Does it work on any audio format?

Yes, common formats like MP3, WAV, M4A and others are all supported for duration reading.

How precise is the reported duration?

It reads the file's exact duration down to fractions of a second, not just a rounded estimate.

Do I need to wait for the file to fully play to get its duration?

No, duration is read from the file's metadata/structure instantly, without needing to play through it.

Does Audio Duration Calculator upload my files to a server?

No. Audio Duration Calculator runs entirely in your browser using on-device processing, your files never leave your device.

Audio Duration Calculator

Check the exact duration of an audio file.

Runs in your browser

Drop an audio file here

Choose File

About this tool

A file's exact length isn't always visible without opening it in a media player first, which is slow when you just need the number — for editing a video to match, checking against a platform's time limit, or planning a podcast episode's runtime. This tool reports an audio file's exact duration instantly after you select it, without needing to open a media player.

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