Convert Nanogram (ng) to Pennyweight (pwt) instantly.
About these units
Nanogram (ng)
A nanogram equals 10⁻⁹ grams and is widely used across chemistry, toxicology, pharmaceuticals, and material science. Quantities such as trace contaminants, allergens, pesticides, or drug residues often fall in the nanogram range. In medicine, nanogram-per-liter concentrations are standard in blood tests, especially for cardiac markers like troponin, where even tiny amounts can indicate severe physiological conditions. Nanogram quantities are also important in environmental regulation and forensic science. The nanogram unit illustrates the power of modern analytical tools that can detect vanishingly small quantities with profound real-world implications.
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.