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Technology

Audio File Size Calculator

File size from bitrate and duration.

Enter your values

Enter the duration in min.

Choose one of: 64 kbps voice, 128 kbps standard, 192 kbps high, 320 kbps max.

Enter the channels you are working with.

Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.

Results
File size
42.2 MB
Per minute
0.94 MB
Hours per GB
18.2
Bitrate used
128 kbps

Quick answer

Audio file size is bitrate multiplied by duration, converted to bytes.

MB = bitrate (kbps) × seconds ÷ 8192

At a glance

What it doesFile size from bitrate and duration.
CategoryTechnology
Inputs neededDuration, Bitrate, Channels
Main outputFile size
FormulaMB = bitrate (kbps) × seconds ÷ 8192
CostFree — no sign-up, no download

How to use the Audio File Size Calculator

  1. 1Enter the recording length.
  2. 2Choose the export bitrate.
  3. 3Read the resulting file size.

Inputs explained

Duration(min)
Enter the duration in min.
Bitrate
Choose one of: 64 kbps voice, 128 kbps standard, 192 kbps high, 320 kbps max.
Channels
Enter the channels you are working with.

Worked example

Using the values the calculator loads with:

Inputs

  • Duration45 min
  • Bitrate128 kbps standard
  • Channels2

Results

  • File size42.2 MB
  • Per minute0.94 MB
  • Hours per GB18.2
  • Bitrate used128 kbps

Frequently asked questions

What bitrate for podcasts?

96–128 kbps mono is plenty for spoken word.

Is 320 kbps worth it?

Only for music; most listeners cannot hear the difference above 192.

What do I need to enter into the Audio File Size Calculator?

Just 3 values: duration, bitrate, channels. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.

How does the Audio File Size Calculator work out the answer?

Audio file size is bitrate multiplied by duration, converted to bytes. It applies the formula MB = bitrate (kbps) × seconds ÷ 8192 and shows the working so you can check each step by hand.

Is the Audio File Size Calculator free, and do I need an account?

It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.

Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.