Convert Pennyweights to Gigatons
Convert Pennyweights (dwt) to Gigatons (Gt) instantly and accurately.
Conversion Formula
Gt = dwt × 1.555173840e-15
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.
About Gigatons
A gigaton (Gt) equals one billion metric tonnes (10¹² kg). It is the standard unit for planetary-scale mass measurements and global environmental budgets. Annual human CO₂ emissions are approximately 37 Gt CO₂; Earth's atmosphere contains roughly 5,480 Gt of air; Antarctic ice sheet mass is around 26,500,000 Gt of ice. Climate scientists report ice sheet mass balance changes in gigatons per year - the Greenland ice sheet loses approximately 280 Gt of ice annually due to climate change.
Quick Reference Table
| Pennyweights (dwt) | Gigatons (Gt) |
|---|---|
| 1 dwt | 1.555 × 10-15 Gt |
| 2 dwt | 3.11 × 10-15 Gt |
| 5 dwt | 7.776 × 10-15 Gt |
| 10 dwt | 1.555 × 10-14 Gt |
| 25 dwt | 3.888 × 10-14 Gt |
| 50 dwt | 7.776 × 10-14 Gt |
| 100 dwt | 1.555 × 10-13 Gt |