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lb to kg | Pounds to Kilograms Conversion

Pounds to Kilograms

= 0.45359237 kg

Divide by 2.205
for quick conversions

lb / 2.205 = kg


To convert lb to kg, use the conversion factor

1 kg = 2.20462262 lb

then divide both sides of the equation by kg, to get the conversion ratio

1 = 2.20462262 lb / kg

Use the conversion ratio to complete the unit conversion, basically dividing the input by 1, the lb units cancel out, and we are left with kg units.

1 lb ÷ 2.20462262 lb / kg
= 0.45359237 kg

Calculator Use

Convert avoirdupois pounds to kilograms including conversion options among ounces and grams. Generate a conversion factor and use this factor to do quick conversions from lb to kg with approximate results.

Pounds (lb) to Kilograms (kg) Formula

Kilograms is equal to pounds divided by 2.205 because 1 kilogram = 2.205 pounds.

lb ÷ 2.205 = kg

Formula to convert pounds lb to kilograms kg, kg = lb ÷ 2.205

Alternatively, take the reciprocol of 2.205 or 1/2.205 ≈ 0.4536, and you can now say kilograms is equal to pounds multiplied by 0.4536.

lb × 0.4536 = kg

Formula to convert pounds lb to kilograms kg, kg = lb × 0.4536

For Quick Conversions
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Understand the conversion of pounds (lb) to kilograms (kg)

Since 1 kilogram equals 2.205 pounds we can write this as an equation and create a conversion ratio.

1 kg = 2.205 lb

Divide both sides by 1 kilogram to get 1 equals 2.205 pounds per kilogram

1 = 2.205 lb/kg

If we have 5 lbs and divide by 1 we do not change the mass of the object.

Likewise, if we divide 5 lb by 2.205 lb/kg, the lb cancels and the division gives us 2.268 kg. The mass has not changed, we only converted the units. Simply put,

Divide pounds by 2.205

Similarly, you can show that 1 = 0.4536 kg/lb and 5 lb × 0.4536 kg/lb = 2.268 kg. Simply put,

Multiply pounds by 0.4536

1 pound is equal to exactly 0.45359237 kilograms (453.59237 grams). The factor 2.205 is obtained by calculating 1/0.45359237 and rounding to three decimal places. We use this to say 1 kilogram is about 2.205 pounds. Since there are exactly 0.45359237 kg/lb, we can convert between these units with more accuracy as follows:

Kilograms equals pounds multiplied by 0.45359237 kilograms per pound or,

kg = lb × 0.45359237 kg/lb

Example: 160 Pounds to Kilograms

You weigh 160 lbs, but you need to fill out a form with your weight in kilograms. Convert 160 lb to kg.

160 lb × 0.45359237 kg/lb

= 160 lb × 0.45359237 kg/lb ≈ 72.5747792 kg

and rounding to 72.57 kg is likely sufficient for this purpose.

Pound (avoirdupois)

A pound is a unit of mass and has the symbol lb. The pound is a unit of mass in the British imperial system of units and United States customary units where there are exactly 16 avoirdupois ounces in 1 avoirdupois pound. Pounds and ounces are commonly used for everyday weighing and measuring purposes such as groceries, body weight and the trade of goods. The avoirdupois pound is defined as exactly 0.45359237 kilograms. 1 lb = 0.45359237 kg.


The kilogram is a base unit of mass in the International System of Units and has the symbol kg. The kilogram is widely used in the context of science, as opposed to pounds, and more commonly in everyday use. Is used in some countries, where weights of groceries, cooking measures, body weight and goods are expressed in grams and kilograms. 1 kilogram is about 2.20462 avoirdupois pounds.


Cite this content, page or calculator as:

Furey, Edward "lb to kg | Pounds to Kilograms Conversion" at https://www.calculatorsoup.com/calculators/conversions/pounds-to-kilograms.php from CalculatorSoup, https://www.calculatorsoup.com - Online Calculators

Last updated: August 21, 2023

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