Ounces to Long Tons (oz to ton (UK))

1 ounce equals 0.00002790178571 long tons (rounded).

1 ounce = 0.00002790178571 long tons

How to convert ounces to long tons

To convert ounces to long tons, multiply the number of ounces by 0.00002790178571. The factor is rounded to 10 significant digits. To go the other way, multiply long tons by 35,840.

long tons = ounces × 0.00002790178571

Example: 10 ounces = 0.0002790178571 long tons.

About these units

Ounce (oz)

US & ImperialCurrent unit

One sixteenth of a pound, exactly 28.349523125 g. Used for food, mail and consumer goods in the US and UK.

A twelfth part is what ounce originally meant. It comes from the Roman uncia, one twelfth of the Roman pound, a word that also gave English the inch. The abbreviation oz does not come from English at all but from the Italian onza or oncia. Over the centuries many regions and trades used different ounces: the English Tower ounce of 29.16 g was abolished by Henry VIII in 1527, and the Dutch ons was redefined as exactly 100 g in 1820.

The avoirdupois ounce used for everyday goods is one sixteenth of a pound, exactly 28.349523125 g or 437.5 grains, the standard in the US and under the UK imperial system. It is not the same as the troy ounce for precious metals, and neither is the fluid ounce, which measures volume. Ounces still describe portions such as steaks and burgers, and they show up in unexpected places: fabric is graded by weight per area, so a 16 oz denim is a heavy cloth, and the copper on a circuit board is specified in ounces, where 1 oz is roughly 34.7 micrometres thick.

1 ounce = 0.02834952313 kilograms (approximately).

Sources: Wikipedia: Ounce; NIST Guide to the SI, Appendix B.8 (mass conversions)

Long Ton (ton (UK))

Imperial (British)Current unit

2,240 pounds (1,016.05 kg), the imperial or UK ton. Also used for ship displacement.

Before the 15th century an English ton was 2,160 pounds, twenty hundredweight of 108 pounds. Nineteenth-century British definitions included 2,240, 2,352 and 2,400 pounds, though the legal ton was usually 2,240 lb, which is twenty hundredweight of 112 lb. Industry bent the rules: in the 17th and 18th century iron trade, workers were given a 2,240 lb ton of raw material but were expected to return a 2,400 lb ton of processed iron, allowing for waste, and some coal mines delivered long tons but paid miners for a shorter one, which the miners saw as unfair.

The long ton, about 1,016 kg, is within 2 percent of the metric tonne, which makes the two easy to mistake for each other. It is used in the UK, Ireland and most Commonwealth countries that followed the imperial system, although the tonne is now the legal trade unit in the UK, Canada and Australia. Ship displacement has traditionally been quoted in long tons, because a ship cannot be put on a scale and is instead measured by the weight of water it pushes aside. The 2,240 lb figure became the standard for ship design.

1 long ton = 1,016.046909 kilograms (approximately).

Sources: Wikipedia: Ton; NIST Guide to the SI, Appendix B.8 (mass conversions)

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