Pick a sample rate (44.1 to 192 kHz), a bit depth (16-bit, 24-bit or 32-bit float) and mono or stereo, then type the length of your song or session. You get the uncompressed WAV or AIFF size per minute and in total, the bit rate, and side-by-side estimates for FLAC and MP3 at 128 to 320 kbps. Use it to plan drive space, check upload limits or see what a mastering delivery will weigh.
44.1 kHz, 16-bit stereo is 1,411.2 kbps, which is 10,584,000 bytes per minute: 10.58 MB, or 10.09 MiB as Windows shows it.
17,280,000 bytes per minute, which is 17.28 MB per minute. At 96 kHz it doubles to 34.56 MB per minute.
Multiply sample rate × (bit depth ÷ 8) × number of channels × length in seconds. The result is in bytes; divide by 1,000,000 for MB.
An MB is 1,000,000 bytes and an MiB is 1,048,576 bytes. Windows labels MiB as “MB”, so the same file looks about 5% smaller there.
FLAC is lossless and usually ends up around 50 to 60% of the WAV size, depending on how dense the music is. Quiet or simple material compresses more.
320 kbps is 40,000 bytes per second, so 2.4 MB per minute, about a quarter of a CD-quality WAV.