Transcription: milligrams per meter squared, or mg by m squared. A formula for calculating dosages of chemotherapy drugs according to the surface area of the body. Since the amount of skin is hard to determine exactly, it is closely estimated from height and weight. An average person might have 1.7 square meters of body surface area. If the standard drug dosage were 650 milligrams per meter squared, then 650 times 1.7 equals 1105 milligrams of drug to be given.