Podcast Audio File Size Calculator
Enter your episode length and encoding settings to see the exact file size in MB, your monthly bandwidth at any download count, and how much hosting would cost. Pick the right bitrate before you upload. Nothing uploaded.
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Bitrate comparison - same duration, all bitrates
| Bitrate | File size | Monthly bandwidth | Monthly cost |
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Learn more: audio bitrate, file size, and podcast production
How bitrate determines audio quality and file size
Audio bitrate is measured in kilobits per second (kbps). Higher bitrates mean larger files but better quality. MP3 at 128 kbps sounds acceptable for speech and conversational podcasts. Music-heavy content needs 192-256 kbps. Lossless audio (FLAC, WAV) starts at 700+ kbps. A one-hour podcast at 128 kbps is roughly 56 MB; at 192 kbps it is 84 MB. The calculator shows file size for any duration, bitrate, and format.
Why 128 kbps is the standard for most podcasts
128 kbps MP3 balances file size against quality for speech content. Listeners on mobile networks can download episodes quickly. A 30-minute episode at 128 kbps is about 28 MB - small enough to download on slower connections in under a minute. Higher bitrates don't add much perceived value for talk radio and interview shows.
Choosing format: MP3, M4A, OGG, or WAV
MP3 is most compatible and supported by all podcast players. M4A (AAC) is more efficient at same bitrate but less universally supported. OGG is free and open but even less common. WAV is uncompressed and huge. For distribution, MP3 at 128-192 kbps is the industry standard.
FAQ
How much storage for 100 episodes?
At 128 kbps and 45 minutes each, roughly 2.5 GB. At 192 kbps, about 3.75 GB. A typical podcast hosting service includes 100+ GB/month, enough for most shows.
What bitrate should I use?
128 kbps for speech/talk. 192 kbps for music-heavy content. Anything higher is rarely noticed by listeners but increases file size and bandwidth costs.
Does mono or stereo matter?
Mono uses half the bitrate of stereo for the same quality. Most talk podcasts use mono. Music podcasts use stereo.