The Author Bio: 35, 75, and 150-Word Formulas That Work

By Tracy Atkins, founder of BookDesigner.ai and BookDesignTemplates.com · 15+ years of print files, 70,000+ authors · Updated August 22, 2026

Write the long version first

Most authors try to write the 35-word back cover bio first, then panic when they can't fit anything in. Work the other direction. Draft the full 150-word version, get every fact you want on the record, then trim it down for shorter spaces. Cutting is much easier than expanding, and the three versions will stay consistent with each other because they come from the same source paragraph.

All three lengths share the same three building blocks, used in different proportions:

• Credential or heritage line. Who you are in one clause: a job, a background, a place, an award, or simply "author of."
• Subject authority. Why you're qualified to write this book, or what your fiction is known for.
• Human detail. One small, specific, non-professional fact. A place you live, a pet, a hobby, a habit.

Longer versions add a fourth piece where there's room: a call to action pointing to a newsletter, website, or series.

The 35-word formula: back cover and byline

This is the version that sits under the blurb on your back cover, or runs as a one-line byline in an anthology. Space is the tightest constraint you'll face anywhere in the book, so it gets exactly two of the three ingredients: credential and one human detail. Subject authority gets folded into the credential line instead of stated separately.

Nonfiction example: "Jane Whitfield spent twelve years as a hospice nurse before turning to writing about grief and recovery. She lives in Vermont with two rescue dogs."

Fiction example: "Marcus Rowe writes crime novels set in the Pacific Northwest, where he has lived his whole life. He is a terrible fisherman and a decent cook."

Notice neither example has a call to action. At 35 words there's no room for one, and back cover real estate belongs to the book, not to a mailing list pitch.

The 75-word formula: Amazon author page

Amazon's author page is where most readers who look you up will land, and it has room to do real work. Use all three ingredients, in order: credential, then subject authority stated as its own sentence, then a human detail. If you write in a series or a recognizable genre, this is also the place to name it.

Nonfiction example: "Jane Whitfield spent twelve years as a hospice nurse and now writes about grief, caregiving, and the practical realities that most books skip over. Her work draws on hundreds of conversations at patients' bedsides, and on her own experience losing a parent early in her career. She lives in Vermont with two rescue dogs and an aggressively ordinary vegetable garden."

Fiction example: "Marcus Rowe writes crime novels set along the rain-soaked coast of the Pacific Northwest, where he has lived his entire life. His books follow Detective Ellen Cho through a string of small towns with large secrets, and readers have called the series atmospheric, unflinching, and hard to put down. He is a terrible fisherman, a decent cook, and owns far too many raincoats."

Note the difference in emphasis. The nonfiction bio is doing authority work: years, evidence, why this person can be trusted on the subject. The fiction bio is doing voice work: tone words, series details, personality. That split holds at every length, but it's most visible here because 75 words is enough room to actually show it.

The 150-word formula: press kit and website

This is the version for a media kit, a "meet the author" page, or a request from a podcast or blog. It's long enough to add a fourth piece: a short, specific call to action, placed last, after the human detail rather than instead of it.

Nonfiction example: "Jane Whitfield spent twelve years as a hospice nurse before turning to writing full time. Her books on grief, caregiving, and the practical realities of end-of-life care draw on hundreds of bedside conversations and on her own experience losing a parent early in her career, an experience that first convinced her the existing books on the subject weren't telling the whole truth. She has spoken at caregiver conferences across New England and consulted on hospice training materials. She lives in Vermont with two rescue dogs and an aggressively ordinary vegetable garden. Readers can find monthly essays on grief and caregiving at her website."

A fiction press bio follows the same shape, just with series history and reader reception standing in for professional credentials. The proportions matter more than the exact wording: roughly half the bio should be the authority or voice section, since that's the part doing the actual persuading.

Common mistakes across all three lengths

• Writing in first person. "I have always loved..." reads as a diary entry, not a professional bio. Third person is the convention for a reason: it reads as an introduction, not a confession.
• Front-loading achievements and skipping the human detail. A list of credentials with no personality makes the author forgettable. Even nonfiction bios need one small specific detail near the end.
• Using the same bio at every length. A 150-word bio jammed onto a back cover gets cut awkwardly by the printer's margins, or by you at the last minute under deadline pressure. Write the short version deliberately instead.
• Burying the call to action. If you include one, it should be the last sentence, short, and pointed at one destination, not three.

Related: Writing a back cover blurb that sells · Amazon book description formulas · Pricing your book