Square centimeters to square kilometers
square kilometers = square centimeters × 1e-10
How to convert square centimeters to square kilometers
One square centimeter is 1e-10 square kilometers, so multiply the number of square centimeters by 1e-10. For example, 20 square centimeters is 20 × 1e-10 = 2e-9 square kilometers. To go back, divide by the same number, or multiply by 10,000,000,000.
Quick estimate
Multiplying by about 1e-10 gets within 0.0% of the exact answer, which is enough to check that a result makes sense.
Where it comes up
Area conversions come up when buying flooring, paint or turf, comparing house and flat sizes, and measuring land and gardens.
| square centimeters | square kilometers |
|---|---|
| 1 cm2 | 1e-10 km2 |
| 2 cm2 | 2e-10 km2 |
| 3 cm2 | 3e-10 km2 |
| 4 cm2 | 4e-10 km2 |
| 5 cm2 | 5e-10 km2 |
| 6 cm2 | 6e-10 km2 |
| 7 cm2 | 7e-10 km2 |
| 8 cm2 | 8e-10 km2 |
| 9 cm2 | 9e-10 km2 |
| 10 cm2 | 1e-9 km2 |
| 11 cm2 | 1.1e-9 km2 |
| 12 cm2 | 1.2e-9 km2 |
| 13 cm2 | 1.3e-9 km2 |
| 14 cm2 | 1.4e-9 km2 |
| 15 cm2 | 1.5e-9 km2 |
| 16 cm2 | 1.6e-9 km2 |
| 17 cm2 | 1.7e-9 km2 |
| 18 cm2 | 1.8e-9 km2 |
| 19 cm2 | 1.9e-9 km2 |
| 20 cm2 | 2e-9 km2 |
| 25 cm2 | 2.5e-9 km2 |
| 30 cm2 | 3e-9 km2 |
| 40 cm2 | 4e-9 km2 |
| 50 cm2 | 5e-9 km2 |
| 60 cm2 | 6e-9 km2 |
| 70 cm2 | 7e-9 km2 |
| 75 cm2 | 7.5e-9 km2 |
| 80 cm2 | 8e-9 km2 |
| 90 cm2 | 9e-9 km2 |
| 100 cm2 | 1e-8 km2 |
| 120 cm2 | 1.2e-8 km2 |
| 150 cm2 | 1.5e-8 km2 |
| 200 cm2 | 2e-8 km2 |
| 250 cm2 | 2.5e-8 km2 |
| 300 cm2 | 3e-8 km2 |
| 400 cm2 | 4e-8 km2 |
| 500 cm2 | 5e-8 km2 |
| 750 cm2 | 7.5e-8 km2 |
| 1,000 cm2 | 1e-7 km2 |
| 1,500 cm2 | 1.5e-7 km2 |
| 2,000 cm2 | 2e-7 km2 |
| 5,000 cm2 | 5e-7 km2 |
| 10,000 cm2 | 0.000001 km2 |
Questions
How many square kilometers are in a square centimeter?
1e-10 square kilometers.
How do I convert square centimeters to square kilometers in a spreadsheet?
Put the value in A1 and type =A1*1e-10, then fill the formula down the column.
Are the values in the table exact?
They are calculated from the exact definitions of the units and rounded only for display. Open any row for the full working.