By Daniel Shilansky · Founder, TomeVox

Audiobook length calculator: how long will your book be?

The standard audiobook conversion rate is approximately 9,300 words per finished hour. A 60,000-word novel runs about 6.5 hours; an 80,000-word novel about 8.6 hours; 100,000 words about 10.8 hours. Use the calculator below to estimate your specific runtime — it directly affects your production tier, retail price, and platform distribution decisions.

Before you produce your audiobook, you need to know how long it will be. Runtime isn't just a curiosity — it directly affects your production cost, your retail price, your listeners' expectations, and your platform distribution decisions. A 60,000-word novel and a 100,000-word novel are in entirely different conversations when it comes to audiobook economics.

The standard conversion rate used across the audiobook industry — and the figure used by ACX (Audible's audiobook production marketplace) and most narrators when estimating project scope — is approximately 9,300 words per finished hour. This accounts for a narrator's natural pace (roughly 150–160 words per minute), pauses at chapter breaks and scene transitions, and the breathing room that makes narration sound natural.

Use the calculator below to estimate your audiobook's runtime, then read on for how that runtime affects everything from Audible pricing tiers to what you'd pay a human narrator.

How do I calculate my audiobook's runtime from word count?

How long is my audiobook based on word count?

Not sure what category your book falls into? Here are the most common book lengths, their audiobook runtime equivalents at the standard 9,300 words per finished hour, and the corresponding TomeVox pricing tier.

Key finding: A standard 60,000-word novel (~6.5 hours) fits TomeVox's early bird $49 tier. Commercial fiction at 80,000 words (~8.6 hours) falls in the $79 tier. Only books over 100,000 words reach the $99 tier — epic fantasy and long non-fiction.

Runtime estimates in the table above are based on the 9,300 words/hour industry standard and vary ±10% in practice. A literary novel with long, dense sentences reads slower than commercial fiction with short dialogue exchanges. A how-to non-fiction book with numbered lists moves faster than narrative non-fiction with extended anecdotes. Use the table as a planning guide, not an invoice.

How does audiobook runtime affect retail pricing on Audible?

Audiobook platforms — and listeners — price by the hour. Audible's pricing structure is the most important to understand because it's where most audiobook revenue comes from for indie authors:

• Under 1 hour: Listed as "less than 1 hour" — typically priced at $3.95 or equivalent credit value. Almost no viable market.
• 1–3 hours: Priced in the $6.95–$10.95 range. Perceived as short by listeners; harder to justify a full credit spend.
• 3–5 hours: Priced around $10.95–$14.95. Acceptable for shorter non-fiction, novellas, and anthologies.
• 5–10 hours: The sweet spot. Priced at $14.95 with a standard credit. Listeners feel they're getting a full book for one credit — the best value perception in the market.
• 10+ hours: Also priced at one credit for Audible members, but whispersync and non-member prices are higher. Epic length is a feature for dedicated genre readers.

The practical implication: a standard novel of 60,000 words (~6.5 hours) lands cleanly in the 5–10 hour tier. That's a full credit redemption in listeners' minds. A novella of 20,000 words (~2.2 hours) sits in the 1–3 hour bracket, which means lower perceived value and lower revenue per sale — plan your pricing accordingly, and don't list a 2-hour audiobook at $24.95.

Runtime is the single biggest factor listeners use to judge whether an audiobook is worth a credit. A book they'd happily pay for in print can feel like a rip-off as a 90-minute audio file priced at $14.95.

How does audiobook length affect narration cost?

This is where the word-count-to-runtime conversion becomes financially important, especially if you're comparing AI narration against hiring a human narrator.

Traditional narrator rates: charged per finished hour

Human narrators on platforms like ACX charge by the finished hour (PFH) — meaning the length of the completed audio, not the hours they spent recording it. Industry rates range from $150 to $400+ per finished hour, with experienced narrators averaging around $250–$300 PFH.

Key finding: Human narration costs scale linearly with runtime. A standard 80,000-word novel costs $2,150–$3,440 at professional rates. TomeVox's early bird flat fee of $49–$99 covers the same books at a fraction of the cost, with no per-hour variable and no revision charges.

Human narrator costs scale linearly with runtime. A 10-hour audiobook at $300/PFH is a $3,000 invoice. That's before editing, mastering, QA, and distribution setup. For a full cost comparison with AI narration, see our audiobook cost guide.

AI narration: flat fee by word count, not by hour

TomeVox charges by word count tier — not by finished hour. The cost is the same whether your 80,000-word novel runs 8.2 hours or 9.1 hours. This eliminates the financial uncertainty that comes with variable narration pace and means you know your cost before you upload a single page.

Key finding: TomeVox's early bird flat fee means a 100,000-word novel costs $79 regardless of whether it runs 10.2 or 11.4 hours — no per-hour variable, no revision fees, no mastering add-ons. The output is chaptered, mastered to ACX and distribution standards, and yours with full commercial rights. For context on how this fits into your full production budget, see our AI audiobook production guide.

How do you find your manuscript's word count before using the calculator?

Before you use the calculator, you need an accurate word count. Here's how to get it in the tools most authors use:

• Microsoft Word: Your word count appears in the status bar at the bottom of the screen. Click it to open a detailed count that separates body text from footnotes and endnotes.
• Google Docs: Go to Tools → Word count (or press Ctrl+Shift+C / Cmd+Shift+C). You can also highlight a section to count just that portion.
• Scrivener: Go to Project → Statistics. Scrivener will show a breakdown by draft, and you can exclude specific folders (back matter, appendices) from the total.
• LibreOffice Writer: Tools → Word Count. Shows words in selection vs. full document.

What to exclude from your count

Your audiobook word count should reflect only the content that will actually be narrated. Before entering a number in the calculator, consider excluding:

• Front matter that won't be read aloud: copyright page, ISBN/publisher info, legal disclaimers
• Back matter: bibliography, index, appendices, extensive footnotes (if not read as part of the narration)
• Acknowledgments (optional — some authors include them, some don't)
• Author bio (usually a few sentences, negligible impact on runtime)

In practice, front and back matter rarely add up to more than 1,000–2,000 words for a typical novel, so the impact on runtime is small — less than 15 minutes. For non-fiction with extensive references, the exclusion can be more meaningful.

What about very short books?

Books under 30,000 words — roughly 3.2 hours of audio — are absolutely worth producing as audiobooks. Short non-fiction is one of the fastest-growing audiobook formats: business books, how-to guides, manifestos, and self-help titles that readers want to consume on a commute rather than sitting at a desk.

The key is pricing honestly. A 2-hour audiobook listed at $24.95 will generate negative reviews regardless of how good it is. Short books should be priced at $6.95–$9.95 retail (they'll show up as one credit on Audible regardless, but the non-member list price matters for perception). Position them as quick reads, not full-length titles.

TomeVox's $49 tier handles everything up to 60,000 words — so even a 15,000-word business guide is fully covered. The economics still work: if your short non-fiction sells 50 copies at $7.95 on Apple Books (where you keep 70%), that's $278 in revenue against a $49 production cost.

What about very long books?

Books over 150,000 words — epic fantasy, multi-part narrative non-fiction, omnibus editions — run over 16 hours of audio. That's not impossible to distribute, but it comes with practical challenges.

Most audiobook platforms handle long files without issue, but listeners in some markets have bandwidth and storage constraints that make a single 10GB file frustrating. More practically: an 18-hour audiobook at a single retail price can feel overwhelming to a new listener who isn't sure they'll finish it.

Common strategies for very long books:

• Split into volumes: Distribute as Book 1 and Book 2, each priced and marketed separately. This also gives you two product listings instead of one.
• Split at natural act breaks: If your book has clear structural halves, splitting there often improves pacing perception.
• Distribute as-is for series fans: If you're writing in a genre with a dedicated fanbase who expects doorstoppers (epic fantasy, hard sci-fi), a 20-hour audiobook is a feature. Go with it.

If your manuscript is over 150,000 words and you want TomeVox to handle it, get in touch — we'll work with you on the best approach for your specific book.

Which TomeVox pricing tier matches your word count?

To tie it all together: TomeVox charges an early bird flat fee based on word count, with no per-hour pricing, no variable costs, and no royalty share. Here's the full picture:

• $49 (early bird) — up to 60,000 words / approximately 6.5 hours of audio
• $79 (early bird) — up to 100,000 words / approximately 10.8 hours of audio
• $99 (early bird) — up to 150,000 words / approximately 16.1 hours of audio

All tiers include chaptered output, audio mastered to ACX and distribution standards, and full commercial rights. No subscription. No per-revision fees. No royalty split. Upload your manuscript, choose a voice, and your finished audiobook is ready within 24 hours. For a full breakdown of how these costs compare to professional narration and royalty share, see our audiobook cost guide or our guide to making an audiobook.

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