How do I convert km² to acre?

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

What is the formula for km² to acre?

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

When should I use km² vs acre?

km² and acre 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 acre

Use the live converter below to translate between Square Kilometer (km²) and Acre (acre). 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 → acre

Square Kilometer

km²

Acre

247.1054

acre

Rounded result (4 decimals max)

Formula

1 km² = 247.1054 acre

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 acre to km².

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km² to acre 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)	Acre (acre)
0.25 km²	61.7763 acre
0.5 km²	123.5527 acre
1 km²	247.1054 acre
2 km²	494.2108 acre
5 km²	1,235.5269 acre
10 km²	2,471.0538 acre
25 km²	6,177.6345 acre
100 km²	24,710.5381 acre