Carats Conversion

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The carat is a unit used to measure weight. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about carats.

Carat Conversion Calculators

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Carat Definition and Usage

The carat is a unit of mass/weight equal to 200 milligrams.[1]

A carat is sometimes also referred to as a metric carat. Carats can be abbreviated as ct, and are also sometimes abbreviated as CD. For example, 1 carat can be written as 1 ct or 1 CD.

Background and Origin

Historically, various regions and countries have had their own version of the carat for use in measuring gold. The carat was standardized as a unit of a measure in 1877 and originally was equal to 205 milligrams of mass. It was later redefined at a convention in 1907 as being equal to 200 milligrams.

Uses

The carat is widely used for measuring the weight of diamonds, gemstones, and pearls.

How Much is a Carat?

If you're here, then there's a good chance you might be wondering just how much is a carat? The chart below shows how much a carat is in other measures of weight.

Common carat values and equivalent imperial and metric weight measurements
carats tons pounds ounces metric tons kilograms grams milligrams long tons
1 ct 0.00000022046 t 0.000441 lb 0.007055 oz 0.0000002 t 0.0002 kg 0.2 g 200 mg 0.00000019684 lt
2 ct 0.00000044092 t 0.000882 lb 0.01411 oz 0.0000004 t 0.0004 kg 0.4 g 400 mg 0.00000039368 lt
3 ct 0.00000066139 t 0.001323 lb 0.021164 oz 0.0000006 t 0.0006 kg 0.6 g 600 mg 0.00000059052 lt
4 ct 0.00000088185 t 0.001764 lb 0.028219 oz 0.0000008 t 0.0008 kg 0.8 g 800 mg 0.00000078737 lt
5 ct 0.0000011023 t 0.002205 lb 0.035274 oz 0.000001 t 0.001 kg 1 g 1,000 mg 0.00000098421 lt
6 ct 0.0000013228 t 0.002646 lb 0.042329 oz 0.0000012 t 0.0012 kg 1.2 g 1,200 mg 0.000001181 lt
7 ct 0.0000015432 t 0.003086 lb 0.049384 oz 0.0000014 t 0.0014 kg 1.4 g 1,400 mg 0.0000013779 lt
8 ct 0.0000017637 t 0.003527 lb 0.056438 oz 0.0000016 t 0.0016 kg 1.6 g 1,600 mg 0.0000015747 lt
9 ct 0.0000019842 t 0.003968 lb 0.063493 oz 0.0000018 t 0.0018 kg 1.8 g 1,800 mg 0.0000017716 lt
10 ct 0.0000022046 t 0.004409 lb 0.070548 oz 0.000002 t 0.002 kg 2 g 2,000 mg 0.0000019684 lt
11 ct 0.0000024251 t 0.00485 lb 0.077603 oz 0.0000022 t 0.0022 kg 2.2 g 2,200 mg 0.0000021653 lt
12 ct 0.0000026455 t 0.005291 lb 0.084658 oz 0.0000024 t 0.0024 kg 2.4 g 2,400 mg 0.0000023621 lt
13 ct 0.000002866 t 0.005732 lb 0.091712 oz 0.0000026 t 0.0026 kg 2.6 g 2,600 mg 0.0000025589 lt
14 ct 0.0000030865 t 0.006173 lb 0.098767 oz 0.0000028 t 0.0028 kg 2.8 g 2,800 mg 0.0000027558 lt
15 ct 0.0000033069 t 0.006614 lb 0.105822 oz 0.000003 t 0.003 kg 3 g 3,000 mg 0.0000029526 lt
16 ct 0.0000035274 t 0.007055 lb 0.112877 oz 0.0000032 t 0.0032 kg 3.2 g 3,200 mg 0.0000031495 lt
17 ct 0.0000037479 t 0.007496 lb 0.119931 oz 0.0000034 t 0.0034 kg 3.4 g 3,400 mg 0.0000033463 lt
18 ct 0.0000039683 t 0.007937 lb 0.126986 oz 0.0000036 t 0.0036 kg 3.6 g 3,600 mg 0.0000035431 lt
19 ct 0.0000041888 t 0.008378 lb 0.134041 oz 0.0000038 t 0.0038 kg 3.8 g 3,800 mg 0.00000374 lt
20 ct 0.0000044092 t 0.008818 lb 0.141096 oz 0.000004 t 0.004 kg 4 g 4,000 mg 0.0000039368 lt

References

  1. National Institute of Standards and Technology, Precious Metals Conversion Information, https://www.nist.gov/pml/owm/laws-and-regulations/precious-metals-conversion

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