How do I convert ha to mi²?

Use the formula shown above or enter a value to see ha converted to mi² instantly.

What is the formula for ha to mi²?

The converter calculates mi² by applying the category-specific conversion factor for Area.

When should I use ha vs mi²?

ha and mi² 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 ha to mi²

Use the live converter below to translate between Hectare (ha) and Square Mile (mi²). 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

ha → mi²

Hectare

Square Mile

0.0039

mi²

Rounded result (4 decimals max)

Formula

1 ha = 0.0039 mi²

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

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ha to mi² quick table

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

Hectare (ha)	Square Mile (mi²)
0.25 ha	0.001 mi²
0.5 ha	0.0019 mi²
1 ha	0.0039 mi²
2 ha	0.0077 mi²
5 ha	0.0193 mi²
10 ha	0.0386 mi²
25 ha	0.0965 mi²
100 ha	0.3861 mi²

mi² back to ha

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

Square Mile (mi²)	Hectare (ha)
0.25 mi²	64.7497 ha
0.5 mi²	129.4994 ha
1 mi²	258.9988 ha
2 mi²	517.9976 ha
5 mi²	1,294.9941 ha
10 mi²	2,589.9881 ha
25 mi²	6,474.9703 ha
100 mi²	25,899.8811 ha