Magnification+and+Actual+Size

1) Measure the scale bar in mm 2) Convert the measurement to the same units as the scale bar 3) Divide this number by the number on the scale bar
 * To calculate magnification:**

1) Measure the dimention of what you want to know the actual size of 2) divide this by the magnification 3) Convert this number to a suitable unit
 * To calculate actual size:**