Carat conversions

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The carat conversion selector above selects the mass/weight measurement unit to convert to starting from carats (ct). To make a conversion starting from a unit of mass other than carat, simply click on the "Reset" button.

What is carat?

The carat (or metric carat) is a unit of mass in the metric system, equal to 0.2x10-3 kilograms (1carat = 0.2x10-3 kg), the base unit of mass in the International System of Units (SI). It is also equal to 200 milligrams (mg) or 0.2 grams (g) (SI units of mass), or approximately 4.409245x10-4 pounds (lb) or 0.007055 ounces (oz), which are US customary / Imperial units of mass.

The term "carat" (plural: carats, symbol: ct) or "karat" (plural: karats, symbol: kt, US spelling) is also used as a unit of purity for gold alloy (the pure gold = 24-carats).

Over time various carats have been recorded, examples of which include:

  • The Romans and Greeks carat called "solidus", equal to about 189 milligrams (mg) or 0.189 grams (g)
  • The Egypt carat in the Byzantine period, equal to about 196 milligrams (mg) or 0.196 grams (g)
  • The Syrian carat in the First Millennium CE, equal to about 212 milligrams (mg) or 0.212 grams (g)

The carat is used in many countries around the world as a unit of mass for pearls and gemstones.

Symbol:

ct

Plural:

carats

Also called:

metric carat (plural: metric carats)