Free calculator
Audiobook Length & Narration Calculator
Turn a word count into finished audiobook hours, studio time and narration cost at your quoted per-finished-hour (PFH) rate.
—Finished length
—Silent reading
—Production time
—Narration cost
How it works
Audiobook narration averages about 150–160 words per minute, or roughly 9,300 words per finished hour. Recording and editing take several times the finished length.
ACX requires one chapter per file, 192 kbps+ CBR MP3 at 44.1 kHz, RMS −23 to −18 dB, peaks under −3 dB and a noise floor below −60 dB.
Frequently asked questions
How long is an audiobook of 90,000 words?
Around 9.5–10 hours at typical narration speed.