# $num(x,y) should not truncate decimal numbers to the whole part
**URL:** https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643
**Category:** Fixed Bugs
**Tags:** bug-fixed
**Created:** [September 7, 2025, 7:56pm UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643 "2025-09-07T19:56:29Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@e345](https://community.mp3tag.de/u/e345)
#### Post date: [September 7, 2025, 7:56pm UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/1 "2025-09-07T19:56:29Z")
reopening old issue: [[X] $num doesn’t work as described](https://community.mp3tag.de/t/x-num-doesnt-work-as-described/11257)
OS: Windows 10
mp3tag: 3.31a
According to Docs ( [Scripting Functions – Mp3tag Documentation](https://docs.mp3tag.de/scripting/) ),
"returns string x interpreted as decimal number, padded with leading zeros from the left up to y digits. It ignores anything from the first non-numeric character, or results in 0 if the string is not numeric."
$num(x,y) should handle decimal numbers, but instead, it truncates the number to the whole value.
Expected: $num(1.5,2) = 01\*\*.5\*\*
Actual: $num(1.5,2) = 01
My Action: $num(%series-part%,2)
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [September 7, 2025, 8:04pm UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/2 "2025-09-07T20:04:11Z")
Perhaps "decimal number" is an unlucky term as MP3tag only handles integer numbers.
(This is also mentioned in the documentation:
## [Arithmetic Functions](https://docs.mp3tag.de/scripting/#arithmetic-functions)
Integer arithmetic only, operations support up to 64 arguments.
```auto
```
In that context $num() works as described: it ignores anything from the first non-numeric character onwards which is the dot in your your example. That leaves only the "1" which is then padded to show 2 digits.
---
### Author:  [@e345](https://community.mp3tag.de/u/e345)
#### Post date: [September 7, 2025, 8:17pm UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/3 "2025-09-07T20:17:40Z")
> [@ohrenkino](#):
>
> s is also mentioned in the d
Agreed. While I would (obviously) like decimals to be handled, If this is not going to make the priority list, I would suggest changing the docs: "decimal" -\> "integer", to avoid confusion.
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [September 8, 2025, 6:18am UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/4 "2025-09-08T06:18:16Z")
> [@e345](#):
>
> Expected: $num(1.5,2) = 01\*\*.5\*\*
>
> Actual: $num(1.5,2) = 01
>
> My Action: $num(%series-part%,2)
An emulation would be:
`$num($div($replace(1.5,.,),10),2).$mod($replace(1.5,.,),10)`
---
### Author:  [@e345](https://community.mp3tag.de/u/e345)
#### Post date: [September 8, 2025, 10:22pm UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/5 "2025-09-08T22:22:53Z")
Thanks @ohrenkino . I updated your suggestion to also handle whole numbers:
`$ifgreater($strchr(%series-part%,.),0,$num($div($replace(%series-part%,.,),10),2).$mod($replace(%series-part%,.,),10),$num(%series-part%,2))`
---
### Author:  [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [September 9, 2025, 9:16am UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/6 "2025-09-09T09:16:13Z")
> [@e345](#):
>
> $num(x,y) should handle decimal numbers, but instead, it truncates the number to the whole value.
> [@ohrenkino](#):
>
> Perhaps "decimal number" is an unlucky term as MP3tag only handles integer numbers.
Thanks for pointing, I've updated the documentation accordingly.
---
### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [October 9, 2025, 9:16am UTC](https://community.mp3tag.de/t/num-x-y-should-not-truncate-decimal-numbers-to-the-whole-part/69643/7 "2025-10-09T09:16:39Z")
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