Audio Bit Rate and File Size Calculators
If it seems a mystery just how large that audio file will be, here is just the tool you need to calculate audio file sizes. The first part of the calculator computes the bit rate for uncompressed audio (for example, WAVE or BWF file sizes). The second part computes the file size for a given bit rate. Use this calculator together with our FTP Transfer Time Calculator to compute your expected FTP upload and download times.
Audio Bit Rate Calculator
Inputs are sample rate (Hz), bit depth (bits), and the number of channels (mono = 1, stereo = 2, multi-track > 2). Examples of typical values are:
CD Audio - 44,100 Hz sample rate, 16-bit word depth, 2-channel (stereo)
DAT - 48,000 Hz sample rate, 16-bit word depth, 2-channel (stereo)
BWF - Although this can be any sample rate and bit depth supported by WAVE, the most common values are 96,000 Hz sample rate, 24-bit word depth, 2-channel (stereo)
With the above information, you can also compute the file size if you know the duration of your audio (number of minutes) and have one or more files of about the same duration.
Audio File Size Calculator
Inputs are bit rate (kbps or kilobits-per-second), audio duration (minutes), and the number of files with about the same duration. Examples of bit rate are:
MP3 files can be compressed using a constant bit rate (CBR) or variable bit rate (VBR). The File Size Calculator is accurate for CBR files, but VBR files will be slightly different (usually a bit smaller) than CBR files. As of March 2012, we increased the precision of the calculator by 1000x from 0.1 minute (6 seconds) to 0.0001 minute (6 msec). Your actual file size will be slightly different from the calculated file size due to time precision (within 6 msec), and the calculator does not account for the size of additional headers or ID3 tags.
Apple iTunes (standard) - 128 kbps
Apple iTunes (high bit-rate) - 256 kbps
CD Audio - 1411.2 kbps
BWF - 4608 kbps