Video speed calculator
A 60-minute lecture at 1.5× takes 40 minutes. You save 20 minutes, or about 33.33% of the original time.
Video & Audiobook Playback Time
Remaining playback time
Content remaining at 1×
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Time saved
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Original total: —
Choose this speed or the next faster setting available in your player. Available speed settings vary by app and device.
Calculation breakdown
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Compare Playback Speeds
| Speed | Playback time | Time difference vs. 1× |
|---|
Playback times are rounded to the nearest second; positive times below half a second display as <1s. Small rounding differences may appear in the breakdown.
How to Use the Playback Speed Calculator
- Enter the video's or audiobook's original duration at normal speed.
- If you have started, enter how far you are along the original timeline.
- Choose a playback speed such as 1.25×, 1.5× or 2×, then calculate.
Use Playlist / chapters to add a course, a YouTube playlist or several audiobook chapters. To work backward from your schedule, choose Find a speed and enter the time you have available.
The pre-filled fields show an editable example: a one-hour video played at 1.5×. Press calculate to see its 40-minute playback time and 20-minute saving.
Audiobook speed calculator
A 10-hour book with 2 hours completed has 8 hours remaining. At 1.25×, that takes 6 hours 24 minutes.
YouTube playback speed calculator
A 25-minute YouTube video at 2× takes 12 minutes 30 seconds, excluding ads, buffering and pauses.
Playback Speed Calculator Formula
Playback speed describes how quickly the original content is played. 1× is normal speed, 2× is twice as fast, and 0.5× is half speed. Divide the content duration by the speed multiplier to find the watching or listening time.
Playback time = remaining content ÷ playback speed
Remaining content = original duration − position already completed
Time saved = remaining content at 1× − playback time
Required speed = remaining content ÷ time available
Use the same time unit throughout. For a 90-minute video at 1.5×, 90 ÷ 1.5 = 60 minutes. The saving is 90 − 60 = 30 minutes. At 0.75×, the same video takes 90 ÷ 0.75 = 120 minutes, adding 30 minutes.
Does 1.5× speed save 50% of the time?
No. A 50% increase in playback speed gives a time saving of 1 − 1 ÷ 1.5 = 33.33%. A 50% time saving requires 2× speed. At 1.25×, you save 20%; at 1.75×, about 42.86%.
How to finish within a time limit
Suppose you have 50 minutes of content left and 30 minutes available. The required speed is 50 ÷ 30 = 1.6666…×. The calculator recommends 1.67× or faster. If your player offers only 1.5× and 1.75×, choose 1.75× to meet that limit. Pauses and ads require additional time.
Audiobook Playback Speed and Listening Time
For an audiobook, use its full-length duration at 1× or the sum of the remaining chapter lengths. If you enter the full book length, the optional position field lets you subtract what you have already completed.
Some audiobook apps display a remaining time that is already adjusted for your current speed. Dividing that adjusted time again would count the speed change twice. Use original chapter durations or the original media timeline for this calculator.
For example, a complete 12-hour audiobook at 1.5× takes 8 hours without pauses. At 2×, it takes 6 hours. Choose a speed that suits the material and your ability to follow it; the result is a duration calculation, not a recommendation about comprehension.
Video and YouTube Playback Time
This video speed calculator works with the duration of a lecture, tutorial, podcast or YouTube video. It does not need access to your account or the media file. For multiple videos, paste their durations in the playlist tab, one per line.
On YouTube, open the video's Settings → Playback speed and choose an available setting. Controls and available speeds can vary by device. This page calculates the time; playback speed is changed in your video player.
References: MDN — playback rate · YouTube Help — change playback speed.
Frequently Asked Questions
How do I calculate playback time at a different speed?
Divide the original or remaining content duration by the speed multiplier. A 60-minute video at 1.5× takes 60 ÷ 1.5 = 40 minutes. Use the same time unit for both durations.
How long is a 1-hour video at 1.5× speed?
It takes 40 minutes, excluding ads, buffering and pauses. You save 20 minutes, which is about 33.33% of the original viewing time.
How long is a 10-hour audiobook at 2× speed?
A complete 10-hour audiobook takes 5 hours at 2× speed without pauses. If you have already listened to part of it, subtract that original content duration before dividing by 2.
Can I use this as a YouTube playback speed calculator?
Yes. Enter the video duration and your playback speed. For a playlist, use the Playlist / chapters tab. Enter durations manually; this calculator does not fetch YouTube links or change the player speed.
What does the already watched or listened field mean?
Enter your position on the original media timeline. For example, enter 30:00 if you are 30 minutes into a video, even if you reached that position in 15 real minutes at 2× speed.
How do I find the speed needed to finish on time?
Divide remaining content by available time. For 50 minutes remaining and 30 minutes available, the exact speed is 1.6666…×. The calculator recommends 1.67× or faster, rounded upward to meet the time limit. Choose the next faster setting if your player does not offer that exact speed.
How do I enter hours, minutes and seconds?
Use hh:mm:ss, mm:ss, or a whole number of minutes. For example, 1:30:00 means 1 hour 30 minutes, 1:30 means 1 minute 30 seconds, and 90 means 90 minutes. Use 0–59 in the seconds field and in the middle field of hh:mm:ss.
Do I need a playback speed calculator extension?
No extension, upload or sign-up is needed. Enter the duration on this page to calculate the result. To change the playback speed, use the controls in your video or audiobook player.
Does the calculation include ads, pauses or buffering?
No. It assumes constant-speed playback without interruptions. Add extra time for ads, pauses, buffering or other breaks.
Why does a slower speed show extra time instead of time saved?
A speed below 1× makes playback longer. A one-hour video at 0.75× takes 80 minutes, so the calculator shows 20 minutes of extra time.