Carats to Milligrams

Carat

A carat (ct) is a specialized metric unit used to measure gemstones and pearls. One carat equals 200 milligrams — or 0.2 grams — making it perfectly sized for tiny but valuable items. Jewelers and gemologists rely on carats because small weight differences can significantly affect a stone’s price and quality.

Carats provide precision without using long decimal values in grams or milligrams. However, when converting gemstone weights to more common units, exact conversion factors are necessary — and this is where a converter becomes helpful.

Milligram

A milligram (mg) is a very small metric unit of mass equal to one-thousandth of a gram. It is commonly used in medicine, nutrition, and science to measure tiny quantities where precision is crucial. Vitamins, pharmaceuticals, and food additives often list dosage amounts in milligrams because even a small difference can matter.

Milligrams help prevent rounding errors when grams would be too large of a unit. While metric conversions are simple — 1,000 milligrams in a gram — switching to ounces or pounds requires careful calculation, making a converter especially useful.