Convert Square centimetres to Square kilometres
1 square centimetre is 1.00e-10 km². One square centimetre is exactly 1e-10 square kilometres.
One square centimetre is 1.0000 × 10^-10 square kilometres. To convert square centimetres to square kilometres, multiply by 1.0000 × 10^-10; to go the other way, divide by 1.0000 × 10^-10 or multiply by 10000000000. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Office of Weights and Measures. A ten-thousandth of a square metre — not a hundredth, which is the mistake squaring a prefix invites.
Factor checked against the defining standard · How we check
- Square centimetres × 1.0000 × 10^-10
1 * 1e-100 km²
1 square centimetre in every area unit
| Unit | Value | Exact factor |
|---|---|---|
| square inches | 0.15500031 sq in | × 0.155000310001 |
| square feet | 0.001076391042 sq ft | × 0.00107639104167 |
| square yards | 0.0001195990046 sq yd | × 0.00011959900463 |
| acres | 0.00000002471053815 ac | × 0.0000000247105381467 |
| square meters | 0.0001 m² | × 0.0001 |
| square millimetres | 100 mm² | × 100 |
| square centimetres (as entered) | 1 cm² | — |
| square kilometres | 0.0000000001 km² | × 0.0000000001 |
| square miles | 0.00000000003861021585 mi² | × 0.0000000000386102158542 |
| hectares | 0.00000001 ha | × 0.00000001 |
Factors are entered by hand from NIST Office of Weights and Measures rather than derived from a units library, so the ones that terminate are exact rather than rounded.
The same converter answers this pair however it is written: sqcm to sqkm is how the symbols are typed on a keyboard with no superscript on it.
How do you convert square centimetres to square kilometres? The converter and the working
- 1.Take the measurement in square centimetres.
- 2.Multiply by 1.0000 × 10^-10 — that is how many square kilometres fit in one square centimetre.
- 3.To go back the other way, divide by 1.0000 × 10^-10, or multiply by 10000000000.
Worked example: 25 square centimetres to square kilometres
- Formula
- cm² × 1.0000 × 10^-10 = km²
- Arithmetic
- 25 × 1.0000 × 10^-10 = 2.50e-9 km²
- Answer
- 25 cm² = 2.50e-9 km²
The factor is rounded for display; the figure above is computed from the full value.
Square centimetres to square kilometres conversion table
| Square centimetres | Square kilometres |
|---|---|
| 1 cm² | 1.00e-10 km² |
| 2 cm² | 2.00e-10 km² |
| 3 cm² | 3.00e-10 km² |
| 4 cm² | 4.00e-10 km² |
| 5 cm² | 5.00e-10 km² |
| 6 cm² | 6.00e-10 km² |
| 7 cm² | 7.00e-10 km² |
| 8 cm² | 8.00e-10 km² |
| 9 cm² | 9.00e-10 km² |
| 10 cm² | 1.00e-9 km² |
| 12 cm² | 1.20e-9 km² |
| 15 cm² | 1.50e-9 km² |
| 20 cm² | 2.00e-9 km² |
| 25 cm² | 2.50e-9 km² |
| 50 cm² | 5.00e-9 km² |
| 100 cm² | 1.00e-8 km² |
| 200 cm² | 2.00e-8 km² |
| 300 cm² | 3.00e-8 km² |
| 500 cm² | 5.00e-8 km² |
| 1000 cm² | 1.00e-7 km² |
| 2000 cm² | 2.00e-7 km² |
| 5000 cm² | 5.00e-7 km² |
| 10000 cm² | 0.000001 km² |
What is a square centimetre?
A ten-thousandth of a square metre — not a hundredth, which is the mistake squaring a prefix invites. 10,000 cm² to the square metre.
What is a square kilometre?
A million square metres, or 100 hectares. The unit land area and population density are published in everywhere except the US.
How many square kilometres are in a square centimetre?
One square centimetre is 1.0000 × 10^-10 square kilometres. Going the other way, one square kilometre is 10000000000 square centimetres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every area unit here
The whole group — 10 units with their symbols and the size of each one in square meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a square centimetre.
Cite this page
- APA
- Rule Calculator. (2026). Convert Square centimetres to square kilometres. Rule Calculator. https://rulecalculators.com/convert/square-centimeter-to-square-kilometer
- MLA
- "Convert Square centimetres to square kilometres." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/square-centimeter-to-square-kilometer.
- Chicago
- Rule Calculator. "Convert Square centimetres to square kilometres." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/square-centimeter-to-square-kilometer.
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Questions people actually ask
- How many square kilometres are in a square centimetre?
- 1.0000 × 10^-10. A million square metres, or 100 hectares. The unit land area and population density are published in everywhere except the US.
- How do I convert square kilometres back to square centimetres?
- Divide by 1.0000 × 10^-10, or multiply by 10000000000 — they are the same operation.
Other area conversions
Square kilometres to square centimetres — the same conversion the other way.