Convert Gram (g) to Grain (gr) instantly.
About these units
Gram (g)
The gram is one-thousandth of a kilogram and is widely used in everyday life for measuring food, medicines, small components, and scientific samples. Its scale is convenient for objects too light to measure in kilograms yet too heavy for milligrams. Chemists, biologists, and lab technicians rely heavily on grams to quantify reagents, biological specimens, powders, and liquids. The gram appears frequently in nutrition labels, recipes, and manufacturing specifications. As a metric unit, the gram benefits from simplicity and ease of conversion—just move the decimal to reach milligrams or kilograms. Its intuitive scale makes it one of the most universally recognized units in the world.
Grain (gr)
The grain, defined as exactly 64.79891 milligrams, is one of the oldest units of mass still in limited use today. Derived from the weight of average cereal grains such as barley or wheat, it became a universal tiny unit used across Europe for coins, medicine, and gunpowder. The grain persists in firearms and ammunition manufacturing because bullet weights are still listed in grains (e.g., a "150-grain bullet"). Reloaders and ballistic engineers rely on the grain as a fine unit suitable for measuring powder charges and projectile masses. It is also used in traditional gold and silver transactions, linking it to the troy system. The grain's longevity highlights how ancient agrarian measures can remain embedded in modern technological practices.