To compare the two measurements, we need to convert them to the same unit. 1 kilogram is equal to 1000 milligrams. Therefore, 2.7 kilograms is equal to 2.7 x 1000 = 2700 milligrams.

Since 2700 milligrams is greater than 1976 milligrams, 2.7 kilograms is greater than 1976 milligrams.