How long is a two-hour audiobook at 1.5×?

Divide 120 minutes by 1.5 to get 80 minutes, or 1 hour 20 minutes. That saves 40 minutes compared with 1×.

Does twice the speed save twice the time?

At 2× you use half the original time and save 50%. A 100% speed increase is not a 100% reduction in duration.

Can I calculate slow playback?

Yes. Enter a custom speed greater than zero and below 1×. The tool reports the extra listening or watching time.

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Playback Speed Calculator

Find how long a video, podcast, or lecture takes at a different speed. Speeds below 1× take longer.

Original duration and speed

Enter duration as

Hours

Minutes (0–59.99…)

Playback speed

Playback time

Enter a duration and select a speed to calculate.

How does playback speed change duration?

Divide the original duration by the speed multiplier. For example, 90 minutes at 1.5× takes 60 minutes and saves 30 minutes; at 0.75×, it takes 120 minutes, adding 30 minutes. Fractions of a minute are supported and the display rounds to whole seconds.

Take this calculation further

Browse the other calculators collection for more tools in this subject.

For a related calculation, use CPS Test — Clicks Per Second to test click speed with a live counter and 1, 5, 10 or 100 second timer, then see clicks per second and an informal rating. Alternatively, use GDP Calculator to calculate GDP using the expenditure approach (C+I+G+NX). Includes per capita, real GDP, and growth rate.