Playback speed and time
Find how long a podcast, lecture or video takes at a chosen playback speed and compare the time saved. The savings compare it with normal speed, rather than predicting learning or comprehension.
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How it works
Formula
Input and formula key
Your result
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Sources
- MDN — playback rate multiplierSources reviewed: 2026-10-30
Assumptions and limitations
Speed is a constant multiplier. Pauses, adverts and buffering are excluded. Slower playback produces negative time savings. Clock text rounds to seconds.
How to use this tool
Set up the inputs
Enter the original duration and the playback multiplier, such as 1.5 for one and a half speed.
Worked examples
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Fit a lecture into an hour
90 min / 1.5 = 60 min; 90 − 60 = 30 min.
Frequently asked questions
How should I read the result from Playback speed and time?
The main result is the time spent playing. The savings compare it with normal speed, rather than predicting learning or comprehension.
Processing and privacy
The calculation or transformation runs in your browser. The tool does not send its input values or generated output to an application server. Loading a page still makes infrastructure requests; optional analytics and Google consent messages have separate controls.
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Help and feedback
Consult the linked sources for definitions and reference data. Contact Support if you have a question or notice a problem.
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