Convert Square Kilometres to Square Centimeters (km2 to cm2)
1 square kilometre (km²) = 10000000000 square centimeters (cm²). 1 cm² = 1 × 10⁻¹⁰ km². Example: 15 km² = 15 × 10000000000 = 150000000000 cm².
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1 km² = 10000000000 cm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square kilometre to square centimeter converter to paste a column from Excel.
How to Convert Square Kilometre to Square Centimeter
- 1 km² = 10000000000 cm²
- 1 cm² = 1 × 10⁻¹⁰ km²
- Example: convert 15 km² to cm²: 15 km² = 15 × 10000000000 cm² = 150000000000 cm²
Formula
cm² = km² × 10000000000
Derivation from SI units:
- 1 km² = (1000 m)² = 10⁶ m² = 100 ha
- 1 cm² = (0.01 m)² = 10⁻⁴ m²
- 1 km² = 1000000 m² ÷ 0.0001 m² per cm² = 10000000000 cm²
Both units are defined exactly, so the factor is exact. Square Kilometre definition: square kilometre; Square Centimeter definition: square centimeter.
Worked examples
- A reading of 2 km² converts to 20000000000 cm².
2 km² × 10000000000 = 20000000000 cm² - A value of 50 km² is 500000000000 cm².
50 km² × 10000000000 = 500000000000 cm²
Square Kilometre to Square Centimeter conversion table
| Square Kilometres (km²) | Square Centimeters (cm²) |
|---|---|
| 0.01 km² | 100000000 cm² |
| 0.1 km² | 1000000000 cm² |
| 0.5 km² | 5000000000 cm² |
| 1 km² | 10000000000 cm² |
| 2 km² | 20000000000 cm² |
| 5 km² | 50000000000 cm² |
| 10 km² | 100000000000 cm² |
| 25 km² | 250000000000 cm² |
| 50 km² | 500000000000 cm² |
| 100 km² | 1000000000000 cm² |
| 1000 km² | 10000000000000 cm² |
| 10000 km² | 100000000000000 cm² |
Where it's used
Square Kilometres are used for city, lake and country areas, while square centimeters appear in test areas in air-permeability testing (ISO 9237: 5, 10, 20, 50, 100 cm²; ASTM D737: 38.3 cm²). Both measure area, so the conversion is a fixed factor.
Square Kilometre to other area units
| Conversion | 1 km² equals |
|---|---|
| square kilometre to square centimeter | 10000000000 cm² |
| square kilometre to square meter | 1000000 m² |
| square kilometre to square foot | 10763910.42 ft² |
| square kilometre to square inch | 1550003100 in² |
| square kilometre to hectare | 100 ha |
| square kilometre to acre | 247.1053815 ac |
| square kilometre to square millimeter | 1000000000000 mm² |
| square kilometre to square yard | 1195990.046 yd² |
Show 1 more units
| square kilometre to square mile | 0.3861021585 mi² |
|---|
Frequently asked questions
How many square centimeters are in 1 square kilometre?
1 km² = 10000000000 cm².
How do I convert square kilometres to square centimeters?
Multiply the value in km² by 10000000000. For example, 15 km² × 10000000000 = 150000000000 cm².
Is the km² to cm² conversion exact?
Yes. Both units are defined exactly, and 1 km² is exactly 10000000000 cm².
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2 with SI prefix centi.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Kilometres to Square Centimeters (km2 to cm2). Retrieved October 25, 2026, from https://scientificconverters.com/area/square-kilometers-to-square-centimeters/
IEEE
Scientific Converters, "Convert Square Kilometres to Square Centimeters (km2 to cm2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/area/square-kilometers-to-square-centimeters/