Yes, there are 1000 metres in a Kilometer
100 meters = 0.1 killometers
You would use meters. Or, if the trail is more than 1000 meters, you can use killometers
0.065
104,000
3642000
1.2km
140
4.8 kilometers=4,800 meters
247 meters = 0.247 kilometers
You multiply kilometers by 1000.
6000 meters
It is 2000 meters which equals 2 kilometers