Carats to Long Tons (ct to LT) Converter

How to convert carats to long tons

FormulaLT = ct × 1.968413055×10⁻⁷

Multiply the value in carats by 1.968413055×10⁻⁷. To go the other way, multiply by 5,080,234.544 (or divide by 1.968413055×10⁻⁷).

A carat is smaller than an imperial ton: it takes 5,080,234.544 carats to make one imperial ton.

Worked examples

1 carat1 ct × 1.968413055×10⁻⁷ = 1.968413055×10⁻⁷ LT
5 carats5 ct × 1.968413055×10⁻⁷ = 9.842065276×10⁻⁷ LT
10 carats10 ct × 1.968413055×10⁻⁷ = 0.000001968413055 LT
20 carats20 ct × 1.968413055×10⁻⁷ = 0.00000393682611 LT
100 carats100 ct × 1.968413055×10⁻⁷ = 0.00001968413055 LT

Carats to long tons conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Carats to long tons: 0.1–10 ct
Carats (ct)	Long tons (LT)
0.1 ct	1.9684131×10⁻⁸ LT
0.25 ct	4.9210326×10⁻⁸ LT
0.5 ct	9.8420653×10⁻⁸ LT
1 ct	1.9684131×10⁻⁷ LT
2 ct	3.9368261×10⁻⁷ LT
3 ct	5.9052392×10⁻⁷ LT
4 ct	7.8736522×10⁻⁷ LT
5 ct	9.8420653×10⁻⁷ LT
6 ct	0.0000011810478 LT
7 ct	0.0000013778891 LT
8 ct	0.0000015747304 LT
9 ct	0.0000017715717 LT
10 ct	0.0000019684131 LT

Carats to long tons: 12–1,000 ct
Carats (ct)	Long tons (LT)
12 ct	0.0000023620957 LT
15 ct	0.0000029526196 LT
20 ct	0.0000039368261 LT
25 ct	0.0000049210326 LT
30 ct	0.0000059052392 LT
40 ct	0.0000078736522 LT
50 ct	0.0000098420653 LT
75 ct	0.000014763098 LT
100 ct	0.000019684131 LT
250 ct	0.000049210326 LT
500 ct	0.000098420653 LT
1,000 ct	0.00019684131 LT

About the units

Carat (ct)

The metric carat is exactly 200 mg and is used to weigh gemstones. (Karat, a gold-purity scale, is a different thing.) One carat equals 0.0002 kilograms (kg).

Imperial ton (LT)

2,240 lb (1,016.0469088 kg), historically used in the UK. One imperial ton equals 1,016.046909 kilograms (kg).

Frequently asked questions

How many long tons are in one carat?

There are 1.968413055×10⁻⁷ long tons in one carat, and this value is exact by definition.

How do I convert carats to long tons?

Multiply the number of carats by 1.968413055×10⁻⁷. For example, 10 ct × 1.968413055×10⁻⁷ = 0.000001968413055 LT.

How many carats are in one imperial ton?

One imperial ton equals 5,080,234.544 carats. That is the reverse factor, 1 ÷ 1.968413055×10⁻⁷.

What is 10 carats in long tons?

10 ct = 0.000001968413055 LT.

Is this ct to LT converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.

Carats to Long Tons Converter