# Carats to Hundredweights (UK) (ct to cwt) Source: https://www.unitconvertercalculator.com/weight/carats-to-long-hundredweights/ **1 ct = 3.9368261104442E-6 cwt** One carat equals approximately 3.937 x 10-6 long hundredweights. The long hundredweight (also called the imperial hundredweight) is 112 pounds or about 50.802 kilograms - roughly 254,012 carats. This conversion spans an enormous weight range, connecting the delicate world of gemstones to the industrial world of bulk commodity trading. ## Formula Apply the conversion factor ## Conversion Table | Carats (ct) | Hundredweights (UK) (cwt) | |---|---| | 1000 ct | 0.0039368261104442 cwt | | 5000 ct | 0.019684130552221 cwt | | 10000 ct | 0.039368261104442 cwt | | 50000 ct | 0.19684130552221 cwt | | 100000 ct | 0.39368261104442 cwt | | 250000 ct | 0.98420652761106 cwt | | 500000 ct | 1.9684130552221 cwt | | 1000000 ct | 3.9368261104442 cwt | | 2500000 ct | 9.8420652761106 cwt | | 5000000 ct | 19.684130552221 cwt | ## Units ### Carat (ct) A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used for measuring gemstones and pearls. Adopted internationally in 1907 by the Fourth General Conference on Weights and Measures. ### Hundredweight (UK) (cwt) A UK hundredweight (long hundredweight) is exactly 112 pounds or 50.80234544 kilograms. Used in British agriculture and traditional commerce. ## Background The long hundredweight was traditionally used in British commodity markets for weighing goods like coal, grain, and iron. A single long hundredweight of diamonds (254,012 carats) would be worth hundreds of millions of dollars and would represent a significant fraction of global annual diamond production. This conversion is purely theoretical for most purposes but relevant for understanding historical trade documents that mixed gemstone and commodity weight systems. ## Good to Know The long hundredweight reflects Britain's complex weight history. The 112-pound hundredweight descends from the medieval wool trade, where the standard sack of wool weighed 2 long hundredweights (224 pounds). This system was so entrenched that when the US adopted a simpler 100-pound hundredweight, the two countries spent decades creating confusion in transatlantic trade before metric tonnes eventually replaced both. ## FAQ ### How many carats are in one long hundredweight? One long hundredweight (112 pounds or about 50.802 kg) equals approximately 254,012 carats. This comes from dividing 50,802.3 grams by 0.2 grams per carat. ### What is the difference between a long and short hundredweight? The long (imperial) hundredweight is 112 pounds (50.8 kg), used in British Commonwealth countries. The short (US) hundredweight is 100 pounds (45.36 kg). Despite both being called 'hundredweight,' they differ by 12 pounds. ### Is the long hundredweight still used? The long hundredweight is largely obsolete, having been replaced by metric tonnes in most British and Commonwealth commerce. It occasionally appears in historical commodity trading records, agricultural contexts in the UK, and traditional brewing. ## Non-Frequently Asked Questions ### Could any vault in the world hold a long hundredweight of diamonds? Easily, in terms of physical space. A long hundredweight of diamonds is about 50.8 kilograms - roughly the weight of an average travel suitcase. But the value (hundreds of millions of dollars) would require a vault with security that makes Fort Knox look like a garden shed. ### Why is a hundredweight 112 pounds and not 100? The British long hundredweight evolved from a system where 1 hundredweight = 8 stone, and 1 stone = 14 pounds, giving 8 x 14 = 112 pounds. The Americans later simplified their hundredweight to 100 pounds. Neither system makes the name 'hundredweight' mathematically honest. ### If I dropped a long hundredweight of diamonds on my foot, would it hurt more than a long hundredweight of cotton? Both weigh 50.8 kg and would hurt equally from a gravity perspective. However, the diamonds would be concentrated in a much smaller volume (about 14.4 liters vs. hundreds of liters for cotton), so the pressure on your foot would be far higher. 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