How do I convert km² to cm²?

Use the formula shown above or enter a value to see km² converted to cm² instantly.

What is the formula for km² to cm²?

The converter calculates cm² by applying the category-specific conversion factor for Area.

When should I use km² vs cm²?

km² and cm² are both part of the Area category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Area Converter & Surface Reference

Convert km² to cm²

Use the live converter below to translate between Square Kilometer (km²) and Square Centimeter (cm²). Scroll further for quick examples, formula tips, and related units.

Formula insight: Most unit conversions use a simple multiplication or division by a conversion factor. The calculator shows the exact formula used.

Convert

km² → cm²

Square Kilometer

km²

Square Centimeter

1.00000×10^10

cm²

Rounded result (4 decimals max)

Formula

1 km² = 1.00000×10^10 cm²

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table

Results update as you type. Swap the direction to convert back from cm² to km².

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km² to cm² quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Square Kilometer (km²)	Square Centimeter (cm²)
0.25 km²	2.5×10^9 cm²
0.5 km²	5.00000×10^9 cm²
1 km²	1.00000×10^10 cm²
2 km²	2.00000×10^10 cm²
5 km²	5.00000×10^10 cm²
10 km²	1.00000×10^11 cm²
25 km²	2.5×10^11 cm²
100 km²	1.00000×10^12 cm²

cm² back to km²

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Square Centimeter (cm²)	Square Kilometer (km²)
0.25 cm²	2.5×10^-11 km²
0.5 cm²	5.00000×10^-11 km²
1 cm²	1.00000×10^-10 km²
2 cm²	2.00000×10^-10 km²
5 cm²	5.00000×10^-10 km²
10 cm²	1.00000×10^-9 km²
25 cm²	2.5×10^-9 km²
100 cm²	1.00000×10^-8 km²