Estimating audio file sizes accurately helps independent podcasters and media producers plan hosting storage allowances and forecast CDN bandwidth costs before launching a series. This calculator evaluates episode file sizes and monthly network transfer based on duration, bitrate, and listener volume.

File sizes are determined by encoding bitrates: audio megabytes per minute = (bitrate in kbps * 60) / 8192 (where 8192 converts kilobits to megabytes). Multiplying this by episode duration gives the total episode size in MB, and multiplying by projected monthly downloads (divided by 1024) gives total monthly transfer in gigabytes. For instance, a 45-minute episode encoded at 128 kbps (standard spoken-word voice clarity) produces a file size of approximately 42.2 MB ((128 * 60 * 45) / 8192 = 42.19 MB). If that episode receives 5,000 monthly downloads, total monthly hosting transfer is (42.19 * 5000) / 1024 ≈ 206.0 GB. All math calculates locally in client-side JavaScript.