For anyone in need of a quick handy tool for measuring how many Steps it takes to move one Millimeter; Just enter the two values and hit submit, note if the entered amount is 0 (Zero) you will get a non critical PHP error so enter values in both fields.
You will need to know how many Threads Per Inch your Bar Stock is, for example 1/4" Bar is 20-TPI
You will also need to enter the Stepper-Motors Step Angle, eg .9 or 1.8

steps per inch mach3 wizard Conversion tool just enter TPI and Step angle to get steps per MM

Hope it helps!