Convert Pennyweights to Megatons
Convert Pennyweights (dwt) to Megatons (Mt) instantly and accurately.
Conversion Formula
Mt = dwt × 1.555173840e-12
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 Megatons
A megaton (Mt) equals one million metric tonnes (10⁹ kg). Nuclear weapon yields are measured in megatons of TNT equivalent: the largest weapon ever detonated, the Soviet Tsar Bomba tested in 1961, had a yield of approximately 50 Mt TNT and produced a fireball 8 km in diameter. Annual global CO₂ emissions are reported in gigatons (Gt), but regional emissions data and specific industrial sectors are quoted in megatons. The Chicxulub asteroid impact that caused the Cretaceous-Paleogene mass extinction released energy equivalent to roughly 100 million Mt of TNT.
Quick Reference Table
| Pennyweights (dwt) | Megatons (Mt) |
|---|---|
| 1 dwt | 1.555 × 10-12 Mt |
| 2 dwt | 3.11 × 10-12 Mt |
| 5 dwt | 7.776 × 10-12 Mt |
| 10 dwt | 1.555 × 10-11 Mt |
| 25 dwt | 3.888 × 10-11 Mt |
| 50 dwt | 7.776 × 10-11 Mt |
| 100 dwt | 1.555 × 10-10 Mt |