Is it possible to use simple Math in an SLD file on Geoserver? Suppose I want to read a text size property from a database and multiply its value, how can I do this?

    <sld:CssParameter name="font-size">
        <ogc:PropertyName>text_size</ogc:PropertyName> * 2.1

This simple approach obviously doesn't work, so I thought there must be some way to achieve this.

1 Answer 1


You can use the math functions ogc:Mul ogc:Div ogc:Add & ogc:Sub to do simple maths on properties.

So your example would become:

<sld:CssParameter name="font-size">

The only issue is that technically the SLD specification may not allow you to use a function in a CssParameter. However GeoServer is much more forgiving and will allow it.

If you ever need more complex functions see the reference page.

  • works like a charm Commented Jan 21, 2015 at 8:46
  • I found that <ogc:Mult> did not work for me, but <ogc:Mul> did. Commented Jun 8, 2016 at 1:33

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