Meters to Kilometers
Type a value in either box to convert between meters and kilometers. The factor is 0.001.
| Meters | Kilometers |
|---|---|
| 1 m | 0.001 km |
| 2 m | 0.002 km |
| 3 m | 0.003 km |
| 5 m | 0.005 km |
| 10 m | 0.01 km |
| 25 m | 0.025 km |
| 50 m | 0.05 km |
| 100 m | 0.1 km |
How to use
- Enter a value in the Meters field.
- The Kilometers figure appears immediately — no button to press.
- Typing in the Kilometers field converts back to Meters the same way.
- Use the reference table for the values that come up most often.
Meters to Kilometers formula
Converting meters to kilometers is a single multiplication by 0.001.
km = m × 0.001
Put another way, one meter is exactly 1/1,000 of a kilometer.
Why this factor: the meter and the kilometer are both defined against the meter, so dividing one definition by the other gives 0.001 directly. Both definitions are set out in full below.
To go the other way, divide by 0.001 — or use the Kilometers to Meters converter, which is the same calculation reversed.
Worked example
Start with 100 m. Multiply by 0.001 to get 0.1 km.
100 m × 0.001 = 0.1 km
The converter above does this for any value you type, in either direction.
What is a meter?
The meter is the SI base unit of length — the reference every other length unit is now defined against.
Definition: Since 1983 the meter has been defined by fixing the speed of light in vacuum at exactly 299,792,458 meters per second, so a meter is the distance light travels in 1/299,792,458 of a second.
Where it is used: Universal in science, engineering and everyday measurement everywhere except the United States.
What is a kilometer?
A kilometer is 1,000 meters, the standard unit for road distances and geography in most of the world.
Definition: Exactly 1,000 meters by SI prefix definition — 'kilo' means 10³.
Where it is used: Road signs, running and cycling distances, and map scales outside the US and UK.
Meters vs Kilometers
The meter is an SI unit while the kilometer is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many kilometers are in a meter?
One meter equals 0.001 kilometers.
What is the formula to convert meters to kilometers?
Multiply the number of meters by 0.001. To reverse it, divide by 0.001 instead.
How do I convert kilometers back to meters?
Divide by 0.001, which is the same as multiplying by 1000.
How many kilometers are in 10 meters?
10 m works out to 0.01 km.
How is the meter defined?
Since 1983 the meter has been defined by fixing the speed of light in vacuum at exactly 299,792,458 meters per second, so a meter is the distance light travels in 1/299,792,458 of a second.