Convert Hundredweight (US) (cwt (US)) to Kilogram (kg) instantly.
About these units
Hundredweight (US) (cwt (US))
The US hundredweight equals 100 pounds (45.359237 kg) and is used in agriculture, livestock markets, and commodity trading. Farmers often price hay, grain, and cattle by the hundredweight. The oil and chemical industries also use it for bulk goods. Its relation to the ton (20 cwt = 1 US ton) integrates it smoothly into the US customary system. Although it complicates international trade due to conflicting definitions with the UK version, the US hundredweight remains essential in domestic commerce.
Kilogram (kg)
The kilogram is the base unit of mass in the SI system and the only SI unit defined directly by a fundamental constant rather than a physical object. Originally, its definition was tied to a platinum–iridium artifact stored in France—the famous "International Prototype Kilogram." Over time, tiny mass changes in the prototype and its official copies created difficulties for high-precision science. In 2019, the kilogram was redefined using Planck's constant, linking mass to the laws of quantum physics through the Kibble balance. This innovation ensures universality, stability, and reproducibility across the world. The kilogram is central to commerce, science, engineering, and every quantitative field dealing with matter. Its decimal relationships with other metric units (grams, milligrams, tons) make it universally convenient. From groceries to spacecraft mass budgets, the kilogram anchors modern mass measurement.