Meters
you would measure a wall in meters
Kilometers
meters
Meters.
meters
Meters
Neither. By centimeters
Usually, you would use kilometers.
milimeters
if you are talking about how tall you are, meters would be the best choice. for instance if you are 2 meters tall (6ft give or take a bit) that would be like .002 kilometers
A football would be measured in cm. A raisin would be measured in mm A house would be measured in m
Considering km is kilometers, a measure of distance and grams are a measure of weight, this would be difficult to answer. Did you mean kilometers to meters?