Playback Speed Calculator

Calculate adjusted video or audio duration when speeding up or slowing down playback

Input

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Output

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What is Playback Speed Calculator

Last reviewed: April 18, 2026

Playback Speed Calculator divides the original runtime of a video or podcast by a custom speed multiplier, returning the adjusted duration and time saved.

Enter the duration in HH:MM:SS, MM:SS, or '1h 30m 15s' format followed by a multiplier like 1.25x or 2x.

Why use it

Plan how long a podcast will take at 1.75x.
Budget study time for recorded lectures.
Estimate marathon-listening durations.
Pick the right speed for commuting.
Compare time savings between speed presets.

Features

Accepts HH:MM:SS, MM:SS, or h/m/s units
Decimal speed multipliers
Returns adjusted duration and time saved
Client-side Playback Speed workflow, no servers involved
Handles slow-motion (< 1x) too

How to use Playback Speed Calculator

Paste duration + speed. e.g. '1:30:00 1.5' or '45m 2x'.
Click Run. The tool returns original, adjusted, and time saved.
Copy result. Use the adjusted duration for scheduling.

Example (before/after)

Input

1:30:00 1.5

Result

Original duration: 01:30:00
Playback speed:    1.5x
Adjusted duration: 01:00:00
Time saved:        00:30:00

Common errors

Missing speed multiplier

The last number must be the speed.

Fix: Append the speed (e.g. 1.5 or 2x).

Unrecognised format

We parse HH:MM:SS, MM:SS, and h/m/s units.

Fix: Use one of those formats for the duration.

FAQ

Which duration formats are supported?

HH:MM:SS, MM:SS, and '1h 30m 15s' style.

Can I use fractional speeds?

Yes — decimals like 1.25 or 1.75 are supported.

Does it support slow-motion?

Yes — multipliers below 1 (e.g. 0.75) return longer durations.

Does it respect original length below a minute?

Yes — short durations work fine.

Is input uploaded?

No — processing is client-side.

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