Convert Megatons to Grains
Convert Megatons (Mt) to Grains (gr) instantly and accurately.
Conversion Formula
gr = Mt × 15432358350000
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.
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.
Quick Reference Table
| Megatons (Mt) | Grains (gr) |
|---|---|
| 1 Mt | 1.543 × 1013 gr |
| 2 Mt | 3.086 × 1013 gr |
| 5 Mt | 7.716 × 1013 gr |
| 10 Mt | 1.543 × 1014 gr |
| 25 Mt | 3.858 × 1014 gr |
| 50 Mt | 7.716 × 1014 gr |
| 100 Mt | 1.543 × 1015 gr |