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Long Ton (imperial ton)

Also called: imperial ton, UK ton, gross ton

Definition: The long ton is a unit of mass equal to 2,240 pounds, which NIST lists as 1,016.047 kilograms; it is 12% heavier than the US short ton.

Updated October 31, 2026 · How we check facts

The long ton is the traditional British ton: 2,240 pounds, or 20 hundredweight of 112 lb. NIST's SP 811 lists it as 1,016.047 kg, and it is mostly historical today. The name distinguishes it from the short ton of 2,000 lb.

Formula

long tons = pounds ÷ 2,240
kilograms = long tons × 1,016.0469

Example

A weight of 6,720 lb is 6,720 ÷ 2,240 = 3 long tons. The same weight is 3.36 short tons (6,720 ÷ 2,000) and 6,720 × 0.45359237 ÷ 1,000 = 3.05 metric tons.

Common mistakes

Assuming "ton" always means 2,000 lb. A long ton is 240 lb more than a short ton, a gap of 12%. See how many pounds in a ton.

Calculate it

Free toolKg to Lbs ConverterKilograms to pounds and back, with lb + oz and stone.

Guides that explain it

Related terms

Short Ton (US ton)The short ton, or US ton, is a unit of mass equal to 2,000 pounds, which NIST lists as 907.1847 kilograms; it is the ordinary meaning of "ton" in the United States.Metric Ton (tonne)The metric ton, or tonne (symbol t), is a unit of mass equal to exactly 1,000 kilograms, which is about 2,204.62 pounds.Pound (lb)The pound is a unit of weight equal to 16 ounces; NIST lists the avoirdupois pound as 0.4535924 kilograms, or about 453.59 grams.Acre (ac)The acre is a US customary unit of area equal to exactly 43,560 square feet, 4,840 square yards or 160 square rods; NIST gives it as 4,046.8564224 square meters.Centimeter (cm)The centimeter is a metric unit of length equal to one hundredth of a meter (0.01 m); exactly 2.54 centimeters make one inch.Fluid Ounce (fl oz)A fluid ounce is a unit of volume; one US fluid ounce is 29.57353 milliliters, and 8 of them make a US cup. It is not the same as the ounce used to weigh things.Gram (g)The gram is a metric unit of mass equal to one thousandth of a kilogram, the SI base unit of mass; about 0.03527 ounces.Hectare (ha)The hectare is a metric unit of area equal to exactly 10,000 square meters, which is about 2.471 acres; it is accepted for use with the SI.

Sources

  1. NIST Guide to the SI (SP 811), Appendix B.8 — Factors for Units Listed Alphabetically