Result

Estimated file size

5.15 MB

Bitrate

192 kbps

Per minute

1.37 MB

Per hour

82.40 MB

How it was calculated

192 kbps × 1000 = 192,000 bits per second
× 225 s = 43,200,000 bits
÷ 8 = 5,400,000 bytes

Sizes use 1,024-based units (1 MB = 1,048,576 bytes), the way most computers show them. Container overhead and cover art add a little extra.

Typical sizes for this length

Format	Bitrate	Size
Voice memo / podcast (mono MP3)	64 kbps	1.72 MB
MP3 standard	128 kbps	3.43 MB
MP3 high	192 kbps	5.15 MB
MP3 best (320)	320 kbps	8.58 MB
AAC / Apple Music	256 kbps	6.87 MB
Opus (very good)	128 kbps	3.43 MB
FLAC (typical, CD source)	900 kbps	24.14 MB
WAV / CD (16-bit, 44.1 kHz stereo)	1411.2 kbps	37.85 MB
WAV 24-bit, 48 kHz stereo	2304 kbps	61.80 MB

How to use the Audio Bitrate & File Size Calculator

Choose what to work out: file size, bitrate or duration.
Enter the bitrate (or WAV settings), duration and/or size.
Read the result and compare typical formats in the table.

What does this tool do?

Bitrate is the amount of data per second of audio. Multiply it by the duration and divide by 8 to get bytes. MP3 at 128 kbps uses about 1 MB per minute; CD-quality WAV uses about 10 MB per minute.

Useful for podcast hosting limits, email attachment sizes, storage planning and checking whether a file is really the quality it claims.

Why use it?

Three directions.
PCM/WAV mode.
Format comparison table.

The formula

Size (bytes) = bitrate (kbps) × 1000 × seconds ÷ 8

PCM bitrate = sample rate × bit depth × channels

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Last reviewed October 4, 2026 by the M2Toolkit team.