Calculating volume of a group or component

anybody know of a way to calc the volume of a concrete wall or might suggest a plug in that might calculate the volume of a group or component

Is the wall a single solid group? Select it and look at the Entity Info window.

Another useful option is Volume Calculator 2: SketchUp Plugins | PluginStore | SketchUcation

I downloaded Volume Calculator 2, can see it in the Extension Manager window, but it does not automatically appear under the Extension tab in SketchUp. I have restarted SketchUp but get same result. I am running the free version of SketchUp 2017. Any suggestions?

Right click on the component or group. Select Volume from the context menu.