This depends on the substance you are measuring. If you are measuring water:
1 US gallon weighs 3.78541178 kg
1 UK (Imperial) gallon weighs 4.54609118 kg
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12.25 pounds is approximately 5.56 kilograms. You can convert pounds to kilograms by dividing the weight in pounds by 2.205.
166.6 pounds is equal to approximately 75.6 kilograms.
20 tons is equal to 40,000 pounds because 1 ton is equivalent to 2,000 pounds.
Assuming it's a gas, 0.717kg
If we assume an average weight of one stone to be 6.35 kgs, then 73 kgs would be approximately 11.49 stones.