Maggie Ruggiero, a food editor with Gourmet Magazine, and Test Kitchen demonstrate how to correctly measure flour. To properly measure flour, first spoon the flour into a measuring cup. Then level the flour in the measuring cup by taking a knife and sliding it across the top of the measuring cup. Never pack the flour into the measuring cup. If you pack the flour into the measuring cup, you will get a significant difference and increase of about three tablespoons of the flour in the measuring cup which increases with each cup of flour used. Remember when measuring flour not to pack the flour in the measuring cup but simply level it off with a knife.