Convert Grains to Pennyweights
Convert Grains (gr) to Pennyweights (dwt) instantly and accurately.
Conversion Formula
dwt = gr × 0.04166666667
About Grains
A grain (gr) is the smallest unit in both the avoirdupois and troy weight systems, equal to exactly 64.79891 milligrams. Originally defined as the mass of a single grain of barley or wheat from the middle of an ear, it has been a standard of weight since ancient times. Today, grains are used to weigh gunpowder charges and bullets (a standard .308 rifle bullet weighs 168 gr), pharmaceutical preparations in apothecary compounding, and the fineness of gold alloys. Arrowhead and fishing hook weights are also specified in grains.
About Pennyweights
A pennyweight (dwt or pwt) equals 24 grains or 1/20 of a troy ounce - approximately 1.555 grams. Its name derives from the weight of an English silver penny in the medieval period. Pennyweights are the standard unit used by jewellers and goldsmiths in North America for weighing precious metals: gold, silver, and platinum. When a jeweller quotes the gold weight of a ring or chain, they typically use pennyweights. Gold buyers, refiners, and scrap metal dealers quote prices per pennyweight (often abbreviated 'DWT') when appraising jewellery.
Quick Reference Table
| Grains (gr) | Pennyweights (dwt) |
|---|---|
| 1 gr | 0.0416667 dwt |
| 2 gr | 0.0833333 dwt |
| 5 gr | 0.208333 dwt |
| 10 gr | 0.416667 dwt |
| 25 gr | 1.04167 dwt |
| 50 gr | 2.08333 dwt |
| 100 gr | 4.16667 dwt |