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Audio file size calculator

Estimate an uncompressed audio file's size from its length, sample rate and bit depth.

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The Audio file size calculator turns Duration (minutes), Sample rate (kHz), Bit depth, Channels into File size (MB), instantly and for free. For instance, with Duration (minutes) = 3, Sample rate (kHz) = 44.1, Bit depth = 16 and Channels = 2 it returns File size (MB) = 31.752.

How to use it

  1. Enter your values: Duration (minutes), Sample rate (kHz), Bit depth, Channels.
  2. Read the result instantly: File size (MB).

Frequently asked questions

How does the Audio file size calculator work?

It takes Duration (minutes), Sample rate (kHz), Bit depth and Channels and derives File size (MB) from them. The calculation is live as you type, so the result updates on every change.

Which values does the calculator ask for?

4 values: Duration (minutes), Sample rate (kHz), Bit depth and Channels. Nothing else is required — no account, no file upload.

What does a typical calculation look like?

With Duration (minutes) = 3, Sample rate (kHz) = 44.1, Bit depth = 16 and Channels = 2, the calculator returns File size (MB) = 31.752. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

How much does the result change with different inputs?

It moves a lot. Using Duration (minutes) = 6, Sample rate (kHz) = 48.5, Bit depth = 32 and Channels = 4 instead, File size (MB) goes from 31.752 to 279.36 — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Duration (minutes) = 1.5, Sample rate (kHz) = 39.7, Bit depth = 8 and Channels = 1, File size (MB) comes out at 3.573. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Finding out how big a thing will be before you make it: how many gigabytes an hour of footage takes, how long a file needs on the connection you have, how large a photo prints before it goes soft, what bitrate fits the budget you were given.

What is the most common mistake?

Taking the advertised connection speed as the transfer speed. A 100 Mb/s line is megabits, the file is in megabytes, and the eight-fold difference between them is where most download estimates go wrong — before overhead and contention take their own share.

What is the difference between the Audio file size calculator and the Video file size calculator?

Both return File size (MB). What differs is what they ask for: this one wants Sample rate (kHz) and Bit depth, the Video file size calculator wants Bitrate (Mbps). Use whichever matches the numbers you already have.

Is there a tool for the next step?

Photo File Size Estimator is the closest one after this: Estimate the pixel dimensions and JPEG, RAW and TIFF file sizes from megapixels, aspect and bit depth.

What else is worth having open alongside it?

Paper Size Reference (A4, Letter, ISO 216) and Print size calculator — they come up in the same task often enough to be worth a second tab.

Further reading

All guides →
ExplainerHow Big Is That Audio File?Uncompressed audio size is exact arithmetic: sample rate × bit depth × channels × seconds ÷ 8. CD audio is 176,400 bytes per second. A 320 kbps MP3, by contrast, is bitrate × duration and does not depend on the sample rate at all — 2,400,000 bytes a minute whether it came from 44.1 or 48 kHz.ExplainerFrame Rates, Timecode, and the Drop-Frame That Drops NothingFrames = duration × rate is trivial until the rate is 29.97. Non-drop timecode then drifts exactly 3.6 seconds an hour. Drop-frame corrects it by skipping 108 frame numbers — the same 108 — but the correction is not perfect: counting every frame shows a residual of 3.6 milliseconds per hour.How-toHow to Estimate Video File Size (Bitrate x Duration)Estimate any video's file size before you export. Learn the bitrate-times-duration formula, why you divide by 8, and how resolution and frame rate change the result.ExplainerScreen Resolution, Pixel Density, and the Numbers Marketing UsesA diagonal plus an aspect ratio gives you width and height by Pythagoras, and the answer is not what the marketing implies: a 27-inch 21:9 has 16.2% less area than a 27-inch 16:9. Then pixels per degree, which shows the highest-PPI phone is not the sharpest thing you own.ExplainerWhat Is Bitrate? Bits per Second, CBR vs VBRBitrate is how many bits of data a video or audio stream uses each second. Learn how it sets quality and file size, and the difference between constant and variable bitrate.ExplainerHow Much Data Streaming Uses: SD, HD, and 4K per HourSee how many gigabytes per hour SD, HD, and 4K video use, and how to check a monthly streaming habit against a data cap.