Media Duration Calculator
Total up the duration and storage of a batch of files, with playback-speed and storage projections.
Convert with this tool
Files stay on your device. There is no upload, no queue and no watermark, so a conversion works even with the network switched off after the page has loaded.
Supported formats & processing
| Input | Numbers you type — nothing is calculated until you change a value |
|---|---|
| Output | A live result table, recalculated on every keystroke |
| Processing | Plain arithmetic in this tab — instantaneous and offline |
About this tool
When you are planning a transfer, a backup or a publishing schedule, the useful number is the total: how many hours of audio are in this audiobook series, how much storage will 200 voice memos take, how long will it take to review them all at 1.5× speed.
Enter the file count, the average length and the bitrate, and this calculator returns the total duration, the total storage, the listening time at your chosen playback speed and the equivalent in days of continuous playback. The last figure is the one that tends to change plans.
Features
- Total duration across any number of files
- Total storage from the average bitrate
- Listening time adjusted for 1×, 1.25×, 1.5× and 2× playback
- Duration expressed in hours and in days of continuous playback
- Per-file and total figures side by side
- Works for audio, video and mixed batches
Frequently asked questions
How do I estimate a mixed batch?
Run the calculator once per format group and add the totals, since bitrates differ substantially between audio and video. Two passes give a more accurate answer than one averaged figure.
How long does it take to listen to an audiobook at 1.5×?
Divide the total duration by 1.5. A ten-hour book becomes six hours and forty minutes. At 2× it is five hours.
What does 'days of continuous playback' mean?
The total duration divided by 24 hours. It is a useful way to grasp scale: 100 hours of audio is a bit over four days of non-stop listening.
Does the storage figure include metadata?
It is based on the bitrate alone. Cover art, tags and container overhead add a small amount per file, typically a few tens of kilobytes, which matters only for very short files.