What are BISAC codes and how do I pick the right ones?
BISAC codes are standardized category codes that classify books by subject for publishers, bookstores, and retailers. Each code has a letter prefix (like FIC for fiction) and six digits identifying the subcategory. Choosing the right BISAC codes determines which Amazon categories your book can rank in — a high-leverage decision for self-publishers.
BISAC codes (Book Industry Standards and Communications) are the standardized category codes used by publishers, bookstores, and retailers to classify books by subject. Every book has one to three BISAC codes that tell distributors what shelf the book belongs on — literally in physical bookstores, and algorithmically in online catalogs.
Each BISAC code has a letter prefix (indicating the broad subject area) followed by six digits that drill down to a specific subcategory. Examples:
BUS020000 — BUSINESS & ECONOMICS / BudgetingFIC027050 — FICTION / Romance / ContemporarySEL016000 — SELF-HELP / Personal Growth / SuccessHEA010000 — HEALTH & FITNESS / Diet & Nutrition / DietsBIO026000 — BIOGRAPHY & AUTOBIOGRAPHY / Personal MemoirsThe Book Industry Study Group (BISG) maintains the official list of ~4,000 BISAC codes and updates it annually to reflect changing retail categories.
For Amazon KDP, your BISAC codes indirectly map to the Amazon Browse Categoriesyour book is eligible to appear in. Get the codes right and your book appears in categories where it can realistically become a "Best Seller" (a target category bestseller badge is one of the most proven Amazon conversion-rate boosters). Get them wrong — pick categories that are either too competitive or irrelevant to your content — and the book drowns.
The ideal BISAC code combination picks categories that are:
KDP only lets you enter 2 BISAC codes directly. To get into additional Amazon categories, you use Amazon's separate Browse Category system (accessible via KDP Help by emailing categoryhelp@amazon.com and requesting up to 10 additional categories). This 10-category cap was tightened in 2023; authors previously could request 15+ but Amazon now pushes back on over-categorization. Most launches target a primary BISAC that matches the 80% of the book and two Amazon Browse Categories where #1 is reachable.
Example 1: A weight-loss cookbook. Primary BISAC:CKB028000 (COOKING / Health & Healing / Weight Control). Secondary BISAC:HEA006000 (HEALTH & FITNESS / Diet & Nutrition / Weight Loss). These two codes give the book distribution eligibility across cookbook retailers and health/diet retailers simultaneously. On Amazon, the author also requests browse categories "Cookbooks, Food & Wine / Special Diet / Weight Loss" and "Health, Fitness & Dieting / Diets & Weight Loss".
Example 2: A contemporary romance novel. Primary BISAC:FIC027020 (FICTION / Romance / Contemporary). Secondary BISAC:FIC044000 (FICTION / Women). The romance category on Amazon is enormous (600,000+ competing titles), so the author targets small-town and slow-burn sub-categories for reachability rather than "Romance" top-level. Hitting #1 in "Small Town & Rural Romance" or "Romance / Slow Burn" is realistic; hitting #1 in "Romance" is not.
Example 3: A business how-to guide. Primary BISAC:BUS037020 (BUSINESS & ECONOMICS / Marketing / General). Secondary:BUS019000 (BUSINESS & ECONOMICS / Entrepreneurship). The author's strategy is to rank in "Marketing & Sales" and "Small Business & Entrepreneurship" — both mid-tier categories with reachable #1s. Primary BISAC matches the 80% marketing focus; secondary captures entrepreneur readers who search "how to grow my business".
Other concepts you'll encounter alongside this one.
Longer-form resources that apply this concept in practice.
Amazon KDP lets you enter 2 BISAC codes directly. Pick one that matches the 80% of the book and a second that covers a distinct sub-audience. After launch, you can request up to 10 additional Amazon Browse Categories by emailing categoryhelp@amazon.com — but most successful launches target 3–5 categories total, not the maximum.
No. Amazon will remove your book from wrong categories, and repeated violations flag your KDP account. The goal is to pick the most relevant codes that also happen to be reachable — not to cram into high-traffic categories your book doesn't belong in. Specific and accurate usually beats broad and aspirational.
BISAC is the global industry standard used across all retailers and libraries. Amazon Browse Categories is Amazon's internal taxonomy, which maps roughly (but not 1:1) to BISAC codes. On KDP you select 2 BISACs at upload; for additional Amazon-specific categories you email categoryhelp@amazon.com after launch and request up to 10 more from their Browse taxonomy.
Start at bisg.org for the official list (~4,000 codes). Look at 10–20 comparable books in your genre on Amazon and check their categories. Tools like Publisher Rocket automate this by showing the categories and BSR for competing books, so you can target reachable ones. Pick the code that matches the core subject, then one for a distinct secondary angle.
Yes — BISAC codes on KDP are editable anytime via your Bookshelf. Amazon Browse Category requests can also be updated by emailing categoryhelp@amazon.com with new category requests and your ASIN. Many authors re-categorize 30–60 days post-launch once they see which categories drive traffic vs. which are dead.
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