Audiobook length estimator.
Either type a word count or paste your manuscript. Get the estimated duration at slow (130 wpm), ACX-standard (155 wpm), and fast (180 wpm) narration speeds.
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Audiobook length questions
How long is a 100,000-word audiobook?
About 10.7 hours at the ACX-recommended pace of 155 wpm. At 130 wpm it's 12.8 hours; at 180 wpm about 9.3 hours.
What is the standard narration speed for audiobooks?
ACX, Audible's production arm, asks for 9,300–9,400 words per finished hour, which works out to about 155 words per minute.
How many words per minute do narrators read?
Professional narrators average 130–180 wpm depending on genre. Nonfiction and literary fiction trend slower (130–150); thrillers and pacy genre fiction trend faster (160–180).
Why does the ACX hours number matter?
Audible pays narrators per finished hour and lists audiobook length in hours. If you're shipping to ACX, the finished-hours number is what matters for marketing and royalty math.