Audio Bitrate Calculator

Calculate average audio bitrate from file size and playback duration

Your result will appear here.

About the Audio Bitrate Calculator

Audio Bitrate Calculator works with audio data rate, file size and duration. It is useful for podcasts, music, voice recordings and streaming where the goal is to balance sound quality with storage or bandwidth.

Compressed bitrate and uncompressed PCM data rate are different concepts. MP3 or AAC uses a compressed target bitrate, while PCM depends directly on sample rate, bit depth and channel count.

How to Use the Audio Bitrate Calculator

  1. Choose compressed or PCM mode.
  2. Enter duration and either target file size or codec bitrate.
  3. For PCM, enter sample rate, bit depth and channels.
  4. Calculate bitrate or size and compare the result with the delivery format’s practical limits.

How the Calculation Works

For compressed audio, bitrate = file size in bits ÷ duration in seconds.

For PCM, raw bitrate = sample rate × bit depth × number of channels. A 48 kHz, 24-bit stereo signal therefore has 48,000×24×2 = 2,304,000 bits/s before container overhead.

Worked example

Audio Bitrate Calculator Worked Example

60 MB file lasting 40 minutes

60 MB decimal = 480 megabits. Duration = 2,400 seconds. Average bitrate = 480÷2,400 = 0.2 Mbps, or 200 kbps.

Result guide

Understanding Your Audio Bitrate Calculator Result

A 200 kbps average can be suitable for many compressed audio uses, but perceived quality depends on codec, content and encoder settings.

Before you rely on the answer

Assumptions and Limitations

  • Duration and file size describe the same audio stream.
  • Bit and byte units are converted correctly.
  • Container metadata and variable-bitrate behavior are treated as small or estimated effects.

Practical tip

Using This Result in Practice

For speech, do not assume a music-oriented bitrate is necessary. Test representative audio at several settings and choose the lowest rate that preserves the quality you need.

Related calculations

Useful Calculations to Continue With

If bitrate and duration are already known and you want storage size, use the Audio File Size Calculator.

If a stream bitrate must be converted between kbps, Mbps or byte-based rates, use the Data Transfer Rate Converter.

Common questions

Audio Bitrate Calculator FAQ

How is compressed audio bitrate calculated?

Divide total file bits by duration in seconds.

How is PCM bitrate calculated?

Sample rate multiplied by bit depth and channel count.

Why can two files at the same bitrate sound different?

Codec efficiency, source material and encoder implementation affect quality.