How to Convert Square kilometres to Square metres (km² to m²)
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 kilometres into square metres by hand, with examples and a quick-reference table.
The conversion
To convert square kilometres to square metres, multiply the value by 1,000,000. To go the other way, divide by the same number (or multiply by 1.000000e-06). For a quick estimate, multiply by about 1,000,000.
Square metres = square kilometres × 1,000,000
Worked examples
- 3 km² = 3,000,000 m²
- 12.5 km² = 12,500,000 m²
- 75 km² = 75,000,000 m²
Square kilometres to Square metres table
| Square kilometres | Square metres |
|---|---|
| 1 km² | 1,000,000 m² |
| 2 km² | 2,000,000 m² |
| 5 km² | 5,000,000 m² |
| 10 km² | 10,000,000 m² |
| 20 km² | 20,000,000 m² |
| 25 km² | 25,000,000 m² |
| 50 km² | 50,000,000 m² |
| 100 km² | 100,000,000 m² |
| 250 km² | 250,000,000 m² |
| 500 km² | 500,000,000 m² |
| 1,000 km² | 1,000,000,000 m² |
Common questions
Is km² to m² 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 metres to Square kilometres converter.
Mistakes to avoid
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.
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.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
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.
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 kilometres to Square metres Converter or browse all area converters.
Run your own numbers: Square kilometres to Square metres Converter