Playback Speed Calculator — Video & Audio Speed Calculator
Playback Speed Calculator
Calculate the video or podcast length with the given playback speed.
The Core Mathematical Formula
Calculated Batch Time = (Original Duration × Episode Count) ÷ Playback Speed
Total Time Saved = (Original Duration × Episode Count) − Calculated Batch Time
Find out how long a video or audio file will take at a different playback speed. Enter the original length and the speed, like 1.25x, 1.5x or 2x, and the playback speed calculator shows you the new length. It’s handy for lectures, YouTube videos, podcasts and audiobooks.
How to Use the Playback Speed Calculator
- Enter the original length of the video or audio.
- Enter the playback speed, for example 1.5.
- Read the new duration.
Playback Speed Formula
New duration = original duration ÷ playback speed.
Example: 60 minutes ÷ 1.5 = 40 minutes. Time saved = 60 − 40 = 20 minutes.
Video Length at Different Speeds (60-Minute Video)
| Playback speed | New length | Compared with normal |
|---|---|---|
| 0.5x | 120 minutes | 60 minutes longer |
| 0.75x | 80 minutes | 20 minutes longer |
| 1x | 60 minutes | No change |
| 1.25x | 48 minutes | 12 minutes shorter |
| 1.5x | 40 minutes | 20 minutes shorter |
| 1.75x | about 34 min 17 sec | about 25 min 43 sec shorter |
| 2x | 30 minutes | 30 minutes shorter |
Audio and Lecture Examples
The same formula works for audio. A 10-hour audiobook takes 8 hours at 1.25x, 6 hours 40 minutes at 1.5x and 5 hours at 2x. A 45-minute podcast takes 30 minutes at 1.5x. A 3-hour lecture takes 2 hours at 1.5x and 1 hour 30 minutes at 2x.
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Frequently Asked Questions
How do I calculate video length at 1.5x?
Divide the original length by 1.5. A 60-minute video becomes 40 minutes.
How much time do I save at 2x?
Half the original length. A 60-minute video takes 30 minutes.
Does this work for audio too?
Yes. The formula is the same for podcasts, audiobooks and any other audio.
What is playback speed?
Playback speed is a multiplier of normal speed. 1x is normal, 2x is twice as fast and 0.5x is half speed. Available speeds differ between apps, so check your player’s settings.