MP3 Size Calculator
Enter the track length in minutes and seconds, the bitrate and how many tracks. The calculator gives the MP3 file size, the size per minute and how much smaller it is than a WAV.
- MP3 size
- Per minute
- Against WAV
1 MB here is 1,000,000 bytes, as used by most apps and upload limits.
MP3 size is bitrate times time. A 4 minute track at 320 kbps is 320,000 bits a second for 240 seconds, 9.6 MB. At 128 kbps the same track is 3.84 MB, against 42 MB as a CD quality WAV.
MP3 size chart
Per track length. Search for a bitrate.
| Bitrate (kbps) | 1 minute (MB) | 4 minutes (MB) | 1 hour (MB) |
|---|---|---|---|
| 64 | 0.48 | 1.9 | 29 |
| 96 | 0.72 | 2.9 | 43 |
| 128 | 0.96 | 3.8 | 58 |
| 160 | 1.2 | 4.8 | 72 |
| 192 | 1.44 | 5.8 | 86 |
| 256 | 1.92 | 7.7 | 115 |
| 320 | 2.4 | 9.6 | 144 |
MB.
Track length and size
All bitrates. Slide the track length.
Each bar is one bitrate.
How to work out MP3 size
Bitrate to MB. Step through it.
Length
In seconds.
Variable bitrate files land close to their average rate.
128, 192 or 320 kbps
Bitrates. Compare them.
Small.
Balanced.
Top MP3.
Most people cannot hear a difference above 192 kbps on phone earbuds.
Before you export
Export checks. Tick each item.
Tick each item as you go.
Keep a lossless master and export MP3s from that.
What you get
File sizing. Each tile explains one result.
MB.
MB.
Compared.
Tracks per GB.
Per cent.
Cover art in an MP3 tag can add a few hundred KB.
Frequently Asked Questions
No question matches that search.
How big is a typical song file?
About one megabyte a minute at one hundred and twenty eight kbps, and two point four at three hundred and twenty.
How do I work out the file size of a song?
Multiply the bitrate by the length in seconds and divide by eight.
How many songs fit in a gigabyte?
About two hundred and fifty four minute songs at one hundred and twenty eight kbps.
Is a compressed song smaller than a WAV?
Yes, about four to eleven times smaller.
Does stereo change the file size?
No. The bitrate already covers both channels.
What bitrate should I use?
One hundred and ninety two kbps or more for music, lower for speech.
Why is my file a little bigger?
Tags and cover art are added on top of the audio.
Know the size before you save
Pick a bitrate and length and see exactly how much space your MP3s will take.
More size calculators
Each one has its own calculator, worked examples and answers to common questions.