Audio File Size Calculator

Enter the values in our basic and advanced Audio File Size Calculator for instant and easy calculations

An Audio File Size Calculator helps you figure out the size of audio files based on format, bitrate, and duration. By inputting these values, you can easily calculate how much space an audio file will occupy in MB or GB.

Formula:

The formula is:

$\text{FS} = \frac{\text{BR} \times \text{D}}{8}$

Variables

Variable	Meaning
FS	File Size (the total size of the audio file, usually in bytes or kilobytes)
BR	Bitrate (the amount of data processed per second, typically in kbps)
D	Duration (the length of the audio file in seconds)
8	Conversion factor (to convert bits to bytes)

How to Calculate ?

To calculate the audio file size (FS), first, determine the bitrate (BR) of the audio file, which is typically given in kilobits per second (kbps). Next, measure the duration (D) of the audio file in seconds. Multiply the bitrate by the duration to get the total number of bits. Finally, divide the result by 8 to convert bits into bytes, which gives the file size.

Solved Calculations :

Example 1:

Given:

Bitrate (BR) = 128 kbps
Duration (D) = 300 seconds

Calculation	Instructions
Step 1: FS = $\frac{\text{BR} \times \text{D}}{8}$	Start with the formula.
Step 2: FS = $\frac{128 \times 300}{8}$	Replace BR with 128 kbps and D with 300 seconds.
Step 3: FS = $\frac{38400}{8}$	Multiply 128 by 300 to get 38,400 bits.
Step 4: FS = 4800 KB	Divide by 8 to get the file size in kilobytes.

Answer:
The audio file size is 4800 KB.

Example 2:

Given:

Bitrate (BR) = 256 kbps
Duration (D) = 180 seconds

Calculation	Instructions
Step 1: FS = $\frac{\text{BR} \times \text{D}}{8}$	Start with the formula.
Step 2: FS = $\frac{256 \times 180}{8}$	Replace BR with 256 kbps and D with 180 seconds.
Step 3: FS = $\frac{46080}{8}$	Multiply 256 by 180 to get 46,080 bits.
Step 4: FS = 5760 KB	Divide by 8 to get the file size in kilobytes.

Answer:
The audio file size is 5760 KB.

What is Audio File Size Calculator :

An Audio File Size Calculator helps know the size of an audio file based on various parameters like format, bitrate, and duration.

For instance, a 1-hour MP3 file at 128 kbps would be approximately 57.6 MB. This tool is useful for knowing storage needs for audio files, especially when managing music libraries, podcasts, or any type of audio recordings.

Whether you’re dealing with MP3s, WAVs, or other formats, this calculator can give you accurate file size estimates. For example, MP3 files are generally smaller than uncompressed WAV files due to compression. Knowing how much space an audio file will take can be helpful when uploading files, planning storage, or organizing digital music libraries.

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