Audio File Size Calculator

This utility calculates the size of audio files (both uncompressed, PCM/IEEE FP audio, such as “.WAV”, “.W64” “.AIFF/.AIF” and also compressed files such as MP3, WMA, AAC and OGG Vorbis), according to the recording duration and file settings you choose:

**NEW** If you’re looking for a calculator to do the opposite (i.e. calculate duration from available space), then go here.

Duration
Settings - Uncompressed (WAV, AIFF etc.)
Settings - Compressed (MP3, AAC etc.)
Uncompressed (WAV, AIFF etc.) 1411.2 kbps

0

0
Compressed (MP3, AAC etc.) 0 kbps

0

0

Enter the duration of your file in hours, minutes, seconds and milliseconds. Calculating the size of uncompressed files also requires the Sample Rate, Bit Depth and Channel information (but not the Bit Rate, which is automatically calculated). In addition to the duration, calculating the size of compressed files such as MP3 etc., requires only the Bit Rate information (in this case the Sample Rate, Bit Depth and Channel information is ignored).  For compressed files encoded with CBR (Constant Bit Rate), the displayed file size should be as accurate as possible (notwithstanding variables such as header information etc- see below). For compressed files encoded with VBR (Variable Bit Rate), the displayed file size can be slightly less accurate because in this case the bit rate can vary depending on the programme material.

Note that the file size reported by your device may vary slightly from that shown due to file allocation methods, possible differences in the amount of header information and/or the fact that some operating systems calculate hard disk space differently from others (e.g., some calculate it in binary and call 1kB 1024 bytes whilst others – and most hard drive manufacturers – calculate it in decimal and call 1kB 1000 bytes) – this calculator handles both methods.

If you find this useful and/or have any comments or suggestions then do let me know via the comment section below.

Enjoy!

22 thoughts on “Audio File Size Calculator”

  1. im trying to find out how often my RME is recording a sample pr second, im using 192 khz in 24 bit, how do I do that?

    I saw somewhere its every 2 ms, but I don’t think that’s right ?

    1. Hello Kim,

      Since your audio interface is set to record at a sample rate of 192kHz per second, then it is converting audio at a rate of 192000 samples per second.

      For specific information about your hardware, I suggest you contact RME directly.

    2. hi

      yes that’s in a full second but digital sampling doesn’t record all the time, as analog does, I think I got it now – 1/192000 x 1000 = 0,0052083333333333

      so that means it take a sample every 5 ms, someone correct me if im wrong 🙂

      1. Hi Kim,

        No, it’s MUCH more frequent than that – a sample taken only once every 5 milliseconds would result in a very inaccurate (and audibly chopped-up) digital representation of the audio!

        You have the correct calculation but you’re interpreting the result incorrectly (i.e. the result is in milliseconds, not in seconds). In fact, a simpler way to express this calculation would be 1/192 (because one second = one thousand milliseconds). Either way, the result is 0.005208333 milliseconds which is, of course, a tiny, tiny fraction of one millisecond.

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