10 DAX Calculations for your Tabular or Power Pivot Model (Part 1)

If you've read my blog for a while you may have seen the following posts: Ten MDX Calculations For Your Cube (part 1) Ten MDX Calculations For Your Cube (part 2) Well the time has come for me to put together a compilation of ten useful DAX calculations for your Tabular or Power Pivot model (in no particular order so don't infer any level of ranking or importance from the order they're posted).