lbs to kg converter

How to convert pounds to kilograms

Multiply pounds by 0.45359237 to get kilograms. That constant is the definition, so 1 lb is exactly 0.45359237 kg and 10 lb is exactly 4.5359237 kg. The display rounds that. A common mistake is to divide by 2.2, which is the rough inverse of the other direction and does not land on the defined kilogram. One hundred pounds is 45.359237 kg, not 45.45.

US recipes that list pounds of produce, freight quotes, and body weight recorded in pounds all need this direction before they can sit next to a metric chart. A 50 lb dog-food bag is 22.680 kg. Baggage rules that say 50 lb are the same mass.

Exact formula

Formulakilograms = pounds × 0.45359237

kilograms = pounds × 0.45359237 One lb is 0.45359237 kg. Ten lb is 4.5359237 kg. The worked example below uses that same conversion.

Conversion table

The pounds column runs from 1 lb (0.4536 kg) through 1000 lb (453.59 kg).

Worked example: Pounds to Kilograms

Someone who weighs 150 lb is 68.039 kg, from multiplying by the defined 0.45359237. Dividing 150 by 2.2 lands near 68.2 and is a different number. A single pound is 0.4536 kg. A 50 lb dog-food bag, and a 50 lb airline limit, is 22.68 kg. If the weight was spoken as stone and pounds, expand the stone to 14 lb first, then multiply. A kitchen ounce is 1/16 of this pound. A fluid ounce is not.

Pitfalls for pounds to kilograms

• Dividing by 2.2 is not the inverse of the defined pound. Use 0.45359237.
• The ounce on a kitchen scale in the US is 1/16 of this pound, not a fluid ounce and not a troy ounce.
• Stone is 14 lb. If someone says '11 stone 6', convert the pounds first (11 × 14 + 6) and then multiply.
• Force in pounds-force is a different unit. This page is mass.