Convert square millimeters to square kilometers
1 mm² = 1.0000 × 10^-12 km². Change the amount below, or read the formula and the reference table further down.
1 square millimeter equals
square kilometers
1 mm² = 1.0000 × 10^-12 km²
The formula
Square millimeters and square kilometers both measure area from the same zero, so a single multiplier does the job.
km² = mm² × 1.0000 × 10^-12
Going the other way? Convert square kilometers to square millimeters.
Square millimeters to square kilometers table
Common values, rounded for reading.
| Square millimeters (mm²) | Square kilometers (km²) |
|---|---|
| 1 | 1.0000 × 10^-12 |
| 2 | 2.0000 × 10^-12 |
| 3 | 3.0000 × 10^-12 |
| 4 | 4.0000 × 10^-12 |
| 5 | 5.0000 × 10^-12 |
| 6 | 6.0000 × 10^-12 |
| 7 | 7.0000 × 10^-12 |
| 8 | 8.0000 × 10^-12 |
| 9 | 9.0000 × 10^-12 |
| 10 | 1.0000 × 10^-11 |
| 15 | 1.5000 × 10^-11 |
| 20 | 2.0000 × 10^-11 |
| 25 | 2.5000 × 10^-11 |
| 30 | 3.0000 × 10^-11 |
| 40 | 4.0000 × 10^-11 |
| 50 | 5.0000 × 10^-11 |
| 75 | 7.5000 × 10^-11 |
| 100 | 1.0000 × 10^-10 |
| 250 | 2.5000 × 10^-10 |
| 500 | 5.0000 × 10^-10 |
| 1,000 | 1.0000 × 10^-9 |
Questions people ask
- How many square kilometers are in a square millimeter?
- One square millimeter equals 1.0000 × 10^-12 square kilometers.
- How do I convert square millimeters to square kilometers by hand?
- Multiply the number of square millimeters by 1.0000 × 10^-12. For a rough check, 1.0000 × 10^-12 is close enough for most everyday use.
- What is 1 square millimeter in square kilometers?
- 1 square millimeter is 1.0000 × 10^-12 square kilometers.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.