Why enter file size and duration instead of just uploading the file?

Bitrate is pure arithmetic (size ÷ time) — no need to decode the audio itself, so entering the two numbers is faster and works even for formats the browser can't play.

Is this the same as the exact bitrate a converter used?

It's the average bitrate implied by the final file size and duration — variable-bitrate (VBR) encoders fluctuate throughout the file, so this is an average, not a frame-by-frame reading.

Does this tool upload my file anywhere?

No file is needed at all — just the two numbers, calculated entirely in your browser.

Audio Bitrate Calculator

Calculate an audio file’s bitrate from its file size and duration.

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File size (MB)

Duration — minutes

Duration — seconds

190 kbps

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How it works

1
Enter the file size and duration

In MB and minutes/seconds — no need to upload the file.
2
Bitrate calculated instantly

File size ÷ duration, in kbps.
3
Compare against common bitrates

e.g. 128/192/320 kbps for MP3.

FAQ

Why enter file size and duration instead of just uploading the file?: Bitrate is pure arithmetic (size ÷ time) — no need to decode the audio itself, so entering the two numbers is faster and works even for formats the browser can't play.
Is this the same as the exact bitrate a converter used?: It's the average bitrate implied by the final file size and duration — variable-bitrate (VBR) encoders fluctuate throughout the file, so this is an average, not a frame-by-frame reading.
Does this tool upload my file anywhere?: No file is needed at all — just the two numbers, calculated entirely in your browser.