Convert Gigatons to Megatons
Convert Gigatons (Gt) to Megatons (Mt) instantly and accurately.
Conversion Formula
Mt = Gt × 1000
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.
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
| Gigatons (Gt) | Megatons (Mt) |
|---|---|
| 1 Gt | 1000 Mt |
| 2 Gt | 2000 Mt |
| 5 Gt | 5000 Mt |
| 10 Gt | 10000 Mt |
| 25 Gt | 25000 Mt |
| 50 Gt | 50000 Mt |
| 100 Gt | 100000 Mt |