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21st Century (United Kingdom, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for 21st Century (United Kingdom, Kindle eBooks), updated Nov 2, 2026: median price $9.99, median 270 reviews, average rating 4.3 and a KDPTop opportunity score of 15/100 (highly competitive).
| Price range (middle 50%) | $2.99 – $12.99 |
|---|---|
| Average rating | 4.3 |
| New releases (90 days) | 8% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 33% of the parent category United Kingdom (808), one of the easier corners under it.
- Its review barrier is higher than in 72% of Kindle eBooks categories: the median best seller has 270 reviews, so new books need time to build up.
- Prices spread wide: the middle half runs from $2.99 to $12.99, so budget editions and premium or boxed sets sell side by side.
Top 10 21st Century best sellers
-
Rebel King: The Making of a Monarch
by Tom Bower
- List rank#1
- Price$11.99
- Rating4.0
- Reviews1,974
-
Entitled: Read the full story of Andrew Mountbatten-Windsor and Sarah Ferguson’s fall in the Sunday Times bestselling ‘most devastating royal biography ever written’ (Daily Mail)
by Andrew Lownie
- List rank#2
- Price$9.99
- Rating4.1
- Reviews3,747
-
The Place of Tides: A Transformative Nature Memoir of Isolation, Forgiveness, and Self-Discovery on a Remote Norwegian Island
by James Rebanks
- List rank#3
- Price$19.99
- Rating4.6
- Reviews1,329
-
Orrible British True Crime Volume 12: 18 Dark Tales of British Crime, Past and Present
by Ben Oakley
- List rank#4
- Price$3.99
- Rating4.5
- Reviews2
-
Notes from a Small Island: A hilarious farewell tour of Great Britain—from foggy Dover to Loch Ness—by an American expat who called it home for 20 years
by Bill Bryson
- List rank#5
- Price$12.99
- Rating4.2
- Reviews9,679
-
The Four Wives of Windsor: The Sunday Times Bestselling Inside Story of Diana, Camilla, Catherine and Meghan – The True Power Behind The Royal Family
by Simon Vigar
- List rank#6
- Price$14.99
- Rating4.2
- Reviews201
-
Cup of Tea, Arthur?: My Extraordinary 50 Years Photographing the Royal Family, a must have for 2026
by Arthur Edwards
- List rank#7
- Price$19.99
- Reviews-
-
The Club: How the English Premier League Became the Wildest, Richest, Most Disruptive Force in Sports
- List rank#8
- Price$12.49
- Rating4.6
- Reviews1,885
-
Brothers and Wives: Inside the Private Lives of William, Kate, Harry, and Meghan
by Christopher Andersen
- List rank#9
- Price$11.99
- Rating4.2
- Reviews1,786
-
Kate!: The Courage, Grace, and Power of the Woman Who Will Be Queen
by Christopher Andersen
- List rank#10
- Price$14.99
- Rating4.5
- Reviews332
FAQ
Is 21st Century a good niche for Amazon KDP?
Its KDPTop opportunity score is 15/100, which makes it highly competitive. The median best seller has 270 reviews and sells for $9.99.
How many reviews do you need to rank in 21st Century?
The median best seller has 270 reviews, and 37% of them have fewer than 100.
What do 21st Century best sellers cost?
The median price is $9.99; half of the best sellers are priced between $2.99 and $12.99.
Can new books break into 21st Century?
8% 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.