About

AudioSpeed is an independent, free audiobook speed calculator. It estimates how long a book takes at a playback speed from 1.00x to 3.00x, and how much listening time that saves compared with 1.00x.

The estimate is arithmetic. Listening time equals the original length divided by the speed. Time saved equals the original length minus the new listening time. A 10-hour book at 1.5x takes 6h 40m and saves 3h 20m. That is about 33% less listening time. The playback itself is 50% faster than normal speed. Those are different facts, and the page keeps them separate. Results are rounded to the nearest minute.

Hours and minutes are whole numbers only: hours from 0 to 200, and minutes from 0 to 59. The calculator does not shorten 1.5 hours to 1 hour, and it does not treat 60 or 30.5 minutes as a valid minute value. Empty, zero, and negative lengths clear the previous result and show an error.

There is no company, membership, or audiobook store behind this page, and there is no team history to tell. It does not sell books and it does not connect to an Audible, Spotify, or library account. The day line assumes about 2 hours of listening per day. It is only a planning hint.

The tool does not measure whether you will understand or remember a book at a given speed. Read the FAQ for how to try a speed, and the privacy notice for analytics, hosting, and fonts.

To report a mistake, use Contact.