Ton (Long) To Kilogram Converter

1. Keep the direction on Long tons to kilograms, or flip it to turn kilograms into imperial tons.
2. Enter the long tons from a British, Irish, Australian or other Commonwealth source, such as an old ledger or a ship record.
3. Read the kilograms. The cards also give tonnes, the pounds, hundredweight and stone, and how much heavier the load is than the same count of tonnes.

A long ton is a British imperial unit of mass equal to 2,240 pounds, or exactly 1,016.0469088 kg. It is also called the imperial ton, the gross ton or the UK ton.

It sits at the top of the imperial mass ladder. Fourteen pounds make a stone, 112 pounds make a hundredweight, and 20 hundredweight make a ton. So one long ton is 160 stone.

The UK Weights and Measures Act 1985 still defines the ton as 2,240 pounds. It lists the ton in Schedule 1, Part VI, among units that may not be used for trade except as supplementary indications. In practice, British trade and industry now use the metric tonne of 1,000 kg.

In the US, Handbook 44 calls the same unit the gross or long ton. Americans meet it mainly in older records and some shipping and commodity use, since their everyday ton is the 2,000 lb short ton.

You multiply the long tons by 1,016.0469088, which is 2,240 x 0.45359237.

1. Count the pounds in one long ton: 20 hundredweight x 112 lb = 2,240 lb.
2. Change pounds to kilograms with the exact pound: 2,240 x 0.45359237 = 1,016.0469088 kg.
3. Multiply by your tons. For 7 long tons: 7 x 1,016.0469088 = 7,112.3283616 kg.

The old tool on this page used 1,016.047, a rounded value. The difference is tiny, about 0.09 g per ton, but this version keeps the full exact factor.

Family history. A 1920s letter says a coal merchant delivered 3 tons. In Britain that is 3 long tons: 3 x 1,016.0469088 = 3,048.1407264 kg, or about 3.05 tonnes.

Heavy lift. An old crane plate reads 25 tons. 25 x 1,016.0469088 = 25,401.17272 kg. Read as tonnes, it would be 401 kg short, so check which ton the plate means before you compare it with a modern load chart.

Hundredweight order. A farm record lists 15 cwt of feed. Fifteen hundredweight is 0.75 long ton, so 0.75 x 1,016.0469088 = 762.0351816 kg. The stone to pounds converter handles the smaller imperial steps.

Reverse. A metric quote gives 5,000 kg. 5,000 / 1,016.0469088 = 4.92103 long tons, which is 5.5116 US short tons.

The factor is exact, so the checks below are about reading the source correctly.

Ton or Tonne

The spelling is one letter apart and the mass is only 1.6 percent apart, so this mix-up is easy to miss. A British document from before metrication almost always means the long ton. A modern one almost always means the tonne.

US or UK Origin

If the number came from the US, it is probably a 2,000 lb short ton. Using the long ton factor then adds 12 percent.

Mixed Imperial Figures

Records often give tons, hundredweight and pounds together, such as 2 tons 5 cwt 56 lb. Turn it all into tons first: 2 + 5/20 + 56/2,240 = 2.275 long tons.

Rounding

Rounding the factor to 1,016 kg drops about 0.005 percent. That is fine for history, but keep the full factor for engineering sums.

The long ton is the heaviest of the three, 16.05 kg above a tonne and 108.86 kg above a US short ton.

A long ton is exactly 1.12 short tons, and a short ton is 0.892857 long ton. For UK body-weight figures in stone, the kg to stone converter works the other way.

Reading British and Commonwealth Records

Coal, grain, iron and cargo figures in older UK, Irish, Indian and Australian sources are in long tons. Converting to kilograms lets you compare them with modern data.

Old Equipment and Structures

Cranes, hoists, bridges and rail wagons built to imperial standards may carry ratings in tons. Convert to kilograms before you set them against a modern metric load.

Study and Puzzles

School tasks on the imperial system often ask for tons, hundredweight and stone in metric units. The imperial card shows every step at once. The metric to imperial converter covers length and volume too.

All values are exact, from long tons x 1,016.0469088 kg, with tonnes as kg / 1,000 and short tons as long tons x 1.12.

1. Treating an Old British Ton as a Tonne

The error is only 16 kg per ton, so it looks harmless. Across 500 tons it is more than 8 tonnes.

2. Using the US Ton on UK Data

Multiplying by 907 instead of 1,016 makes every figure about 10.7 percent too light.

3. Using a 100 Lb Hundredweight

The British hundredweight is 112 lb. The US one is 100 lb. Mixing them skews any figure given in tons and cwt.

4. Confusing Mass Tons with Ship Tonnage

Gross register tonnage is a volume measure, not a mass. It cannot be converted to kilograms with this factor.

5. Dropping the Extra Imperial Parts

A record reading 4 tons 10 cwt is 4.5 long tons, not 4. Leave out the hundredweight and you lose 508 kg.

The long ton to kilogram step is exact, so only the 12-figure display rounds.

A UK long ton is exactly 1,016.0469088 kg. Most people round it to 1,016 kg.

Yes. Imperial ton, long ton, gross ton and UK ton are four names for the same 2,240 lb unit.

Yes, but only slightly. A long ton is 16.05 kg, or 1.6 percent, heavier than a 1,000 kg metric tonne.

There are 0.984207 long tons in 1,000 kg. So a tonne is just under one imperial ton.

Not for trade. UK law still defines the ton as 2,240 lb, but it may only appear as a supplementary figure next to the metric one.

A long ton holds exactly 160 stone, because 2,240 / 14 = 160. That is 1,016.0469088 kg, or 6.35029318 kg per stone.

Two long tons are 2,032.0938176 kg. That is about 2.03 tonnes or 4,480 lb.

The British ton is built from 20 hundredweight, and the British hundredweight is 112 lb. Twenty times 112 gives 2,240.

Divide by 1,000 and take off about 1.6 percent. For 8,000 kg, 8 minus 1.6 percent is about 7.87 long tons, and the exact answer is 7.8737.

No. Your long ton figures are converted inside the browser and are not uploaded. Saved results stay on this device only.

• Legal definitions of the ton (2,240 lb), hundredweight, stone, pound and tonne (UK Weights and Measures Act 1985, Schedule 1, legislation.gov.uk).
• Gross or long ton of 2,240 lb and its exact 1,016.046 908 8 kg value (NIST Handbook 44, 2026, Appendix C).
• Conversion factor for ton, long (2240 lb) to kilograms (NIST SP 811, Appendix B.8).
• The tonne (metric ton), t = 1,000 kg, accepted for use with the SI (NIST SP 330, Section 4).