300_SR300,200_.jpg)
Dr. Sebi's Ultimate Herbal Bible [3 in 1]: Natural Remedies & Alkaline Detox Diet for Liver, Kidney, Diabetes, Hormones, Digestion, PMS & More (Dr. Sebi's Ultimate Healing Books)
by Luna Harmon
- List rank#3
- Price$0.99
- Rating4.4
- Reviews122
-
Better Energy: Why Health, Hormones, and Metabolism Depend on How Well You Turn Your Food Into Energy
by Kate Deering
- List rank#4
- Price$12.99
- Rating4.9
- Reviews28
-
Live It NOT Diet!: Eat More Not Less. Lose Fat Not Weight.
by Mike Sheridan
- List rank#5
- Price$7.99
- Rating4.4
- Reviews264
-
Home Apothecary: 250 Herbal Remedy Recipes for Healing, Self-Care, and Natural Living—Easy to Use
by Rebecca Carvell
- List rank#6
- Price$7.99
- Rating4.8
- Reviews21
-
Autophagy
by Thomas Hawthorn
- List rank#7
- Price$2.99
- Rating3.7
- Reviews209
-
The $7/Day Slow Cooker Diabetic Diet for Seniors (2026 EDITION): Simple, Healthy, Low Sugar Recipes to Support Type 2 Diabetes, Balanced Blood Sugar, and Eating Without Feeling Restricted
by Claire Whitfield
- List rank#8
- Price$1.99
- Rating5.0
- Reviews37
-
Longevity...Simplified: Living A Longer, Healthier Life Shouldn’t Be Complicated
by Howard Luks
- List rank#9
- Price$9.99
- Rating4.5
- Reviews323
-
Bariatric Bombshell: An Honest Approach to Weight Loss Surgery Success
by Stephanie Sehestedt
- List rank#10
- Price$7.99
- Rating4.6
- Reviews98
Same niche in Books: Reference
FAQ
Is Reference a good niche for Amazon KDP?
Its KDPTop opportunity score is 19/100, which makes it highly competitive. The median best seller has 32 reviews and sells for $5.99.
How many reviews do you need to rank in Reference?
The median best seller has 32 reviews, and 71% of them have fewer than 100.
What do Reference best sellers cost?
The median price is $5.99; half of the best sellers are priced between $3 and $9.99.
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.