Square millimetres to Square kilometres Converter
Convert square millimetres (mm²) to square kilometres (km²) instantly. Area conversions are everyday maths in Singapore property: HDB flats are listed in square metres while condo listings and PSF prices use square feet.
Result
- Square kilometres
- 1.000000e-12 km²
How to use the square millimetres to square kilometres converter
- Enter the square millimetres (mm²).
- The results update as you type, or press Calculate.
- Read the square kilometres first, then the supporting figures below it.
Formula
Square kilometres = square millimetres × 1.000000e-12
Worked example
For example, with these inputs:
- Square millimetres (mm²): 1
the calculator returns:
- Square kilometres: 1.000000e-12 km²
Square millimetres to Square kilometres table
| Square millimetres | Square kilometres |
|---|---|
| 1 mm² | 1.000000e-12 km² |
| 2 mm² | 2.000000e-12 km² |
| 5 mm² | 5.000000e-12 km² |
| 10 mm² | 1.000000e-11 km² |
| 20 mm² | 2.000000e-11 km² |
| 25 mm² | 2.500000e-11 km² |
| 50 mm² | 5.000000e-11 km² |
| 100 mm² | 1.000000e-10 km² |
| 250 mm² | 2.500000e-10 km² |
| 500 mm² | 5.000000e-10 km² |
| 1,000 mm² | 1.000000e-9 km² |
About this conversion
Area conversions are everyday maths in Singapore property: HDB flats are listed in square metres while condo listings and PSF prices use square feet.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Frequently asked questions
How many square kilometres are in one square millimetre?
1 mm² = 1.000000e-12 km².
How do I convert mm² to km²?
Square kilometres = square millimetres × 1.000000e-12.