One pound equals 0.45359237 kg, to convert 51.21 pounds to kg we have to multiply the amount of pounds by 0.45359237 to obtain the amount in kg. 51.21 pounds is equal to 51.21 x 0.45359237 = 23.228465 kg.
One pound (lb), the international avoirdupois pound, is legally defined as exactly 0.45359237 kilograms.
The kilogram (kg) is the SI unit of mass. It is equal to the mass of the international prototype of the kilogram. This prototype is a platinum-iridium international prototype kept at the International Bureau of Weights and Measures. One kg is approximately equal to 2.20462262 pounds.
To calculate a pound value to the corresponding value in kilograms, just multiply the quantity in pounds by 0.45359237 (the conversion factor).
Kilograms = pounds * 0.45359237
The factor 0.45359237 is the result from the division 1 / 2.20462262 (kilogram definition). Therefore, another way would be:
Kilograms = Pounds / 2.20462262
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