Carats to Milligrams converter

To convert carats to milligrams, enter the value in the first field. The result in milligrams is calculated automatically using the exact conversion factor.

1 ct = 200 mg
1 mg = 0.005 ct

Formula: mg = ct × 200
ct = mg × 0.005

Definitions: 1 ct = 0.2 g; 1 mg = 0.001 g

The metric carat (ct) is exactly 200 milligrams and is the unit for weighing gemstones such as diamonds. It should not be confused with the karat, which measures the purity of gold.

The milligram (mg) is one thousandth of a gram. It is the standard unit for doses of medicines and supplements, and for nutrients such as sodium and caffeine on food labels.

See the conversion table with commonly used values, handy for quick reference or study.