How to Convert Square metres to Square kilometres (m² to km²)
Area conversions are everyday maths in Singapore property: HDB flats are listed in square metres while condo listings and PSF prices use square feet. This guide shows how to convert square metres into square kilometres by hand, with examples and a quick-reference table.
The conversion
To convert square metres to square kilometres, multiply the value by 1.000000e-06. To go the other way, divide by the same number (or multiply by 1,000,000). Because the factor is tiny, scientific notation keeps the numbers manageable.
Square kilometres = square metres × 1.000000e-06
Worked examples
- 3 m² = 3.000000e-6 km²
- 12.5 m² = 1.250000e-5 km²
- 75 m² = 7.500000e-5 km²
Square metres to Square kilometres table
| Square metres | Square kilometres |
|---|---|
| 1 m² | 1.000000e-6 km² |
| 2 m² | 2.000000e-6 km² |
| 5 m² | 5.000000e-6 km² |
| 10 m² | 1.000000e-5 km² |
| 20 m² | 2.000000e-5 km² |
| 25 m² | 2.500000e-5 km² |
| 50 m² | 5.000000e-5 km² |
| 100 m² | 1.000000e-4 km² |
| 250 m² | 0.00025 km² |
| 500 m² | 0.0005 km² |
| 1,000 m² | 0.001 km² |
Common questions
Is m² to km² exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Square kilometres to Square metres converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Square metres to Square kilometres Converter or browse all area converters.
Run your own numbers: Square metres to Square kilometres Converter