Convert Pennyweight (pwt) to Megagram (Mg) instantly.
About these units
Pennyweight (pwt)
The pennyweight, equal to 1/20 of a troy ounce or 1.55517384 grams, is a unit used primarily in the precious metals and jewelry industries. Its origins lie in medieval English coinage, when the weight of silver pennies provided a practical standard for small masses. Jewelers continue to use the pennyweight because many traditional pricing structures and metalworking conventions are built around troy-based subdivisions. For gold, silver, and dental alloys, the pennyweight remains easier to work with than grams due to long-established norms. Even though the metric system is now dominant scientifically, the pennyweight persists because industries tied to history—especially those involving money and precious goods—tend to maintain deeply rooted practices.
Megagram (Mg)
A megagram, equal to 1,000 kilograms, is identical in quantity to the metric ton (tonne). While "tonne" is common in daily life, Mg is preferred in engineering, environmental science, and formal scientific writing because it is unambiguous and adheres strictly to SI conventions. Megagrams are used to express masses of vehicles, construction materials, waste output, or agricultural yields in large-scale analyses. The unit is especially useful in Earth sciences, where megagram quantities describe biomass, sediment transport, or volcanic emissions.