Hi everyone, It is not to long ago I took chemistry, biology and completed a certificate in Lab Methods. The best way I found to understand the SI metric system is to work in and with it not convert, but compare. I am 170 cm and 67.9 kg. A meter is about floor to waist height. A kilogram is 1000 grams and a gram is 1000 mg. A kilogram is about six pieces of fruit. A idea ones learns for medication is a Ld (lethal dose) measured in mg substance/kg body weight. There is no better conversion in US standard. So I suggest make comparision for yourself. A one cent coin is two grams. Be Well! Ed