Just multiply the kilograms by 1000. The prefix "kilo" means 1000.
2000 grams is equal to 2 kilograms.
62.1 kg is 62100 grams
3.5 kg is equal to 3500 grams.
0.025 kg
700 Grams
40,000 grams
3700 grams
23,000 grams
12,520 grams
721,000 grams
644,000 grams
5250 grams