Here’s an fast and easy way to convert pounds to kg. Just type in what you want to convert to kg’s below and press convert on the pounds to kg calculator.
Convert Pounds to Kilo
if you want to convert kg to pounds instead use the kg to pounds calculator below.
Convert Kilo to Pounds
Since the pound is defined as 0.45359237 kilograms (kg) it can be calculated from pounds to kg from this. However it’s more common to convert according to method 1 bellow.
1 kg = 2.2046 pounds is not 100% right but often close enough and commonly used when converting pounds to kg or converting pounds to kg. So pounds to kg then becomes:
pounds / 2.2046 = kilos OR kilos x 2.2046 = pounds.
This is exact and uses the avoirdupois definition:
pounds x 0.45359237 = kilos OR or kilos / 0.45359237 = pounds.
The first method is easier to remember an more often used but the second is totally correct but maybe not as easy to calculate fast in your head.
Example 1 – convert 125 pounds
Let’s try to convert pounds to kg according to the first method and find out the 125 pounds kg representation.
125 pounds / 2.2046 = 56.6996 kg
Now let’s try that again according to the second method.
125 pounds x 0.45359237 = 56.6990 kg
The differences between the results using two methods is very small, but still the second method is 100% correct.
Example 2 – convert 65 kg
Let’s try to convert 65 kg into pounds according to the first method.
65 kg x 2.2046 = 143.2990 pounds
Now let’s try that again according to second method.
65 kg / 0.45359237 = 143.3005 pounds
No mater which method we use we still end up with about 143 pounds in kg is 65 kg. Still the second one is the most correct.
If you want to make it easy on yourself use the pounds to kg calculator.
Converting pounds to kg is one thing, but exactly what is pounds and kilos?
Let´s start with the pounds definition..
The Pound, also referred to as pound-mass, is a unit of mass and is used in the imperial, United States customary and also other systems of measurement.
The exact definition of the pound today according to the avoirdupois ( a system based on a pound of 16 ounces) is exactly 0.45359237 kilograms (kg).
The abbreviation for the pound is “lb” and comes from Roman libra, since the unit pound is an descendant from this. It’s also common to see the abbreviation “lbs” for pounds.
The name pound is a Germanic adaptation of the Latin phrase libra pondo, a pound by weight.
The Pound historically has varied a lot since there has been many different kinds of pound. For example the Imperial Standard Pound, Troy pound, tower pound, London pound and so on..
When we say we want to convert pounds to kg today anyway, we usually mean the avoirdupois definition to the current standard definition of kilos (kg).
So one pound = 0.45359237 kilograms (kg).
So if you as an example want the 120 pounds kg representation that’s 120 x 0.45359237 = 54.4310844 kg.
Enough about the pound, and on to the definition of Kilograms (aka kilos or kg). First of all kilo´s definition is one thousand (1000), so kilogram actually means 1000 grams.
Now the old definition of 1 kg was the mass of 1 liter of water at the temperature of 4 degrees celsius ( 39.2 degrees Farenheit ) but this definition was found to be to inexact.
The new definition is defined by an object called the International Prototype Kilogram(IPK) and is stored at the International Bureau of Weights and Measures. The IPK is made of 90% platinum and 10% iridium (by mass) to minimize oxidation and has two times the density of lead.
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