# Avoirdupois (U.S. / British) Conversion Calculator

To use the calculator, place your cursor in the desired unit field and write a number. If needed use the dot "." as the decimal separator.

LT
ST
cwt long
cwt short
st
lb
oz

## Did you know?

Use the overview below to better understand the meaning and history of the different weight units.

• ##### Imperial Ton `(1,016,046.90 grams)`
Long ton, also known as the imperial ton or displacement ton, is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements. It was standardised in the thirteenth century and is used in the United Kingdom and several other British Commonwealth of Nations countries alongside the mass-based metric tonne defined in 1799.
• ##### US Ton `(907,184.74 grams)`
An unit of weight, equivalent to 2000 pounds (0.907 metric ton) avoirdupois (short ton) in the U.S. and 2240 pounds (1.016 metric tons) avoirdupois (long ton) in Great Britain. 2. Also called freight ton.
• ##### Long Hundredweight `(50,802.34 grams)`
The hundredweight (abbreviation: cwt), formerly also known as the centum weight or quintal, is an English, imperial, and US customary unit of weight or mass of various values. Its present value continues to differ between the American and imperial systems. The two values are distinguished in American English as the "short" and "long" hundredweight and in British English as the "cental" and the "imperial hundredweight". The long or imperial hundredweight of 8 stone (112 lb or 50.802345 kg) is in informal use in the imperial system but its use for trade in the UK was ended by Schedule 1, Part VI of the Weights and Measures Act 1985.
• ##### Short Hundredweight `(45,359.24 grams)`
The hundredweight (abbreviation: cwt), formerly also known as the centum weight or quintal, is an English, imperial, and US customary unit of weight or mass of various values. Its present value continues to differ between the American and imperial systems. The two values are distinguished in American English as the "short" and "long" hundredweight and in British English as the "cental" and the "imperial hundredweight". The short hundredweight or cental of 100 lb (45.359237 kg) is used in the US and Canada.
• ##### Stone `(6,350.29 grams)`
The stone or stone weight (abbreviation: st.) is an English and imperial unit of mass now equal to 14 pounds (6.35029318 kg). England and other Germanic-speaking countries of northern Europe formerly used various standardised "stones" for trade, with their values ranging from about 5 to 40 local pounds (roughly 3 to 15 kg) depending on the location and objects weighed. The United Kingdom's imperial system adopted the wool stone of 14 pounds in 1835. With the advent of metrication, Europe's various "stones" were superseded by or adapted to the kilogram from the mid-19th century on. The stone continues in customary use in Britain and Ireland used for measuring body weight, but was prohibited for commercial use in the UK by the Weights and Measures Act of 1985.
• ##### Pound `(453.59 grams)`
It is not to be confused with the short ton a unit of weight equal to 2,000 pounds (907.18474 kg) used in the United States and in Canada before metrication also referred to simply as a "ton".
• ##### Ounce `(28.34 grams)`
The ounce (abbreviated oz) is a unit of mass, weight, or volume used in most British derived customary systems of measurement. The common avoirdupois ounce (approximately 28.3 g) is 1⁄16 of a common avoirdupois pound; this is the United States customary and British imperial ounce. It is primarily used in the United States to measure packaged foods and food portions, postal items, areal density of fabric and paper, boxing gloves, and so on; but sometimes also elsewhere in the Anglosphere.
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