How to convert milligrams to carats
To convert a measurement in milligrams to carats, multiply the value by 0.005. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 mg to carats: 5 × 0.005 = 0.025 ct.
What is a milligram?
A milligram is a metric unit of mass equal to one thousandth of a gram (0.001 g) or one millionth of a kilogram. Part of the original metric system, the milligram derives from the Latin 'mille' (thousand). It became indispensable in pharmacy and medicine, where drug doses are almost always expressed in milligrams.
Common uses of milligrams include: Medication and supplement dosages; Nutrient amounts on nutrition labels (sodium, vitamins); Laboratory chemistry and analytical work; Gunpowder and reloading measurements.
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.
Milligrams to carats worked examples
Here are some common values converted:
1 mg = 0.005 ct 5 mg = 0.025 ct 10 mg = 0.05 ct 50 mg = 0.25 ct 100 mg = 0.5 ct
Frequently asked questions
How many carats are in one milligram?
One milligram (mg) equals 0.005 carats (ct). Multiply any value in milligrams by 0.005 to convert to carats.
How do I convert milligrams to carats?
Multiply the value in milligrams by 0.005. For example, 5 mg × 0.005 = 0.025 ct.
How do I convert carats to milligrams?
Multiply the value in carats by 200, or divide by 0.005. Use the swap button on the converter above to reverse the direction.
Is the milligram to carat 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 milligrams to carats?
The formula is: ct = mg × 0.005. This comes from the definition of both units relative to the kilogram.