How do I convert in² to km²?

Use the formula shown above or enter a value to see in² converted to km² instantly.

What is the formula for in² to km²?

The converter calculates km² by applying the category-specific conversion factor for Area.

When should I use in² vs km²?

in² and km² 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 in² to km²

Use the live converter below to translate between Square Inch (in²) and Square Kilometer (km²). 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

in² → km²

Square Inch

in²

Square Kilometer

6.4516×10^-10

km²

Rounded result (4 decimals max)

Formula

1 in² = 6.4516×10^-10 km²

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 km² to in².

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in² to km² 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 Inch (in²)	Square Kilometer (km²)
0.25 in²	1.6129×10^-10 km²
0.5 in²	3.2258×10^-10 km²
1 in²	6.4516×10^-10 km²
2 in²	1.29032×10^-9 km²
5 in²	3.2258×10^-9 km²
10 in²	6.4516×10^-9 km²
25 in²	1.6129×10^-8 km²
100 in²	6.4516×10^-8 km²

km² back to in²

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

Square Kilometer (km²)	Square Inch (in²)
0.25 km²	387,500,775.0016 in²
0.5 km²	775,001,550.0031 in²
1 km²	1.55×10^9 in²
2 km²	3.10001×10^9 in²
5 km²	7.75002×10^9 in²
10 km²	1.55×10^10 in²
25 km²	3.87501×10^10 in²
100 km²	1.55×10^11 in²