What is a milligram?
A milligram is one thousandth of a gram. Medication doses are usually given in milligrams – a standard paracetamol tablet is 500 milligrams.
What is a stone?
A stone is 14 pounds, or about 6.35 kilograms, and the United Kingdom and Ireland use it almost entirely for body weight. Elsewhere people use kilograms or pounds.
We provide a calculator on this site to convert stones to kilograms.