Meters and kilometers are both SI units. A kilometer is exactly 1000 meters, so 1 meter = 0.001 kilometers. Converting is just moving the decimal three places (left for m → km, right for km → m). This page also supports conversion across all major length units with internal exact factors.
How many kilometers are in a meter?
0.001 km exactly.
How many meters are in a kilometer?
1000 m.
Why is the conversion exact?
Because kilo is the SI prefix for 1000.
When do I use scientific notation?
Useful when meter values exceed about 1,000,000 to keep numbers readable.
How do I reverse it?
Multiply km by 1000 to get meters.