Square Millimeters to Square Kilometers Converter
Convert square millimeters (mm²) to square kilometers (km²), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter an area, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 mm² = 1e-12 km²
- 1 × 1e-12 = 1e-12 km²
How to convert square millimeters to square kilometers
1 mm² = 1 × 10⁻¹² km², so multiply by 1 to go from square millimeters to square kilometers. Going the other way, 1 km² = 1,000,000,000,000 mm².
km² = mm² × 1 mm² = km² × 1,000,000,000,000
Worked example:
1 mm² = 1e-12 km² 5 × 1e-12 = 5e-12 km²
Square Millimeters to square kilometers table
| Square Millimeters | Square Kilometers |
|---|---|
| 1 mm² | 1 × 10⁻¹² km² |
| 2 mm² | 2 × 10⁻¹² km² |
| 3 mm² | 3 × 10⁻¹² km² |
| 4 mm² | 4 × 10⁻¹² km² |
| 5 mm² | 5 × 10⁻¹² km² |
| 6 mm² | 6 × 10⁻¹² km² |
| 7 mm² | 7 × 10⁻¹² km² |
| 8 mm² | 8 × 10⁻¹² km² |
| 9 mm² | 9 × 10⁻¹² km² |
| 10 mm² | 1 × 10⁻¹¹ km² |
| 15 mm² | 1.5 × 10⁻¹¹ km² |
| 20 mm² | 2 × 10⁻¹¹ km² |
| 25 mm² | 2.5 × 10⁻¹¹ km² |
| 30 mm² | 3 × 10⁻¹¹ km² |
| 40 mm² | 4 × 10⁻¹¹ km² |
| 50 mm² | 5 × 10⁻¹¹ km² |
| 75 mm² | 7.5 × 10⁻¹¹ km² |
| 100 mm² | 1 × 10⁻¹⁰ km² |
| 250 mm² | 2.5 × 10⁻¹⁰ km² |
| 500 mm² | 5 × 10⁻¹⁰ km² |
| 1000 mm² | 1 × 10⁻⁹ km² |
About the units
- Square Millimeters (mm²)
- Square millimeters, a metric unit. Definition: BIPM SI Brochure (SI prefixes).
- Square Kilometers (km²)
- Square kilometers, a metric unit. Definition: BIPM SI Brochure (SI prefixes).
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