Audio file size calculator
Enter a duration and format to see how big the audio file will be. Lossy formats depend only on bitrate; uncompressed WAV depends on sample rate and channels.
The formula
For MP3, AAC (M4A/M4R) and other constant-bitrate lossy formats, size in bytes = bitrate (bits per second) × seconds ÷ 8. The channel count is already included in the bitrate, so a 128 kbps mono file and a 128 kbps stereo file are the same size — the mono one simply sounds better at that bitrate. Tags and container headers add a few kilobytes.
For uncompressed WAV, size = sample rate × bytes per sample × channels × seconds, plus a 44-byte header. CD quality is 44,100 × 2 × 2 = 176,400 bytes per second (1,411 kbps).
Quick reference
| Length | MP3 128 kbps | MP3 192 kbps | MP3 320 kbps | WAV 44.1 kHz stereo |
|---|---|---|---|---|
| Notification (5 s) | 78 KB | 117 KB | 195 KB | 861 KB |
| Ringtone (30 s) | 469 KB | 703 KB | 1.14 MB | 5.05 MB |
| One minute (1 min) | 938 KB | 1.37 MB | 2.29 MB | 10.1 MB |
| Typical song (3 min) | 2.75 MB | 4.12 MB | 6.87 MB | 30.3 MB |
| One hour (60 min) | 54.9 MB | 82.4 MB | 137.3 MB | 605.6 MB |
Ringtones are tiny at any sensible bitrate, so choose quality over size: 192 kbps is a good default. Learn more in MP3 vs M4A vs WAV vs M4R, or make a file of exactly the right length with the audio trimmer.