Pounds to Kilograms Conversion
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The pound or pound-mass is most commonly known as the international avoirdupois pound, which is legally defined as exactly 0.45359237 kilograms, and which is divided into 16 avoirdupois ounces. The international standard symbol for the avoirdupois pound is lb.

The kilogram (also kilogramme) is the base unit of mass in the metric system having the unit symbol kg. It is a widely used measure in science, engineering, and commerce worldwide, and is often called a kilo. The kilogram is about to the mass of one litre of water.

It is a calculator or tool used to convert lbs (pounds) to kgs (kilograms).

1 pound (lb) is equal to 0.45359237 kilograms (kg).
1 lb = 0.45359237 kg
The mass m in kilograms (kg) is equal to the mass m in pounds (lb) times 0.45359237: m(kg) = m(lb) × 0.45359237

Example
Convert 10 lb to kilograms: m(kg) = 10 lb × 0.45359237 = 4.536 kg

The gram (alternative spelling: gramme; SI unit symbol: g; Latin: gramma, from Greek γράμμα, grámma) is a metric system unit of mass.
Originally defined as "the absolute weight of a volume of pure water equal to the cube of the hundredth part of a meter [1 cm^3], and at the temperature of melting ice" (later at 4 °C, the temperature of maximum density of water). However, in a reversal of reference and defined units, a gram is now defined as one-thousandth of the SI base unit, the kilogram, or 1×10−3 kg, which itself is now defined by the International Bureau of Weights and Measures, not in terms of grams, but by "the amount of electricity needed to counteract its force."