How to convert km² to m²
m² = km² × 1,000,000. The scale factor is the source-unit factor divided by the destination-unit factor.
Worked example
For a floor or land surface area of 100 km² converts to 100,000,000 m².
- Start with 100 km².
- Multiply 100 by 1,000,000.
- Report 100,000,000 m², rounded to the precision of your original measurement.
Check the reverse conversion
1 m² = 0.000001 km². Use the square meter to square kilometer converter to calculate in the opposite direction. This has its own formula and reference table.
Definitions that matter
One square foot is 0.09290304 square meters. Do not convert square feet using the linear foot-to-meter factor. An acre describes area, not the length or shape of a boundary.
The base unit for this category is m². One km² corresponds to 1,000,000 sqm; one m² corresponds to 1 sqm. These definitions explain the relationship rather than relying on a rounded display value.
Sources and precision
Definitions: NIST Guide to the SI. Calculations use double precision; the tool defaults to a readable rounded result, while tables show up to ten significant digits. Displaying more digits does not increase the accuracy of the original measurement.
Read our calculation methodology and content standards, or continue with metric and customary measurement conventions.