Pounds to Kilograms Converter

Common lb to kg conversions

How this conversion works

1 pound = 0.45359237 kilograms. Multiply pounds by 0.45359237.

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What you are converting

Pound

A pound (lb) is a unit of mass in the imperial and US customary systems, defined internationally as exactly 0.45359237 kilograms since 1959. Real-world anchor: a typical loaf of sandwich bread weighs about one pound.

Kilogram

A kilogram (kg) is the base unit of mass in the International System of Units, used worldwide for body weight, food packaging, and shipping. Real-world anchor: a one-liter bottle of water weighs almost exactly one kilogram.

Why convert and when you would use this

Travelers weigh luggage on a bathroom scale showing pounds but must meet airline limits stated in kilograms, so conversion prevents surprise fees at check-in. Shoppers and athletes likewise translate product weights, dumbbells, or body-weight targets between US-imperial labels and metric specifications.

Worked example

To convert 150 pounds to kilograms, multiply 150 by 0.45359237: 150 x 0.45359237 = 68.0388555 kg. Rounded to two decimal places, a person weighing 150 lb weighs about 68.04 kg. The same method works for any value: multiply the pound figure by 0.45359237.

Rounding and accuracy

Use two decimal places for everyday results such as body weight, luggage, and package labels; 68.04 kg is precise enough. Keep four or more decimals when summing many items for shipping, and retain the full 0.45359237 factor in engineering or scientific work to prevent rounding drift.

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