Calculate audio file size for MP3 (128, 192, 320 kbps), AAC, FLAC and WAV by duration. MB per minute, GB per hour and songs per GB. Free reference table. One hour at 128 kbps holds a nominal 57.6 MB of encoded payload, and at 320 kbps it's 144 MB. Don't multiply by the channel count again when the selected bitrate already covers the complete stream, as it normally does in an export dialog. Estimate audio file sizes for MP3, WAV, FLAC, and AAC based on duration, sample rate, and bit depth. The same hour as a 320 kbps MP3 is 144 MB. Bitrates are quoted in kilo bits per second, with kilo meaning 1,000: 320 kbps is 320,000 bits, 40,000 bytes, every second. File sizes are in bytes, eight bits each. Calculate audio file size from duration, sample rate, bit depth and channels for uncompressed WAV/AIFF, estimate FLAC and lossy MP3/AAC sizes from bitrate, see megabytes per minute and per hour, and how many songs, podcast episodes or hours fit on a card or drive. Users streaming 320kbps audio will consume data at a rate of approximately 144 MB per hour. For users on metered mobile data plans, a five-hour listening session would result in 720 MB of data usage. Calculate audio file size for MP3, WAV, FLAC, AAC and OGG. As a rule of thumb, MP3 at 128 kbps uses about 1 MB per minute, 320 kbps about 2.4 MB, and CD-quality WAV about 10.6 MB per minute.