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The kg is defined as being equal to the mass of the International Prototype of the Kilogram (IPK), a block of platinum-iridium alloy manufactured in 1889 and stored at the International Bureau of Weights and Measures in Sèvres, France.
It is the only SI unit that is defined by a physical object rather than a fundamental physical property that can be reproduced in laboratories.
Before approximately the 14th century there were two hundredweights in England, one of 100 pounds, and one of 108 pounds. In 1340, King Edward III changed the value of the stone from 12 pounds to 14 pounds. Since a hundredweight is 8 stones, the 100-pound hundredweight became 112 pounds.
| Kilograms | Long Hundredweights (UK) |
|---|---|
| 0kg | 0.00cwt long |
| 1kg | 0.02cwt long |
| 2kg | 0.04cwt long |
| 3kg | 0.06cwt long |
| 4kg | 0.08cwt long |
| 5kg | 0.10cwt long |
| 6kg | 0.12cwt long |
| 7kg | 0.14cwt long |
| 8kg | 0.16cwt long |
| 9kg | 0.18cwt long |
| 10kg | 0.20cwt long |
| 11kg | 0.22cwt long |
| 12kg | 0.24cwt long |
| 13kg | 0.26cwt long |
| 14kg | 0.28cwt long |
| 15kg | 0.30cwt long |
| 16kg | 0.31cwt long |
| 17kg | 0.33cwt long |
| 18kg | 0.35cwt long |
| 19kg | 0.37cwt long |
| Kilograms | Long Hundredweights (UK) |
|---|---|
| 20kg | 0.39cwt long |
| 21kg | 0.41cwt long |
| 22kg | 0.43cwt long |
| 23kg | 0.45cwt long |
| 24kg | 0.47cwt long |
| 25kg | 0.49cwt long |
| 26kg | 0.51cwt long |
| 27kg | 0.53cwt long |
| 28kg | 0.55cwt long |
| 29kg | 0.57cwt long |
| 30kg | 0.59cwt long |
| 31kg | 0.61cwt long |
| 32kg | 0.63cwt long |
| 33kg | 0.65cwt long |
| 34kg | 0.67cwt long |
| 35kg | 0.69cwt long |
| 36kg | 0.71cwt long |
| 37kg | 0.73cwt long |
| 38kg | 0.75cwt long |
| 39kg | 0.77cwt long |
| Kilograms | Long Hundredweights (UK) |
|---|---|
| 40kg | 0.79cwt long |
| 41kg | 0.81cwt long |
| 42kg | 0.83cwt long |
| 43kg | 0.85cwt long |
| 44kg | 0.87cwt long |
| 45kg | 0.89cwt long |
| 46kg | 0.91cwt long |
| 47kg | 0.93cwt long |
| 48kg | 0.94cwt long |
| 49kg | 0.96cwt long |
| 50kg | 0.98cwt long |
| 51kg | 1.00cwt long |
| 52kg | 1.02cwt long |
| 53kg | 1.04cwt long |
| 54kg | 1.06cwt long |
| 55kg | 1.08cwt long |
| 56kg | 1.10cwt long |
| 57kg | 1.12cwt long |
| 58kg | 1.14cwt long |
| 59kg | 1.16cwt long |