Question: how many tons are in a gigaton?
Answer: 1 Gigatonne: 1 Gigatonne or metric gigaton (unit of mass) is equal to 1,000,000,000 metric tons. A metric ton is exactly 1000 kilograms (SI base unit) making a gigatonne equal to 1000000000000 kilograms. 1 Gt = 1000000000000 kg.