How to convert carats to kilograms
To convert a measurement in carats to kilograms, multiply the value by 0.0002. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 ct to kilograms: 5 × 0.0002 = 0.001 kg.
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 kilogram?
A kilogram is the SI base unit of mass, equal to 1,000 grams or approximately 2.205 pounds. Originally defined in 1795 as the mass of one liter of water, the kilogram was fixed by a platinum-iridium cylinder from 1889 until 2019, when it was redefined in terms of the Planck constant. It is the only SI base unit whose name carries a prefix.
Common uses of kilograms include: Body weight in most countries; Grocery and produce pricing (price per kg); Shipping and freight weight; Scientific and laboratory mass measurements.
Carats to kilograms worked examples
Here are some common values converted:
1 ct = 0.0002 kg 5 ct = 0.001 kg 10 ct = 0.002 kg 50 ct = 0.01 kg 100 ct = 0.02 kg
Frequently asked questions
How many kilograms are in one carat?
One carat (ct) equals 0.0002 kilograms (kg). Multiply any value in carats by 0.0002 to convert to kilograms.
How do I convert carats to kilograms?
Multiply the value in carats by 0.0002. For example, 5 ct × 0.0002 = 0.001 kg.
How do I convert kilograms to carats?
Multiply the value in kilograms by 5,000, or divide by 0.0002. Use the swap button on the converter above to reverse the direction.
Is the carat to kilogram 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 kilograms?
The formula is: kg = ct × 0.0002. This comes from the definition of both units relative to the kilogram.