Kilogram (kg) is the base unit of mass in the International System of Units (SI), widely used in daily life and scientific research. Gram (g) is 1/1000 of a kilogram and is commonly used to measure the mass of smaller objects. Milligram (mg) is 1/1000 of a gram, typically used to measure the mass of very small objects, such as medications. Ton (ton) is a larger unit of mass, often used for heavy objects or transportation. Pound (lb) is one of the Imperial units, commonly used in daily life in the UK and the US, especially for body weight. Ounce (oz) is another Imperial unit, commonly used for small objects' mass, such as food and jewelry. Stone (stone) is a unit of mass commonly used in the UK, where 1 stone equals 14 pounds. Long ton (long ton) is the Imperial ton, where 1 long ton equals 2240 pounds. Short ton (short ton) is the US ton, where 1 short ton equals 2000 pounds. Carat (carat) is a unit of mass used in the jewelry industry, where 1 carat equals 0.2 grams. Drachm (drachm) is an ancient unit of mass, approximately equal to 1/16 ounce. Scruple (scruple) is an ancient Greek medicinal weight unit, where 1 scruple equals 1/24 ounce. Metric ton (metric ton) is the mass unit in the International System, where 1 metric ton equals 1000 kilograms. Quintal (quintal) is 1/10 of a metric ton and is commonly used in agriculture, especially in grain production and trade. Poundal (poundal) is an Imperial unit of force, where 1 poundal equals 0.1382 kilograms. Long hundredweight (long hundredweight) is an Imperial unit, where 1 long hundredweight equals 112 pounds. Short hundredweight (short hundredweight) is a US unit, where 1 short hundredweight equals 100 pounds. Grain (grain) is the smallest unit of mass, where 1 grain equals approximately 64.798 milligrams. Carat (carat, metric) is a unit commonly used in the gemstone and jewelry industry, where 1 carat equals 0.2 grams.