Back to Weight

pound (lb) → kilogram (kg)

Instant conversion - enter value to see result

Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

0
lb=kg
0.01=0.004536
0.1=0.045359
1=0.453592
2=0.907184
3=1.360776
5=2.26796
10=4.53592
20=9.07184
50=22.6796
100=45.3592
1000=453.592

Popular conversions

More conversions in this category

Brief explanation: pound to kilogram

Kilogram is the base unit of mass in the metric system. Pound ≈ 0.453 kg, ounce = 28.35 g. Ton = 1000 kg. Weight and mass are often used interchangeably in everyday contexts. The metric system (kg, g, mg) is used globally. Pounds and ounces are common in the US and UK. For cooking, grams are precise; for body weight, kg or lb are standard.

Related converters

Common conversion examples: pound to kilogram

Reference values for quick comparison. Use the converter above for any amount.

  • 1 pound=0.4536 kilogram
  • 10 pound=4.5359 kilogram
  • 100 pound=45.3592 kilogram

About the Units

pound (lb)

Definition: A pound (lb) is a unit of mass in the imperial and US customary systems. The international avoirdupois pound equals exactly 0.45359237 kilograms, or 16 ounces. It is the primary weight unit in the US.
History: The pound has Roman origins (libra). The avoirdupois pound of 16 ounces became standard in England. The international pound was standardized in 1959 for consistency between the US and UK.
Current use: Pounds are used for body weight, produce, and meat in the US and UK. Shipping weights and gym equipment often use pounds. Most of the world uses kilograms for weight.

kilogram (kg)

Definition: The kilogram (kg) is the base unit of mass in the International System of Units (SI). It is defined by the Planck constant since 2019. One kilogram is approximately the mass of one liter of water at 4°C.
History: The kilogram was originally defined in 1795 as the mass of one liter of water. From 1889 to 2019, it was defined by a platinum-iridium cylinder (the International Prototype Kilogram) stored in Paris. The current definition uses fundamental physical constants.
Current use: The kilogram is the global standard for mass. Body weight, food packaging, and cargo are measured in kilograms worldwide. Science and commerce rely on kilograms. The US still uses pounds for everyday weight.

Sources

Kilograms and pounds are the standard weight units worldwide. Use this when checking luggage limits, comparing product weights, or converting body weight. 1 kg ≈ 2.205 lb.

Conversion factors and unit definitions follow international standards. For authoritative references, see: