Convert Grain (gr) to Metric Ton (t) instantly.
About these units
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.
Metric Ton (t)
The metric ton, or tonne, equals 1,000 kilograms and is used for measuring large masses such as vehicles, industrial shipments, agricultural yields, waste disposal, and construction materials. Its convenient decimal relationship with kilograms makes it easy to use in logistics, industry, and environmental studies. Many countries express carbon emissions in tonnes of CO₂, linking the unit directly to global sustainability efforts. The metric ton contrasts with the US short ton and UK long ton—its exact definition prevents ambiguity in international trade. Its adoption worldwide demonstrates the advantages of standardized mass units in a global economy.