How many carats are in one long ton?

One long ton contains approximately 5,080,234 carats. This is calculated from 1 long ton being 1,016.047 kilograms and 1 kilogram equaling 5,000 carats.

What is the difference between a long ton and a metric ton?

A long ton is 2,240 pounds (1,016.05 kg), used historically in British Commonwealth countries. A metric ton (tonne) is exactly 1,000 kg. The long ton is about 1.6% heavier than a metric ton.

Is the long ton still in use?

The long ton is largely obsolete, replaced by the metric tonne in most international trade. It still appears occasionally in British shipping records, US naval terminology (displacement tonnage), and some petroleum industry measurements.

Carats to Long Tons (ct to long tn) Converter

1 ct = 1.96841 × 10⁻⁷ long tn

1 Carat equals 1.96841 × 10⁻⁷ Long Tons (1 ct = 1.96841 × 10⁻⁷ long tn). Convert Carats to Long Tons with formula, table, and examples.

One carat equals approximately 1.968 x 10^-7 long tons. The long ton (also called the imperial ton) weighs 2,240 pounds or about 1,016.05 kilograms, making it roughly 5,080,234 carats. This is one of the most extreme weight conversions between gemological and industrial units - a single long ton of diamonds would represent a staggering fortune.

How to Convert Carats to Long Tons

long tn = ct × 1.96841 × 10⁻⁷

Multiply the value in Carats by 1.96841 × 10⁻⁷

Take your value in Carats
Multiply by 1.96841 × 10⁻⁷
Read the result in Long Tons

Common Carats to Long Tons Conversions

Carats (ct)	Long Tons (long tn)	Status
10,000 ct	0.0019684131 long tn
50,000 ct	0.0098420653 long tn
100,000 ct	0.0196841306 long tn
500,000 ct	0.0984206528 long tn
1,000,000 ct	0.1968413055 long tn
2,500,000 ct	0.4921032638 long tn
5,000,000 ct	0.9842065276 long tn
10,000,000 ct	1.9684130552 long tn
25,000,000 ct	4.9210326381 long tn
50,000,000 ct	9.8420652761 long tn

Good to Know About Carats to Long Tons Conversion

The long ton originated in medieval English commerce as 20 long hundredweights (20 x 112 = 2,240 pounds). Its name derives from the Old English 'tunne,' a large cask used for shipping wine. The irony of converting this bulk cargo unit to the carat - a unit born from individual carob seeds - captures the full range of human measurement, from the heaviest industrial loads to the lightest precious objects.

Carats to Long Tons: What You Need to Know

Global annual diamond production is roughly 130 million carats, which equals only about 25.6 long tons of physical weight. A single long ton of gem-quality diamonds would be worth tens of billions of dollars. The long ton was traditionally used for British coal, iron, and shipping cargo - bulk materials that are the polar opposite of precious gemstones in both density of value and method of handling.

What is a Carat? ct

A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used for measuring gemstones and pearls. Adopted internationally in 1907 by the Fourth General Conference on Weights and Measures.

Metric diamond weight gemstone grading pearl measurement

Learn more about Carat →

What is a 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.

Imperial UK shipping naval displacement Commonwealth trade

Learn more about Long Ton →

Going the other way? Use our Long Tons to Carats converter.

Carats to Long Tons FAQ

One long ton contains approximately 5,080,234 carats. This is calculated from 1 long ton being 1,016.047 kilograms and 1 kilogram equaling 5,000 carats.
A long ton is 2,240 pounds (1,016.05 kg), used historically in British Commonwealth countries. A metric ton (tonne) is exactly 1,000 kg. The long ton is about 1.6% heavier than a metric ton.
The long ton is largely obsolete, replaced by the metric tonne in most international trade. It still appears occasionally in British shipping records, US naval terminology (displacement tonnage), and some petroleum industry measurements.

Non-Frequently Asked Questions About Carats to Long Tons

Questions nobody should ask - but someone did.

A long ton of diamonds (over 5 million carats) would weigh 1,016 kg and occupy roughly 288 liters - about the size of a large bathtub. Dropping it would create a spectacular shower of gems, a very expensive cleanup job, and an insurance claim that would make underwriters weep.
A typical cargo ship displaces about 50,000 long tons. Converting that to diamonds gives about 254 billion carats, which is roughly 2,000 years of global diamond production. The ship could physically carry the weight, but assembling that many diamonds is another matter entirely.
They weigh exactly the same - 2,240 pounds each. But the diamonds would fit in a large bathtub while the feathers would fill several rooms. This is the classic trick question, and the answer is always the same regardless of which material you choose.