# Ounces to Long Tons (oz to long tn) Source: https://www.unitconvertercalculator.com/weight/ounces-to-long-tons/ **1 oz = 2.7901785714286E-5 long tn** One ounce equals approximately 0.0000279 long tons, or equivalently, one long ton contains 35,840 ounces. The long ton (also called the imperial ton or displacement ton) weighs 2,240 pounds and was the standard ton in Britain and the British Empire for centuries. ## Formula Apply the conversion factor ## Conversion Table | Ounces (oz) | Long Tons (long tn) | |---|---| | 1 oz | 2.7901785714286E-5 long tn | | 2 oz | 5.5803571428571E-5 long tn | | 5 oz | 0.00013950892857143 long tn | | 10 oz | 0.00027901785714286 long tn | | 25 oz | 0.00069754464285714 long tn | | 50 oz | 0.0013950892857143 long tn | | 100 oz | 0.0027901785714286 long tn | | 500 oz | 0.013950892857143 long tn | | 1000 oz | 0.027901785714286 long tn | ## Units ### Ounce (oz) An imperial and US customary unit of mass equal to approximately 28.35 grams. Commonly used in the US and UK for food and postal weight. ### Long Ton (long tn) A long ton (imperial ton) is a unit of mass equal to exactly 2,240 pounds or 1,016.0469088 kilograms. It is used primarily in the United Kingdom for shipping and naval displacement. ## Background Naval architects historically specified ship displacement in long tons, and the Royal Navy used the unit extensively through both World Wars. The long ton also served as the standard for British coal production statistics, iron ore trading, and agricultural bulk sales. In modern shipping, the long ton occasionally appears in contracts involving traditional commodities or when referencing historical tonnage records. ## Good to Know The long ton's 2,240-pound weight reflects its origin as 20 long hundredweights of 112 pounds each. This system allowed British merchants to use simple mental arithmetic: multiply hundredweights by 20 for tons, or divide tons by 20 for hundredweights. The long ton was the official unit for Royal Navy ship displacement until metrication, and many famous warship specifications from HMS Victory to the Dreadnoughts were recorded in long tons. ## FAQ ### How many ounces are in one long ton? One long ton contains exactly 35,840 ounces. This comes from 2,240 pounds per long ton multiplied by 16 ounces per pound. ### What is the difference between a long ton and a short ton? A long ton is 2,240 pounds (used in Britain), while a short ton is 2,000 pounds (used in the United States). The long ton is about 12 percent heavier than the short ton. Neither should be confused with the metric ton (tonne), which is 2,204.62 pounds. ### Is the long ton still used anywhere? The long ton has been largely replaced by the metric ton in international trade since Britain's metrication. It survives in some maritime contexts, particularly in older contracts, and the US Navy still occasionally uses it for calculating ship displacement. ## Non-Frequently Asked Questions ### Why are there three different types of tons? Because the British Empire, the United States, and the rest of the world could not agree on how heavy a ton should be. The result is the long ton (2,240 lbs), the short ton (2,000 lbs), and the metric ton (2,204.6 lbs), which are different enough to cause confusion but similar enough that you might not notice until it is too late. ### If I mailed 35,840 letters weighing one ounce each, would that be a long ton of mail? Yes, exactly. That is 35,840 first-class letters, which at current US postage rates would cost over 24,000 dollars to mail. The postal service would probably have some questions about your correspondence volume, and your mail carrier would definitely need a larger truck. ### Could I lift one ounce of a long ton and claim I lifted a long ton? You would be lifting 1/35,840th of a long ton, which is technically a fraction of a long ton but not a claim anyone would take seriously. 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