How Long Will My Audiobook Be? A Word-Count-to-Hours Guide for Authors
Introduction
Audiobook length matters for more than the listener experience. It can affect narration cost, production time, editing workload, scheduling, and the overall budget for turning a manuscript into a finished audiobook.
Fortunately, authors can make a useful estimate before recording begins. According to ACX, most performers narrate about 9,300 words per finished hour. That gives authors a practical way to estimate audiobook runtime from manuscript word count.
This guide shows you how to calculate your likely audiobook length, why the final runtime may differ from the estimate, and how finished hours affect production planning and cost.
How Long Will My Audiobook Be?
A practical estimate is:
Audiobook length in hours = manuscript word count ÷ 9,300
For example, a 93,000-word manuscript would produce an audiobook of roughly:
93,000 ÷ 9,300 = 10 hours
That does not mean every 93,000-word book will finish at exactly 10 hours. Narration pace, dialogue, dramatic pauses, chapter openings, credits, pronunciation difficulty, and performance style can all make the final audiobook slightly shorter or longer.
The formula is best used as a planning estimate rather than a guaranteed final runtime.
Use This Audiobook Length Formula
To estimate your own audiobook length:
- Find the total word count of your finished manuscript.
- Divide that number by 9,300.
- The result is the approximate number of finished audiobook hours.
For example:
- 46,500 words ÷ 9,300 = about 5 hours
- 65,100 words ÷ 9,300 = about 7 hours
- 83,700 words ÷ 9,300 = about 9 hours
- 111,600 words ÷ 9,300 = about 12 hours
If your result includes a decimal, multiply the decimal portion by 60 to estimate the remaining minutes.
For example:
75,000 ÷ 9,300 = 8.06 hours
That is approximately 8 hours and 4 minutes.
Word Count to Audiobook Hours Table
The table below gives a quick estimate using the 9,300-words-per-finished-hour guideline.
| Manuscript Word Count | Estimated Audiobook Length |
|---|---|
| 20,000 words | About 2.2 hours |
| 30,000 words | About 3.2 hours |
| 40,000 words | About 4.3 hours |
| 50,000 words | About 5.4 hours |
| 60,000 words | About 6.5 hours |
| 70,000 words | About 7.5 hours |
| 80,000 words | About 8.6 hours |
| 90,000 words | About 9.7 hours |
| 100,000 words | About 10.8 hours |
| 120,000 words | About 12.9 hours |
These are estimates rather than exact runtimes. A slower, more expressive performance can produce a longer audiobook, while a faster but still natural narration may produce a slightly shorter one.
Why Your Finished Audiobook May Be Longer or Shorter
Two books with the same word count do not always produce identical audiobook runtimes.
The final length depends partly on narration speed and partly on the type of book. Straightforward nonfiction may move at a consistent pace, while fiction with dialogue, emotional scenes, character voices, or dramatic pauses may take longer.
Other factors that can affect runtime include:
- chapter titles and section headings,
- introductions and acknowledgments,
- opening and closing credits,
- difficult names or technical terminology,
- pauses between scenes or chapters,
- quotations, lists, tables, or material that requires special treatment.
The word-count formula is therefore a planning tool, not a promise of the final runtime.
How Narration Style Affects Audiobook Length
Narration style can make a noticeable difference even when the manuscript word count stays the same.
A narrator reading a practical nonfiction book may use a steady, efficient pace. Fiction, memoir, children’s books, and dramatic works may require more pauses, changes in tone, character voices, emotional emphasis, or scene transitions.
Narration should not be rushed simply to shorten the audiobook. The goal is a clear, natural, and engaging listening experience. Reading too quickly can make the audio difficult to follow, while reading too slowly can make the performance feel unnatural.
What Does “Per Finished Hour” Mean?
In audiobook production, per finished hour, often abbreviated as PFH, refers to the length of the completed audiobook rather than the total number of hours spent producing it.
For example, if a finished audiobook is 8 hours long and the agreed rate is $200 PFH:
8 finished hours × $200 PFH = $1,600
ACX uses per-finished-hour rates for Pay-for-Production agreements. The production fee is based on the final audiobook length and the PFH rate agreed between the rights holder and producer. ACX explains its production payment models here.
One finished hour can require considerably more than one hour of work because production may include preparation, narration, retakes, editing, proofing, quality control, and mastering.
How Audiobook Length Affects Production Cost
Audiobook length has a direct effect on production cost when the narrator or producer charges by the finished hour.
For example, at $200 PFH:
- a 6-hour audiobook would cost about $1,200,
- an 8-hour audiobook would cost about $1,600,
- a 10-hour audiobook would cost about $2,000.
The final quotation can still vary because of narrator experience, technical complexity, character voices, accents, pronunciation research, editing standards, and other production requirements.
Estimating audiobook length before hiring a narrator therefore gives authors a useful starting point for comparing quotes and planning a realistic budget.
How Long Does It Take to Produce One Finished Hour?
One finished hour of audiobook does not usually mean one hour of total production work.
ACX currently advises that, for new producers, it can generally take about 5 to 7 hours to record one finished hour, with the time often decreasing as producers become more experienced with their tools and workflow. ACX also recommends allowing for the producer’s schedule when setting project deadlines.
Production work may include:
- reviewing and preparing the manuscript,
- checking pronunciations and difficult terms,
- recording the narration,
- correcting mistakes and retakes,
- editing the recorded audio,
- removing unwanted noise,
- checking the audio against the manuscript,
- mastering the files to the required technical standards.
The exact amount of work varies considerably, which is why authors should think of finished hours as the length of the final product rather than the number of working hours required to create it.
Frequently Asked Questions
How long is a 50,000-word audiobook?
Using the 9,300-words-per-finished-hour guideline:
50,000 ÷ 9,300 = about 5.4 hours
That is approximately 5 hours and 23 minutes.
How long is an 80,000-word audiobook?
80,000 ÷ 9,300 = about 8.6 hours
That is approximately 8 hours and 36 minutes.
How long is a 100,000-word audiobook?
100,000 ÷ 9,300 = about 10.8 hours
That is roughly 10 hours and 45 minutes.
How many words are in one finished audiobook hour?
A practical planning estimate is about 9,300 words per finished hour, based on ACX’s guidance. The actual figure can vary with narration pace and performance style.
Does audiobook length include credits and introductions?
Yes. Material that is spoken and included in the final production—such as introductions, acknowledgments, opening and closing credits, and other approved front or back matter—can contribute to the finished runtime.
Why is my audiobook longer than the estimate?
Your audiobook may be longer if the narrator uses a slower pace, longer pauses, expressive dialogue, character voices, dramatic timing, or additional spoken material. Technical and educational books may also require slower delivery when complex terminology, numbers, or explanations need to be read carefully.
Need Help Producing Your Audiobook?
Producing a professional audiobook involves more than reading a manuscript aloud. Narration, recording quality, editing, mastering, file preparation, and platform requirements all affect the quality of the finished product.
AB Publisher LLC provides audiobook production support for authors who want to turn their books into professionally prepared audio editions.
Whether you already have a narrator or need help planning the production process, understanding your estimated audiobook length is a useful first step in determining the likely scope, timeline, and budget of the project.
Need help preparing your book for audiobook production? Visit our Services page to learn more about AB Publisher LLC’s audiobook and publishing services, or Contact us to discuss your project.