Amazon Book Categories — Free KDP Category Checker

The entry bar for 14 low-content categories

Median review count of the titles ranked in each Amazon Best Sellers category — the number of reviews a typical competing book already has. Lower means easier to enter.

Collected from Amazon.com Best Sellers on 9 October 2026 by Craftific's data pipeline. Scores are 0–100; demand data is not yet included, so scores currently reflect competition.

Insight: The calendar number is a reminder to read the context, not just the score. Calendars look easy because every edition is new each year — they also only sell for a few months. A low entry bar in a seasonal category is an opportunity with a deadline.

How to read the score fairly

• It measures competition, not sales. A score of 70 means ranked titles carry fewer reviews than in a 50 category; it says nothing about how many copies sell.
• It is a shortlist, not a verdict. Use it to choose which categories to research by hand. Open the category's Best Sellers page, look at the top 20 covers and prices, and ask whether your book would look at home and better there.
• Medians beat averages. One runaway best seller with 40,000 reviews would drag an average far above what most competing books carry. The median shows the typical book you have to beat.
• Dates matter. Each result shows when the data was collected. Best Sellers lists move daily; the entry bar moves slowly, so a few weeks' age is fine for this purpose.
• Demand will be added. When demand data is collected for a category, the score will blend it in at 60% weight and the result will say so.

How KDP categories work

1. Three per format. During paperback setup, KDP asks you to choose up to three categories from Amazon's browse tree. The ebook and hardcover choose their own.
2. Rankings are per category. A book can be #50 in a broad category and #3 in a narrow one. The narrow ranking is the one that earns a "#1 Best Seller" badge and visibility on that list.
3. Relevance decides conversion. Shoppers browsing a category expect what it says. A book in the wrong place gets views and no sales.
4. You can change them. Categories can be edited later from the book's details; changes take effect after review. Change them when the book's audience becomes clearer from its reviews, not every week.

Choosing categories for a low-content book

1. List every category your book truly fits. A gratitude journal fits Guided Journals, Journal Writing Self-Help and possibly a Mindfulness category.
2. Check the entry bar for each one with the tool above.
3. Pick one specific, lower-bar category where a new book can rank — this is where visibility comes from.
4. Add the most relevant broad category — it brings browsing buyers even if you rank lower.
5. Use the third for the next-best fit, often a niche audience category such as nurses, teachers or new mothers.
6. Match your keywords to the categories. KDP's seven keyword boxes should use the same words buyers use in those categories.

Example: three category sets

Category mistakes that hold books back

Choosing only the biggest categories. A new book in Journal Writing Self-Help competes with titles carrying a median of 2,242 reviews; without a specific category alongside it, it will not be seen.

Choosing irrelevant categories to rank. Ranking briefly in a category your buyers do not browse brings no sales and can confuse Amazon's recommendations.

Ignoring the season. Calendars and dated planners need to be live months before the year starts.

Never revisiting. Check categories every few months; a book with reviews can move up to a broader category.

Splitting one audience across three similar categories. Three near-identical categories reach the same shoppers three times. Use the third slot for a different angle — an audience, a theme or a use — so the book is found by a new group of buyers.

From category to finished book

Pick a trim with KDP trim sizes, design the interior from Craftific's KDP journal interior templates, size the cover with the KDP cover calculator, and price it with the KDP royalty calculator. For niche ideas, see the best KDP niches for 2026, and for the whole process, the KDP publishing guide.