Audio File Size Calculator

Calculate the file size of uncompressed (WAV) or compressed (MP3/AAC) audio from duration, sample rate, bit depth and channels, free online.

Format

Duration (minutes)

Sample rate (Hz) — for WAV

Bit depth — for WAV

Channels — for WAV

Bitrate (kbps) — for compressed

About this calculator

Uncompressed PCM size = sample rate × bit depth × channels × seconds ÷ 8. CD quality (44.1 kHz, 16-bit, stereo) is 10.1 MB per minute. Compressed formats use a fixed bitrate: size = bitrate × seconds ÷ 8 (320 kbps MP3 ≈ 2.4 MB per minute). FLAC typically saves ~40–50%.