Z (Section Modulus) = I/y
where:
I = 2nd moment of inertia wrt the relevant bending axis
y = distance from the neutral axis to the extreme fiber of the beam (ie top or bottom of beam)
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There are some sources out there that list Z for various structural shapes. AISC Steel Construction Manual lists Z for all of the ASTM A6 shapes, but I don't know where you can find similar listings for metric shapes.
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To calculate I from the page you reference, you have several options. First, you can approximate I by calculating I for the web and two flanges about their centroids, then transforming them to the section centroid (Ic = I + Ad^2). Or, vastly easier, is to just draw the section in a 2D Cad program. It can calculate those values for you.
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