Audio File Size Calculator

Frequently Asked Questions

Why is uncompressed audio so big?

Uncompressed PCM stores every sample at full precision with no redundancy removal. Lossy codecs discard inaudible detail to shrink size 5-10 times.

Does higher sample rate always improve quality?

Beyond 48 kHz the audible benefit is debated, but the file grows linearly - 96 kHz doubles the size of 48 kHz for little perceptual gain in most material.

What about lossless compression like FLAC or ALAC?

Lossless compression typically lands around 50-60% of the PCM size with no quality loss. Treat the PCM figure as the upper bound and a lossy bitrate estimate as the lower bound.

Why does bit depth matter for file size?

Each extra bit of depth adds one byte per 8 samples. Going from 16-bit to 24-bit increases file size by 50% per sample, while adding 8 dB of dynamic range headroom.

Why are there two ways to measure megabytes?

Decimal MB (1,000,000 bytes) is used by most hosting platforms, while binary MiB (1,048,576 bytes) is used by operating systems. This calculator uses decimal to match common upload limits.

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Estimates for informational purposes only.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.

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How It Works

This calculator estimates how large an audio file will be before you render or upload it - essential for planning storage, choosing a delivery format, and meeting the upload limits of podcast hosts or sample libraries. It works two ways. In PCM (uncompressed) mode it uses the sample rate, bit depth, channel count, and duration to compute the exact size of a WAV or AIFF file. In compressed mode it uses a target bitrate (as MP3, AAC, or Opus encoders do) and duration to estimate the resulting file size.

It also reports the data rate per minute and the equivalent bitrate, so you can compare a CD-quality WAV against a streaming-grade MP3 at a glance. Knowing the figure in advance prevents the familiar surprise of a session render blowing past a host's upload cap, or a sample pack ballooning to several gigabytes because every loop was kept at 24-bit/96 kHz when 16-bit/44.1 would have been indistinguishable to the listener.

An uncompressed PCM stream stores one fixed-size sample per channel per tick. Its data rate is sample-rate x (bit-depth / 8) x channels bytes per second. For lossy formats the encoder targets a fixed bitrate R kbps, so size is simply R x 1000 / 8 x seconds bytes.

Use Cases

Audio file size estimation is useful across many workflows:

Checking whether a master WAV will fit within a podcast host's upload limit before exporting

Planning storage for a multi-track recording session at high resolution

Comparing WAV vs. MP3 file sizes before sending to a client

Estimating download bandwidth for a sample library or loop pack

Deciding between 16-bit and 24-bit delivery for a music service submission

Tips

Send 24-bit/48 kHz WAV for mastering, 16-bit/44.1 kHz WAV for CD, and 256-320 kbps AAC/MP3 for general distribution.

Stereo files are exactly twice the size of mono at the same settings - do not forget to multiply by channel count.

Beyond 48 kHz the audible benefit is debated, but the file grows linearly: 96 kHz doubles the size of 48 kHz.

FLAC lossless compression typically lands around 50-60% of the PCM size with no quality loss.

File-size figures here use decimal units (1 MB = 1,000,000 bytes) to match how most hosts and stores quote limits.

FAQ

Why is uncompressed so big?

It stores every sample at full precision with no redundancy removal. Lossy codecs discard inaudible detail to shrink size 5-10 times.

Does higher sample rate always help?

Beyond 48 kHz the audible benefit is debated, but the file grows linearly - 96 kHz doubles the size of 48 kHz for little perceptual gain in most material.

What about lossless compression like FLAC or ALAC?

It typically lands around 50-60% of the PCM size with no quality loss. Treat the PCM figure as the upper bound and a lossy bitrate estimate as the lower bound.

Why does bit depth matter?

Each extra bit of depth doubles the number of amplitude levels, adding 6 dB of dynamic range. Going from 16-bit to 24-bit increases file size by 50% per sample.

Why are there two ways to measure megabytes?

Decimal MB (1,000,000 bytes) is used by most hosting platforms and stores, while binary MiB (1,048,576 bytes) is used by operating systems. This calculator uses decimal to match common upload limits.

Audio File Size Calculator

Frequently Asked Questions

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