How to convert carats to grams
To convert a measurement in carats to grams, multiply the value by 0.2. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 ct to grams: 5 × 0.2 = 1 g.
What is a carat?
A carat is a unit of mass for gemstones equal to exactly 200 milligrams (0.2 grams). The carat takes its name from the carob seed, once used as a counterweight for weighing gems. The metric carat of exactly 200 mg was adopted internationally in the early 20th century to standardize the gem trade.
Common uses of carats include: Diamond and gemstone weight; Jewelry pricing and grading; Pearl and precious stone trading; Gemological certification.
What is a gram?
A gram is a metric unit of mass equal to one thousandth of a kilogram (0.001 kg) or about 0.035 ounces. Defined in 1795 as the mass of one cubic centimeter of water at the temperature of melting ice. The gram is the base for many everyday metric masses and the reference point for nutritional labeling worldwide.
Common uses of grams include: Cooking and recipe ingredient quantities; Nutrition labels and food portions; Postage and small parcel weight; Jewelry and precious metal weighing.
Carats to grams worked examples
Here are some common values converted:
1 ct = 0.2 g 5 ct = 1 g 10 ct = 2 g 50 ct = 10 g 100 ct = 20 g
Frequently asked questions
How many grams are in one carat?
One carat (ct) equals 0.2 grams (g). Multiply any value in carats by 0.2 to convert to grams.
How do I convert carats to grams?
Multiply the value in carats by 0.2. For example, 5 ct × 0.2 = 1 g.
How do I convert grams to carats?
Multiply the value in grams by 5, or divide by 0.2. Use the swap button on the converter above to reverse the direction.
Is the carat to gram conversion exact?
Yes. Since 1959 the international pound is defined as exactly 0.45359237 kg, so all weight conversions between metric and avoirdupois units use exact factors.
What is the formula for carats to grams?
The formula is: g = ct × 0.2. This comes from the definition of both units relative to the kilogram.