Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Audio File Size Calculator (Bitrate and Duration)
MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)
Uncompressed-ish math: size in bytes = bitrate (bits/s) × seconds ÷ 8. A 320 kbps MP3, 4 minutes, is about 9.6 MB. CD audio 1,411 kbps is 10.6 MB per minute. Variable bitrate files will miss this — it is an average-rate sketch.
The encode
About how big the file is
9.6 MB
VBR files wander. This assumes a steady bitrate, stereo already baked into the number you typed.
- Per minute
- 2.4 MB
- Bits per second
- 320,000
- Seconds
- 240
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Bitrate (kbps)
The “Bitrate (kbps)” value used in this tool’s formula. Adjust it to see results update live.
Duration (minutes)
The “Duration (minutes)” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
Uncompressed-ish math: size in bytes = bitrate (bits/s) × seconds ÷ 8. A 320 kbps MP3, 4 minutes, is about 9.6 MB. CD audio 1,411 kbps is 10.6 MB per minute. Variable bitrate files will miss this — it is an average-rate sketch. MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.) Example: 320 kbps × 4 min → 9.6 MB. 128 kbps × 3.5 min → 3.36 MB. WAV 1411 kbps × 3 min → 31.7 MB.
MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)
Example: 320 kbps × 4 min → 9.6 MB. 128 kbps × 3.5 min → 3.36 MB. WAV 1411 kbps × 3 min → 31.7 MB.
When to use this Audio Bitrate Storage
Common use cases
- Uncompressed-ish math: size in bytes = bitrate (bits/s) × seconds ÷ 8. A 320 kbps MP3, 4 minutes, is about 9.6 MB. CD audio 1,411 kbps is 10.6 MB per minute. Variable bitrate files will miss this — it is an average-rate sketch.
- Sanity-check with this case: 320 kbps × 4 min → 9.6 MB. 128 kbps × 3.5 min → 3.36 MB. WAV 1411 kbps × 3 min → 31.7 MB.
- The relationship is: MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Bitrate (kbps), Duration (minutes)
- MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)
- Example on the page: 320 kbps × 4 min → 9.6 MB. 128 kbps × 3.5 min → 3.36 MB. WAV 1411 kbps × 3 min → 31.7 MB.
How to Convert Audio Bitrate Storage Step-by-Step
- 1Enter Bitrate (kbps), Duration (minutes). Use the values you have, not a catalog average, unless that is all you know.
- 2MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)
- 3Worked case: 320 kbps × 4 min → 9.6 MB. 128 kbps × 3.5 min → 3.36 MB. WAV 1411 kbps × 3 min → 31.7 MB.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)
320 kbps × 4 min → 9.6 MB. 128 kbps × 3.5 min → 3.36 MB. WAV 1411 kbps × 3 min → 31.7 MB.
Example: set Bitrate (kbps) = 320, Duration (minutes) = 4, then read the result.
Variable definitions
- bitrateKbps
Bitrate (kbps)
The “Bitrate (kbps)” field. Default 320; typical range 8–9216.
- minutes
Duration (minutes)
The “Duration (minutes)” field. Default 4; typical range 0.1–600.
- The conversion (MB = bitrate_kbps × minutes × 60 / 8 / 1,000. (kbps × seconds / 8 / 1e6.)) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Bitrate already includes channels for most encoded files. For raw PCM, multiply sample rate × bits × channels yourself.
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Community
Reviews & Ratings
See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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Suggestion Box
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