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21st Century (United States, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for 21st Century (United States, Kindle eBooks), updated Nov 3, 2026: median price $10.24, median 499 reviews, average rating 4.5 and a KDPTop opportunity score of 23/100 (highly competitive).
| Price range (middle 50%) | $3.74 – $14.70 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 20% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- 20% of its best sellers came out in the last 90 days, more than in 86% of Kindle eBooks categories: readers here keep buying new titles.
- At $10.24 its median price beats 89% of Kindle eBooks categories, leaving more margin per copy.
- Its review barrier is higher than in 80% of Kindle eBooks categories: the median best seller has 499 reviews, so new books need time to build up.
Top 10 21st Century best sellers
-
Out of the Shadows: Revealing the Truth About Non-Human Intelligent Life
by Jay Stratton
- List rank#1
- Price$14.99
- Rating4.5
- Reviews890
-
Why We're Polarized
by Ezra Klein
- List rank#2
- Price$2.99
- Rating4.6
- Reviews3,241
-
Confronting America: What Has to Change (Bill O'Reilly's Confronting Series)
- List rank#3
- Price$16.99
- Rating4.5
- Reviews316
-
The Day the World Came to Town: 9/11 in Gander, Newfoundland
by Jim DeFede
- List rank#4
- Price$7.99
- Rating4.5
- Reviews15,756
-
Man in the Mirror: Hope, Struggle, and Belonging in an American City
- List rank#5
- Price$14.99
- Rating4.2
- Reviews61
-
The Counterrevolution: The Fall and Rise of Donald Trump and the MAGA Movement
- List rank#6
- Price$19.99
- Rating4.8
- Reviews531
-
America's Golden Age: Trumpism and an Era of Limitless Possibilities
- List rank#7
- Price$14.99
- Rating4.6
- Reviews61
-
The Everywhere Millionaire: Who Is Really Rich in America and How They Got There
by Owen Zidar
- List rank#8
- Price$16.99
- Rating4.1
- Reviews112
-
To Rescue the American Spirit: Teddy Roosevelt and the Birth of a Superpower – A New York Times Bestselling Biography of Courage and Bold Presidential Leadership (The Presidential Series Book 3)
by Bret Baier
- List rank#9
- Price$16.99
- Rating4.7
- Reviews2,862
-
The Glass Box: The Shocking True Story of How CrossFit Broke the Rules, Made Millions, and Changed Fitness Forever
by Calum Marsh
- List rank#10
- Price$14.99
- Rating3.2
- Reviews8
FAQ
Is 21st Century a good niche for Amazon KDP?
Its KDPTop opportunity score is 23/100, which makes it highly competitive. The median best seller has 499 reviews and sells for $10.24.
How many reviews do you need to rank in 21st Century?
The median best seller has 499 reviews, and 22% of them have fewer than 100.
What do 21st Century best sellers cost?
The median price is $10.24; half of the best sellers are priced between $3.74 and $14.70.
Can new books break into 21st Century?
20% 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.