Square Meters to Square Kilometers
An instant square meters-to-square kilometers converter, with the formula and a reference table below.
| Square Meters | Square Kilometers |
|---|---|
| 1 m² | 1e-06 km² |
| 2 m² | 2e-06 km² |
| 3 m² | 3e-06 km² |
| 5 m² | 5e-06 km² |
| 10 m² | 1e-05 km² |
| 25 m² | 2.5e-05 km² |
| 50 m² | 5e-05 km² |
| 100 m² | 0.0001 km² |
How to use
- Enter a value in the Square Meters field.
- The Square Kilometers figure appears immediately — no button to press.
- Typing in the Square Kilometers field converts back to Square Meters the same way.
- Use the reference table for the values that come up most often.
Square Meters to Square Kilometers formula
The factor from square meters to square kilometers is 1e-06.
km² = m² × 1e-06
Why this factor: the square meter and the square kilometer are both defined against the square meter, so dividing one definition by the other gives 1e-06 directly. Both definitions are set out in full below.
To go the other way, divide by 1e-06 — or use the Square Kilometers to Square Meters converter, which is the same calculation reversed.
Worked example
Given 250 m², multiplying by 1e-06 yields 0.00025 km².
250 m² × 1e-06 = 0.00025 km²
The converter above does this for any value you type, in either direction.
What is a square meter?
The square meter is the SI unit of area — the surface of a one-meter square.
Definition: Derived directly from the meter.
Where it is used: Floor area in property listings, land plots, and material coverage worldwide outside the US.
What is a square kilometer?
A square kilometer is the area of a one-kilometer square — one million square meters.
Definition: Exactly 1×10⁶ square meters. Note it is the kilometer that is squared, not the prefix applied to a square meter.
Where it is used: City, national park and country areas, population density, and land cover statistics.
Square Meters vs Square Kilometers
The square meter is an SI unit while the square 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 square kilometers are in a square meter?
One square meter equals 1e-06 square kilometers.
What is the formula to convert square meters to square kilometers?
Multiply the number of square meters by 1e-06. To reverse it, divide by 1e-06 instead.
How do I convert square kilometers back to square meters?
Divide by 1e-06, which is the same as multiplying by 1000000.
How many square kilometers are in 10 square meters?
10 m² works out to 1e-05 km².
How is the square meter defined?
Derived directly from the meter.