The milligram (mg) is a tiny metric unit of mass equal to one-thousandth of a gram, essential in pharmaceuticals and nutrition labeling. Medication dosages, vitamin content, and food additive quantities are typically expressed in milligrams. One milligram equals approximately 0.0000353 ounces, making it the go-to unit for measuring extremely small masses.

The stone (st) is a British imperial unit equal to 14 pounds or about 6.35 kilograms, traditionally used in the United Kingdom and Ireland for body weight. When someone in the UK says they weigh 11 stone, they mean 154 pounds, a convention that persists in everyday conversation and medical records. One stone equals exactly 6.35029 kilograms.