Audio File Size Calculator
Estimate audio file size for MP3, AAC, Opus, WAV, and FLAC using duration, bitrate, sample rate, bit depth, and channels. Use it as an MP3 file size calculator, WAV file size calculator, or bitrate-based audio size calculator before you convert.
- Useful for upload limits, email attachments, and storage planning
- Switch between compressed and lossless estimates
- Runs instantly in the browser with no file upload needed
Estimate your output size
Use this calculator before converting audio so you can choose a bitrate or lossless format that fits your upload, storage, or sharing target.
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How audio file size is calculated
- Compressed audio: size is driven mostly by bitrate and duration. A 128 kbps file uses roughly twice the space of a 64 kbps file at the same duration.
- WAV / PCM: size depends on sample rate, bit depth, channels, and duration.
- FLAC: start from WAV size, then estimate the compression ratio. Speech usually compresses more than dense music.
Audio file size per minute: common MP3 bitrates
If you mainly need an MP3 file size calculator, bitrate is the biggest variable. These rough numbers use the same formula as the calculator above: size = duration x bitrate / 8.
| Bitrate | Approx. per minute | Approx. per hour | Common use |
|---|---|---|---|
| 64 kbps | 0.48 MB | 28.8 MB | Small voice files |
| 96 kbps | 0.72 MB | 43.2 MB | Meetings and podcasts |
| 128 kbps | 0.96 MB | 57.6 MB | General sharing |
| 192 kbps | 1.44 MB | 86.4 MB | Music playback |
WAV file size calculator: quick examples
A WAV file size calculator needs sample rate, bit depth, channel count, and duration. Uncompressed audio grows quickly, so these examples are useful when planning storage or checking whether a WAV master is realistic for upload.
| WAV setting | Approx. per minute | Approx. per hour |
|---|---|---|
| 44.1 kHz, 16-bit, mono | 5.29 MB | 317.5 MB |
| 44.1 kHz, 16-bit, stereo | 10.58 MB | 635.0 MB |
| 48 kHz, 24-bit, mono | 8.64 MB | 518.4 MB |
| 48 kHz, 24-bit, stereo | 17.28 MB | 1036.8 MB |
Quick reference by common targets
| Use case | Suggested format | Typical target |
|---|---|---|
| Voice notes and meetings | MP3 or AAC | 64-96 kbps mono |
| Podcast uploads | MP3 | 96-128 kbps mono or stereo |
| Music sharing | MP3 or AAC | 192 kbps stereo |
| Editing masters | WAV | 44.1 kHz, 16-bit, stereo or higher |
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Related guides
Estimate the target size here, then use the converter to export an MP3, AAC, WAV, or FLAC version that fits your workflow.