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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.
A measure of Troy weight equalling 24 grains or the twentieth part of a Troy ounce (there are 12 ounces in a pound Troy). Pennyweight is usually abbreviated dwt.
| Kilograms | Pennyweights |
|---|---|
| 0kg | 0.00dwt |
| 1kg | 643.01dwt |
| 2kg | 1286.03dwt |
| 3kg | 1929.04dwt |
| 4kg | 2572.06dwt |
| 5kg | 3215.07dwt |
| 6kg | 3858.09dwt |
| 7kg | 4501.10dwt |
| 8kg | 5144.12dwt |
| 9kg | 5787.13dwt |
| 10kg | 6430.15dwt |
| 11kg | 7073.16dwt |
| 12kg | 7716.18dwt |
| 13kg | 8359.19dwt |
| 14kg | 9002.21dwt |
| 15kg | 9645.22dwt |
| 16kg | 10288.24dwt |
| 17kg | 10931.25dwt |
| 18kg | 11574.27dwt |
| 19kg | 12217.28dwt |
| Kilograms | Pennyweights |
|---|---|
| 20kg | 12860.30dwt |
| 21kg | 13503.31dwt |
| 22kg | 14146.33dwt |
| 23kg | 14789.34dwt |
| 24kg | 15432.36dwt |
| 25kg | 16075.37dwt |
| 26kg | 16718.39dwt |
| 27kg | 17361.40dwt |
| 28kg | 18004.42dwt |
| 29kg | 18647.43dwt |
| 30kg | 19290.45dwt |
| 31kg | 19933.46dwt |
| 32kg | 20576.48dwt |
| 33kg | 21219.49dwt |
| 34kg | 21862.51dwt |
| 35kg | 22505.52dwt |
| 36kg | 23148.54dwt |
| 37kg | 23791.55dwt |
| 38kg | 24434.57dwt |
| 39kg | 25077.58dwt |
| Kilograms | Pennyweights |
|---|---|
| 40kg | 25720.60dwt |
| 41kg | 26363.61dwt |
| 42kg | 27006.63dwt |
| 43kg | 27649.64dwt |
| 44kg | 28292.66dwt |
| 45kg | 28935.67dwt |
| 46kg | 29578.69dwt |
| 47kg | 30221.70dwt |
| 48kg | 30864.72dwt |
| 49kg | 31507.73dwt |
| 50kg | 32150.75dwt |
| 51kg | 32793.76dwt |
| 52kg | 33436.78dwt |
| 53kg | 34079.79dwt |
| 54kg | 34722.81dwt |
| 55kg | 35365.82dwt |
| 56kg | 36008.84dwt |
| 57kg | 36651.85dwt |
| 58kg | 37294.87dwt |
| 59kg | 37937.88dwt |