Audio File Size & Bandwidth Calculator

Determine the exact file size and monthly hosting bandwidth for MP3, WAV, and AAC podcast episodes.

Audio & File Parameters

Episode Length (Minutes)45 minutes
Monthly Downloads / Bandwidth Audience5,000 downloads
Mid-Tier Pro Host Plan128 kbps
Single Episode File Size
41.2 MB
MP3 (128 kbps CBR - Podcast Standard)
Monthly Server Bandwidth201.2 GB / mo
Data Per Listener41.2 MB
Bitrate EfficiencyHigh (Fast streaming over 4G/5G)
Apple/Spotify Feed Recommendation✓ Safe for RSS feed distribution
Tip: Most top 100 podcasts publish in 128 kbps CBR (Constant Bitrate) for the best balance of fidelity and load speed.
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Optimizing Audio Bitrates for Global Podcast Distribution

Selecting the proper audio encoding bitrate for your podcast is a delicate balance between acoustic fidelity and download friction. Delivering an unnecessarily massive file can cause mobile listeners to abandon downloads or exceed your monthly hosting bandwidth limits.

Recommended Podcast Bitrates

  • 64 kbps Mono MP3: Ideal for interview and spoken-word shows with zero background music. Keeps file sizes under 25 MB per hour with crystal-clear voice clarity.
  • 96 kbps Mono MP3: High-definition spoken-word standard used by broadcast journalists (NPR, BBC).
  • 128 kbps Stereo MP3: The global standard for shows featuring music, rich sound design, and multiple co-hosts. Balances pristine quality with universal streaming speed.
  • 192 kbps+ Stereo MP3: Reserved for complex audio dramas, orchestral soundscapes, or musical performance podcasts.

CBR (Constant) vs. VBR (Variable) Bitrate

Always export podcast episodes using CBR (Constant Bitrate). While VBR saves small amounts of disk space by reducing bitrate during silence, older in-car entertainment systems and mobile podcast scrubbers can miscalculate the total duration of VBR files, causing playback to freeze unexpectedly.