How many hundredweight are in a UK ton?
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Hundredweight Ton
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 "hundredweight".

* The short hundredweight or cental of 100 lb (45.359237 kg) is used in the US  and Canada.
* The long or imperial hundredweight of 8 stone (112 lb or 50.802345 kg) sees informal use in the imperial system  but according to Schedule 1, Part VI of the Weights and Measures Act 1985, no longer to be used for trade after the Act came into force. 

Under both conventions, there are 20 hundredweight in a ton, producing a "short ton" of 2000 lb and a "long ton" of 2240 lb.

History

The hundredweight has had many different values. In England in around 1300, various different "hundreds" (centem in Medieval Latin) were defined. The Weights and Measures Act of 1835 formally established the present imperial hundredweight of 112 lb. The use in trade of measures by "cental", "hundredweight", or "quintal"  have now been banned in the United Kingdom under the Weights and Measures Act of 1985.

The United States and Canada came to use the term "hundredweight" to refer to a unit of 100 lb. This measure was specifically banned from British use—upon risk of being sued for fraud—by the Weights and Measures Act of 1824 but, in 1879, the measure was legalized under the name "cental" in response to legislative pressure from British merchants importing wheat and tobacco from the United States. 

Use

The short hundredweight is commonly used in the US in the sale of livestock and some cereal grains  and oilseeds, paper, and concrete additives and on some commodities in futures exchanges 

A few decades ago, commodities weighed in terms of long hundredweight included cattle, cattle fodder, fertilizers, coal, some industrial chemicals, other industrial materials, and so on. However, since increasing metrication in most English-speaking countries, it is now less used. Church bell ringers use the unit commonly,  although church bell manufacturers are increasingly moving over to the metric system. 

Older blacksmiths' anvils are often stamped with a three-digit number indicating their total weight in hundredweight, quarter-hundredweight (28 lb), and pounds. Thus, an anvil stamped "1.1.8" will weigh 148 lb (112 lb + 28 lb + 8 lb). The ton is a unit of measure. It has a long history and has acquired a number of meanings and uses over the years. It is used principally as a unit of mass. Its original use as a measurement of volume has continued in the capacity of cargo ships and in terms such as the freight ton. It can also be used as a measure of energy, for truck classification, or as a colloquial term.

It is derived from the tun, the term applied to a cask of the largest size. This could contain a volume between 175 and, which could weigh around  and occupy some 60 cuft of space.. "Historically, a very important and standard cargo for European sailing vessels was wine, stored and shipped in casks called tuns. These tuns of wine, because of their uniform size and their universal demand, became a standard by which a ship's capacity could be measured. A tun of wine weighed approximately 2,240 pounds, and occupied nearly 60 cubic feet." (Gillmer, Thomas (1975). Modern Ship Design. United States Naval Institute.) "Today the ship designers standard of weight is the long ton which is equal to 2,240 pounds."

In the United Kingdom the ton is defined as 2,240 avoirdupois pounds (1,016 kg).  From 1965 the UK embarked upon a programme of metrication and gradually introduced metric units, including the tonne (metric ton), defined as 1000 kg (2,204.6 lbs). The UK Weights and Measures Act 1985 explicitly excluded from use for trade many units and terms, including the ton and the term "metric ton" for "tonne". 

In the United States and formerly Canada a ton is defined to be 2000 lb.

Where confusion is possible, the 2240 lb ton is called "long ton" and the 2000 lb ton "short ton"; the tonne is distinguished by its spelling, but usually pronounced the same as ton, hence the US term "metric ton". In the UK the final "e" of "tonne" can also be pronounced (/ˈtʌnɪ/),  or "metric ton" when it is necessary to make the distinction.

Where accuracy is required the correct term must be used, but for many purposes this is not necessary: the metric and long tons differ by only 1.6%, and the short ton is within 11% of both. The ton is the heaviest unit of weight referred to in colloquial speech.

The term "ton" is also  used to refer to a number of units of volume, ranging from 35 to in capacity.

It can also be used as a unit of energy, expressed as an equivalent of coal burnt or TNT detonated.

In refrigeration, a ton is a unit of power, sometimes called a ton of refrigeration.  It is the power required to melt or freeze one short ton of ice per day.  The refrigeration ton·hour is a unit of energy, the energy required to melt or freeze  short ton of ice.

Units of mass/weight

There are several similar units of mass or volume called the ton:

Others

*The long ton is used for petroleum products such as aviation fuel.
*Deadweight ton (abbreviation 'DWT' or 'dwt') is a measure of a ship's carrying capacity, including bunker oil, fresh water, ballast water, crew and provisions. It is expressed in tonnes (1000 kg) or long tons (2240 pounds, about 1016 kg). This measurement is also used in the U.S. tonnage of naval ships.
* Increasingly, tonnes are being used rather than long tons in measuring the displacement of ships. See tonnage.
*Harbour ton used in South Africa in the 20th century, 2000 pounds or one short ton.

Both the long ton and the short ton are 20 hundredweight, being 112 and 100 pounds respectively. Before the twentieth century there were several definitions. Prior to the 15th century in England, the ton was 20 hundredweight, each of 108 lb, giving a ton of 2160 lb.  In the nineteenth century in different parts of Britain, definitions of 2240, 2352, and 2400 lb were used, with 2000 lb for explosives; the legal ton was usually 2240 lb. 

Assay ton (abbreviation 'AT') is not a unit of measurement, but a standard quantity used in assaying ores of precious metals; it is  grams (short assay ton) or  grams (long assay ton), the amount which bears the same ratio to a milligram as a short or long ton bears to a troy ounce. In other words, the number of milligrams of a particular metal found in a sample of this size gives the number of troy ounces contained in a short or long ton of ore.

In documents that predate 1960 the word ton is sometimes spelled tonne, but in more recent documents tonne refers exclusively to the metric ton.

In nuclear power plants tHM and MTHM mean tonnes of heavy metals, and MTU means tonnes of uranium. In the steel industry, the abbreviation THM means 'tons/tonnes hot metal', which refers to the amount of liquid iron or steel that is produced, particularly in the context of blast furnace production or specific consumption.

A dry ton or dry tonne has the same mass value, but the material (sludge, slurries, compost, and similar mixtures in which solid material is soaked with or suspended in water) has been dried to a relatively low, consistent moisture level (dry weight). If the material is in its natural, wet state, it is called a wet ton or wet tonne.

Units of volume

The displacement, essentially the weight, of a ship is traditionally expressed in long tons. To simplify measurement it is determined by measuring the volume, rather than weight, of water displaced, and calculating the weight from the volume and density. 
For practical purposes the displacement ton (DT) is a unit of volume, 35 cuft, the approximate volume occupied by one ton of seawater (the actual volume varies with salinity and temperature).  It is slightly less than the 224 imperial gallons (1.018 m3) of the water ton (based on distilled water).

One measurement ton or freight ton is equal to 40 cuft, but historically it has had several different definitions. It is sometimes abbreviated as "MTON".     The freight ton represents the volume of a truck, train or other freight carrier. In the past it has been used for a cargo ship but the register ton is now preferred. It is correctly abbreviated as "FT" but some users are now using freight ton to represent a weight of 1 t, thus the more common abbreviations are now M/T, MT, or MTON (for measurement ton), which still cause it to be confused with the tonne, or even the megatonne.

The register ton is a unit of volume used for the cargo capacity of a ship, defined as 100 cuft. It is often abbreviated RT or GRT for gross registered ton (The former providing confusion with the refrigeration ton). It is known as a tonneau de mer in Belgium, but, in France, a tonneau de mer is .

The Panama Canal/Universal Measurement System (PC/UMS) is based on net tonnage, modified for Panama Canal billing purposes. PC/UMS is based on a mathematical formula to calculate a vessel's total volume; a PC/UMS net ton is equivalent to 100 cubic feet of capacity. 

The water ton is used chiefly in Great Britain, in statistics dealing with petroleum products, and is defined as 224 impgal,  the volume occupied by 1 long ton of water under the conditions that define the imperial gallon.

Units of energy and power

Ton of TNT

*A ton of TNT or tonne of TNT is a unit of energy equal to 109 (thermochemical) calories, also known as a gigacalorie (Gcal), equal to 4.184 gigajoules (GJ).
*A kiloton of TNT or kilotonne of TNT is a unit of energy equal to 1012 calories, also known as a teracalorie (Tcal), equal to 4.184 terajoules (TJ).
*A megaton of TNT (1,000,000 metric tonnes) or megatonne of TNT is a unit of energy equal to 1015 calories, also known (infrequently) as a petacalorie (Pcal), equal to 4.184 petajoules (PJ).

Note that these are small calories (cal). The large or dietary calorie (Cal) is equal to one kilocalorie (kcal), and is gradually being replaced by the latter correct term.

Early values for the explosive energy released by trinitrotoluene (TNT) ranged from 900 to 1100 calories per gram. In order to standardise the use of the term TNT as a unit of energy, an arbitrary value was assigned based on 1000 calories (1 kcal) per gram. Thus there is no longer a direct connection to the chemical TNT itself. It is now merely a unit of energy that happens to be expressed using words normally associated with mass (e.g., kilogram, tonne, pound).[http://www.iaea.org/About/Policy/GC/GC42/Documents/gc42inf3.pdf GC(42)/INF/3 - Measures to Strengthen Co-operation in Nuclear, Radiation and Waste Safety]  The definition applies for both spellings: ton of TNT and tonne of TNT.

Measurements in tons of TNT have been used primarily to express nuclear weapon yields, though they have also been used since in seismology as well.

Tonne of oil equivalent

A tonne of oil equivalent (toe), sometimes ton of oil equivalent, is a conventional value, based on the amount of energy released by burning one tonne of crude oil. The unit is used, for example, by the International Energy Agency (IEA), for the reported world energy consumption as TPES in millions of toe (Mtoe). 

Other sources convert 1 toe into 1.28 tce  One toe is also define as 6.6–8.0 actual barrels of oil (boe), depending on actual specific gravity.

Tonne of coal equivalent

A tonne of coal equivalent (tce), sometimes ton of coal equivalent, is a conventional value, based on the amount of energy released by burning one tonne of coal. Plural name is tonnes of coal equivalent.
* Per the World Coal Association: 1 tonne of coal equivalent (tce) corresponds to 0.697 tonne of oil equivalent (toe) 
* Per the International Energy Agency 1 tonne of coal equivalent (tce) corresponds to 0.700 tonne of oil equivalent (toe)

Refrigeration 

The unit ton is used in refrigeration and air conditioning to measure the rate of heat absorption. Prior to the introduction of mechanical refrigeration, cooling was accomplished by delivering ice.  Installing one ton of mechanical refrigeration capacity replaced the daily delivery of one ton of ice.

* In North America, a standard ton of refrigeration is 12000 BTU/h. "The heat absorption per day is approximately the heat of fusion of 1 ton of ice at 32 °F."  This is approximately the power required to melt one short ton (2000 lb) of ice at 0 C in 24 hours, thus representing the delivery of 1 ST of ice per day.
* A less common usage is the power required to cool 1 long ton (2240 lb 1 LT) of water by 1 F-change every 10 minutes 
 .  

A refrigeration ton should be regarded as power produced by a chiller when operating in standard AHRI conditions, which are typically 44 °F for chilled water unit, and 95 °F air entering the condenser. This is commonly referred to as "true ton". Manufacturers can also provide tables for chillers operating at other chilled water temperature conditions (as 65 °F) which can show more favorable data, which are not valid when making performance comparisons among units unless conversion rates are applied.

The refrigeration ton is commonly abbreviated as RT.

Informal tons

*Ton is also used informally, often as slang, to mean a large amount of something, material or not.  For example, "I have a ton of homework to do this weekend."
*In Britain, a ton is colloquially used to refer to 100 of a given unit. Ton can thus refer to a speed of 100 miles per hour, and is prefixed by an indefinite article, e.g. "Lee was doing a ton down the motorway"; to money e.g. "How much did you pay for that?" "A ton" (£100); to 100 points in a game e.g. "Eric just threw a ton in our darts game" (in some games, e.g. cricket, more commonly called a century); or to a hundred of any other countable figure.   
*In Dutch, when talking about money a ton is used to indicate 100,000. For example a house costing 2 ton would cost 200,000 euros.   This convention has been in use since at least the 18th century. 
*In Finnish, tonni is often used as a synonym for one thousand (1000), especially when referring to money. For example, "tonnin seteli" was a 1000 mark's banknote and a popular TV show was called "Kymppitonni" ("ten tons" = 10,000 marks).
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