About the km² to m² calculation
One square kilometer is exactly 1,000,000 square meters, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The usual scale for reporting the area of cities and regions. The standard unit for floor area in metric countries.
Formula
m² = km² × 1,000,000
1 km² = 1,000,000 m²
1 m² = 0.000001 km²Worked example
To convert 1 km², multiply by 1,000,000: 1 × 1,000,000 = 1,000,000 m².
Frequently asked questions
How many square meters are in a square kilometer?
There are 1,000,000 square meters in one square kilometer. To convert any amount, multiply the number of square kilometers by 1,000,000.
How do I convert square meters back to square kilometers?
Divide instead of multiplying, or equivalently multiply by 0.000001. One square meter is 0.000001 square kilometers.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between square kilometers and square meters 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 Kilometers: the usual scale for reporting the area of cities and regions. Square Meters: the standard unit for floor area in metric countries.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units