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.
There are two types of hundredweights
There are two types of hundredweights; long and short.
The long hundredweight, also known as the imperial hundredweight, is 112 pounds or about 50.802 kilograms, so 20 of them make a long ton.
The short hundredweight, also known as the net hundredweight, is the American one and is exactly 100 pounds, so 20 of them make a short ton. Milk and cattle prices in the United States are still quoted per hundredweight.