They don't, it's me. 100 000 tons = 100 000 thousand kilograms = 100 000 thousand thousand grams. You have three different ways to say "thousand" there, one ne

They don't, it's me. 100 000 tons = 100 000 thousand kilograms = 100 000 thousand thousand grams. You have three different ways to say "thousand" there, one nested. Which seems bit overcomplicated compared to Gg. The 100Gg is huge, 45Gg is WWII huge, 10Gg is interwar "treaty maximum". 4Gg is what USN currently regards "seaworthy", 2Gg is biggest things that sailed with sails and anything less than 1Gg is no longer ship but a "boat" in modern standards. Convenient?