Pound conversions

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What is pound?

The international avoirdupois pound (also pound-mass or simply "pound") is a unit of mass in the Imperial and US customary systems of units equal to 0.45359237 kilograms (1lb = 0.45359237 kg), the base unit of mass in the International System of Units (SI). It is also equal to 453.59237 grams (g), or 453,592.37 milligrams (mg) or 453.59237x106 micrograms (μg) (SI units of mass), or 16 ounces (oz), or 7,000 grains (gr) or 1.2152777(7) troy pounds (lb t), which are US customary / Imperial units of mass.

The pound definition varies depending on the system of units used, as follows:

  • The avoirdupois pound (or simply "pound"), equal to 453.59237 grams (g) or 0.45359237 kilograms (kg)
  • The troy pound, equal to 373.2417216 grams (g) or 0.3732417216 kilograms (kg)
  • The metric pound, equal to 500 grams (g) or 0.5 kilograms (kg)

Over time, various pounds have been recorded. Examples of pound units include:

  • The tower pound, equal to about 350 grams (g) or 0.350 kilograms (kg)
  • The merchant's pound, equal to about 437.5 grams (g) or 0.4375 kilograms (kg)
  • The London pound, equal to about 466.66 grams (g) or 0.46666 kilograms (kg)
  • The Roman libra, equal to about 327 grams (g) or 0.327 kilograms (kg)
  • The Russian pound (or funt), equal to about 409.52 grams (g) or 0.40952 kilograms (kg)
  • The Jersey pound, equal to about 490 grams (g) or 0.490 kilograms (kg)

(i) The name "pound" comes from the Latin phrase "libra pondo" which means "a pound weight"
(ii) The abbreviation "lb" for pound comes from the Roman "libra"; the "lbs" abbreviation is also commonly used to indicate the plural unit "pounds"





Also called:

pound (plural: pounds, symbol: lb, lbs (informal)), pound-mass (symbol: lbm)