Calculate percentage of total columns based on total column in SSRS Matrix?

Probably this is happening because you need define the right scope for the SUM function.

Probably this is happening because you need define the right scope for the SUM function: SUM(Fields!ID. Value,"group_name") instead of plain SUM(Fields!ID. Value) Updated: I needed some time to make an example since I didn't have reporting services available the first time I answered you.

You can see the result and the field values.

This seems like it should be the correct sollution; however, when you add a totals column, it does not get assigned a group name. This makes it not callable. – Tom Sep 26 at 17:24.

Hard to provide details without more info on the setup of your groups, but you should look at using the scope option to the aggregate operators like SUM or first: =SUM(Fields!ID. Value, "NameOfRowGrouping") / SUM(Fields!ID. Value, "TopLevelGroupName") Also, to keep things clean, you should move your format out of the expression and to either the placeholder properties or textbox properties that contains your value.

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