Carats to Stones

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.

Stone

A stone (st) is a unit of weight used primarily in the United Kingdom and Ireland, especially for measuring body weight. One stone equals 14 pounds, or roughly 6.35 kilograms. Because it provides a convenient number for typical human weights, stones remain popular in health, sports, and everyday conversations.

Although stones are not used in the metric system or the United States, conversions are often needed for travel, fitness tracking apps, or international communication. A converter helps provide a quick translation to pounds or kilograms.