Hundred weight or hundredweight is a unit of measurement for mass in U.S. customary units and was historically used in the Imperial system in the United Kingdom and the British Commonwealth. However, its definition differs in the two systems. In Imperial units, a hundredweight ('long') is defined as 112 pounds avoirdupois, or 8 stone, or four quarters (50.80234544 kg). This is so close to 50 kg that the transition to metric equivalents has been easy. In U.S. customary units, a hundredweight ('s… (More on Hundredweight)