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Podcast & Audio File Size Calculator

DeveloperMath

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INPUT

Auto Process

Duration

Hours

Minutes

Seconds

Audio Settings

Audio Format

Bitrate (kbps)

Channels

Sample Rate

Bit Depth

Podcast Estimates

Episodes/Month

Listeners

OUTPUT

Client Side

File Size

Estimated File Size

Format Comparison

Format	Est. Size	Quality Notes
Result will appear here

Podcast Hosting Estimates

Metric	Value
Result will appear here

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Guide

Podcast & Audio File Size Calculator

Quickly estimate how large your podcast episodes or audio files will be before recording or exporting. Enter the duration, audio format, and quality settings to get an instant file size estimate along with monthly storage and bandwidth projections for podcast hosting.

How to Use

1. Enter the audio duration using the hours, minutes, and seconds fields.
2. Select your audio format (MP3, AAC, OGG, WAV, or FLAC).
3. For compressed formats, choose the bitrate and channel configuration.
4. For lossless formats, select the sample rate and bit depth.
5. Enter the number of episodes per month and expected listeners for podcast hosting estimates.
6. Results update automatically as you change any input.

Features

Instant File Size Estimation – See the estimated file size immediately based on your format and quality settings.
Format Comparison Table – Compare file sizes across all common bitrates and lossless formats side by side.
Podcast Hosting Estimates – Calculate monthly and yearly storage needs plus bandwidth for your listener count.
Lossless vs Compressed – Understand the size difference between WAV, FLAC, and compressed formats like MP3 and AAC.
Smart Conditional Inputs – Bitrate options show for compressed formats; sample rate and bit depth show for lossless formats.

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 FAQ

How is audio file size calculated for compressed formats?

For compressed formats like MP3, AAC, and OGG, the formula is: file size (MB) = (bitrate in kbps × duration in seconds) / 8000. The bitrate determines the amount of data used per second of audio, so higher bitrates produce larger but higher-quality files.
What is the difference between lossy and lossless audio formats?

Lossy formats (MP3, AAC, OGG) permanently remove audio data that is less perceptible to human ears, resulting in smaller files. Lossless formats (WAV, FLAC) preserve every bit of the original audio. WAV is uncompressed, while FLAC uses lossless compression to reduce file size to roughly 60-70% of WAV without any quality loss.
How much bandwidth does a podcast need per month?

Monthly bandwidth depends on episode file size, release frequency, and listener count. The formula is: monthly bandwidth = file size per episode × episodes per month × number of listeners. For example, a 30-minute podcast at 128 kbps MP3 is about 28.8 MB per episode. With 4 episodes and 1,000 listeners, that is roughly 115 GB of bandwidth per month.
What bitrate should I use for my podcast?

For speech-only podcasts, 64-96 kbps mono MP3 is sufficient and keeps file sizes small. For music or high-fidelity podcasts, 128-192 kbps stereo provides a good balance between quality and size. Going above 192 kbps offers diminishing returns for most listeners, especially on mobile devices or earbuds.