Audio File Size Calculator
Estimate audio file size from bitrate, sample rate, channels, and duration for WAV, MP3, and other formats, free online.
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How to use this calculator
- Enter the sample rate in kHz (e.g. 44.1), the bit depth, and the number of channels.
- Enter the duration in minutes.
- Read the file size, bitrate and size per minute.
How it works
The Audio File Size Calculator works out how big an uncompressed PCM/WAV recording will be from its format settings.
Size = sample rate × bit depth × channels × time ÷ 8 (the ÷8 converts bits to bytes). The bitrate is sample rate × bit depth × channels. CD audio (44.1 kHz, 16-bit, stereo) is about 1,411 kbps, or roughly 10 MB per minute.
Worked example
CD-quality, 3 minutes. 44.1 kHz × 16-bit × 2 channels = 1,411 kbps, so a 3-minute track is about 30.3 MB as WAV.
Frequently asked questions
Why are my MP3s so much smaller?
This figure is for uncompressed PCM/WAV. MP3, AAC and similar formats use lossy compression, typically 5–11× smaller, by discarding data the ear is unlikely to notice.
What's the difference between bit depth and bitrate?
Bit depth is the resolution of each sample (e.g. 16-bit); bitrate is the total data per second — sample rate × bit depth × channels.
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Cite this tool
Zerdly. (2026). Audio File Size Calculator. Retrieved from https://www.zerdly.com/tools/audio-file-size-calculator/
Tip: Enter any known values to calculate the remaining results.
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