# Audio File Size Calculator

URL: https://speedycalculator.com/calculators/other/audio-file-size/
Last updated: 2026-10-25

> The audio file size calculator estimates storage for uncompressed audio (WAV/AIFF) from sample rate, bit depth, channels and duration, and for compressed audio from bitrate.

## Inputs

- Sample rate
- Bit depth
- Channels
- Duration (min, s, h)
- Compressed bitrate (kbps)

## Results

- Uncompressed size
- Compressed size
- Uncompressed bitrate

## Formula

```
Uncompressed bytes = sample rate × bit depth × channels × seconds ÷ 8
```

## Explanation

CD audio (44.1 kHz, 16-bit, stereo) uses about 10 MB per minute; a 320 kbps MP3 uses about 2.4 MB per minute.

### How to use the Audio File Size Calculator

- **Sample rate**
- **Bit depth**
- **Channels**
- **Duration**
- **Compressed bitrate**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Multiply sampling parameters by duration for uncompressed audio; multiply bitrate by duration for compressed formats.

### Inputs explained

FieldWhat to enterSample rateChoose one: 44.1 kHz (CD), 48 kHz (video), 96 kHz, 192 kHzBit depthChoose one: 16-bit, 24-bit, 32-bit floatChannelsA numberDurationUnits: min, s, hCompressed bitrateIn kbps

### What each result means

- **Uncompressed size** = [Sample rate]×[Bit depth]×[Channels]×[Duration]÷8
- **Compressed size** = [Compressed bitrate]×1000×[Duration]÷8
- **Uncompressed bitrate** = [Sample rate]×[Bit depth]×[Channels]÷1000

### Example values

How the main result changes when **Channels** changes and everything else stays at the example values above:

ChannelsUncompressed size (MB)121.171.531.75242.342.552.92363.5484.67

## Worked example

Inputs — Sample rate: 44.1 kHz (CD); Bit depth: 16-bit; Channels: 2; Duration: 4 min; Compressed bitrate: 320 kbps.

Results — **Uncompressed size = 42.34 MB**; Compressed size = 9.6 MB; Uncompressed bitrate = 1,411 kbps.

## FAQ

**Is FLAC smaller than WAV?**
Yes, lossless compression typically halves the size.

**What bitrate is transparent for MP3?**
Most listeners cannot tell 256–320 kbps from the original.

**What formula does the Audio File Size Calculator use?**
Uncompressed bytes = sample rate × bit depth × channels × seconds ÷ 8.