# Calculate MP3 Length
**URL:** https://community.mp3tag.de/t/calculate-mp3-length/10145
**Category:** Support
**Created:** [March 20, 2010, 9:51am UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145 "2010-03-20T09:51:51Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@adrianh](https://community.mp3tag.de/u/adrianh)
#### Post date: [March 20, 2010, 9:51am UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/1 "2010-03-20T09:51:51Z")
Hi
Is it possible for MP3Tag to calculate the length of selected mp3's and update the LENGTH field in the tag via an action (or a batch mode)
Reason for this question is that the XBox 360 only displays the duration of a mp3 when the LENGTH tag is present.
Regards
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### Author:  [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [March 20, 2010, 10:13am UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/2 "2010-03-20T10:13:49Z")
> [@adrianh](#):
>
> ...Is it possible for MP3Tag to calculate the length of selected mp3's and update the LENGTH field in the tag via an action (or a batch mode)
Yes, it is possible.
If you speak about duration in seconds, then you can use the **%\_length\_seconds%** system variable, which contains the length of the music part of a file in seconds.
This length is a value rounded to seconds, not an accurate value of samples or fractions of a second.
Create an action "Format value" for the tag field LENGTH and use %\_length\_seconds% as format string.
Run this action against each file you want.
DD.20100320.1213.CET
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### Author:  [@adrianh](https://community.mp3tag.de/u/adrianh)
#### Post date: [March 20, 2010, 10:29am UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/3 "2010-03-20T10:29:09Z")
Thanks for the prompt reply, this solution works great. 🕶
Note that LENGTH fields holds milliseconds so I had to multiply **%\_length\_seconds%** by 1000.
_$mul(%\_length\_seconds%,1000)_
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### Author:  [@DetlevD](https://community.mp3tag.de/u/DetlevD)
#### Post date: [March 20, 2010, 10:35am UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/4 "2010-03-20T10:35:46Z")
> [@adrianh](#):
>
> Thanks for the prompt reply, this solution works great. 🕶 Note that LENGTH fields holds milliseconds so I had to multiply **%\_length\_seconds%** by 1000.
> _$mul(%\_length\_seconds%,1000)_
Ok, well done.
See also ...
[Tag LENGTH](https://community.mp3tag.de/t/9051/4)
DD.20100320.1235.CET
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [February 2, 2023, 2:57pm UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/5 "2023-02-02T14:57:06Z")
2 posts were split to a new topic: [Display LENGTH in column](https://community.mp3tag.de/t/display-length-in-column/59930)
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [February 2, 2023, 3:28pm UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/6 "2023-02-02T15:28:05Z")
A post was merged into an existing topic: [Display LENGTH in column](https://community.mp3tag.de/t/display-length-in-column/59930/4)
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [February 2, 2023, 3:31pm UTC](https://community.mp3tag.de/t/calculate-mp3-length/10145/7 "2023-02-02T15:31:24Z")