About the m² to km² calculation
One square meter is exactly 0.000001 square kilometers, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The standard unit for floor area in metric countries. The usual scale for reporting the area of cities and regions.
Formula
km² = m² × 0.000001
1 m² = 0.000001 km²
1 km² = 1,000,000 m²Worked example
To convert 100 m², multiply by 0.000001: 100 × 0.000001 = 0.0001 km².
Frequently asked questions
How many square kilometers are in a square meter?
There are 0.000001 square kilometers in one square meter. To convert any amount, multiply the number of square meters by 0.000001.
How do I convert square kilometers back to square meters?
Divide instead of multiplying, or equivalently multiply by 1,000,000. One square kilometer is 1,000,000 square meters.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between square meters and square kilometers is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Square Meters: the standard unit for floor area in metric countries. Square Kilometers: the usual scale for reporting the area of cities and regions.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units