Neither of these units are mass so none. If you meant milligram and kilogram, then a milligram is smaller. In fact it is 1 million times smaller.
From largest to smallest, kilometers, meters,decimeters, centimeters, millimeters, micrometers, nanometers, picometers.
There are 14,000,000 millimeters in 14 kilometers.
250 millimeters=0.00025 kilometers
Converting from millimeters to kilometers, 10,000 millimeters is 0.01 kilometers. Millimeters and kilometers are part of the metric system.
3 kilometers = 3,000,000 millimeters
78,000 millimeters = 0.078 kilometers
318 kilometers = 318,000,000 millimeters
4.5 kilometers is 4,500,000 millimeters.
32 kilometers = 32000000 millimeters
There are 0.000196 kilometers in 19.6 millimeters.
There are 0.003555 kilometers in 3555 millimeters.
0.0516 kilometers=51,600 millimeters