Lets do this in stages. 18 stone equals 252 pounds, so we really want to convert 263 pounds to kilograms:
263
lb
* 1 kg
2.2046 lb
= 119.2947933
kg
So, 263 lbs is equal to 119.2947933 k
gs
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1 stone = 14 lbs
1 kg = 2.2 lbs
Therefore, 18 stone 3 lbs = 756 lbs = 342.916 kg
Weight in a stone depends on how big the stone is, so there technically is no true answer to how much weight there is in a stone. Romans used to use stones to measure weight, but soon they realized that each stone is a different size, and they needed to stop using stones.
There are 14 pounds in a stone. To convert kilograms to stones and pounds, divide the weight in kilograms by 0.453592 to get the weight in pounds, then divide the weight in pounds by 14 to get the weight in stones and pounds.
One stone is equivalent to 14 pounds.
2 stone = 28 pounds. (note: weight of a stone was redefined in 1340 to 14 pounds, before that it was 12 pounds)
50 pounds = 3.6 stone.