オーディオファイルサイズ計算機
ガイド
オーディオファイルサイズ計算機
Calculate the exact file size of audio recordings based on format, bitrate, duration, and quality settings. Supports MP3, AAC, OGG Vorbis, WAV, and FLAC with configurable bitrate, sample rate, bit depth, and channel count. Includes a podcast hosting estimator for monthly storage and bandwidth, a quality comparison table showing all bitrates side by side, and a WAV vs compressed format comparison.
使い方
Set the audio duration using hours, minutes, and seconds or use a preset (song, podcast episode, audiobook chapter). Select the audio format and adjust quality settings like bitrate for lossy formats or sample rate and bit depth for lossless. The calculator instantly shows the file size. For podcasters, enter your episodes per month and expected listeners to estimate monthly storage and bandwidth needs.
特徴
- 5 Audio Formats – MP3, AAC, OGG Vorbis (lossy), WAV and FLAC (lossless) with format-specific settings
- Configurable Quality – Bitrate selection for lossy formats (64-320 kbps), sample rate (22.05-192 kHz), bit depth (16/24/32-bit), and mono/stereo channels for lossless
- Preset Durations – Quick-load common durations: song (3.5 min), podcast episodes (30/60/90 min), audiobook chapter (20 min)
- Podcast Hosting Estimator – Calculate monthly storage and bandwidth based on episodes per month and listener count
- Quality Comparison Table – See file sizes across all available bitrates for your chosen duration at a glance
- WAV vs Compressed – Side-by-side comparison showing how much space each format saves compared to uncompressed WAV
- Copy Results – Copy all calculated values to clipboard
よくある質問
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How is audio file size calculated?
For lossy formats like MP3 and AAC, file size equals bitrate multiplied by duration divided by 8 (to convert bits to bytes). A 128 kbps MP3 of a 60-minute podcast is approximately 128,000 bits/second times 3,600 seconds divided by 8, which equals about 57.6 MB. For uncompressed WAV, the formula is sample rate times bit depth times channels times duration divided by 8. A 44.1 kHz, 16-bit stereo WAV of the same duration would be about 635 MB.
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What bitrate should I use for a podcast?
Most podcasts use MP3 or AAC at 128 kbps for stereo or 64 kbps for mono speech. This provides clear voice quality while keeping file sizes manageable for hosting and downloads. For music-heavy podcasts, 192 kbps offers better fidelity. Going above 192 kbps for spoken word provides diminishing returns that most listeners cannot distinguish, especially on earbuds or phone speakers. Mono at 64 kbps is the sweet spot for interview and talk-show formats.
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What is the difference between WAV and FLAC?
WAV stores audio completely uncompressed, preserving every sample exactly as recorded. FLAC uses lossless compression to reduce file sizes by 50-70% without losing any audio data. When decoded, FLAC produces bit-for-bit identical output to the original WAV. The tradeoff is that FLAC requires slightly more processing power to encode and decode. For archiving and professional use, FLAC is preferred over WAV because it saves significant storage while maintaining perfect quality.
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How much bandwidth does a podcast need per month?
Monthly bandwidth depends on file size times number of downloads. A 60-minute episode at 128 kbps MP3 is about 57.6 MB. With 1,000 listeners downloading 4 weekly episodes, you need about 230 GB per month. Most podcast hosting platforms include generous bandwidth in their plans. Buzzsprout, Libsyn, and Podbean offer plans starting at 250 GB to unlimited bandwidth. If you are self-hosting, calculate total downloads times average episode size to estimate your CDN or server bandwidth requirements.
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