I am trying to use the beam bending calculator and keep coming up with NaN n the results. What does it mean? Also the number I enter in the moment of inertia column is .0136 (from Solid Works mass properties) and the calculator rounds it off to 0.000, any Suggestions? I am trying to calculate how much bow I could expect by adding ribs to a plastic injection molded part. Thanks. in advance for your help.