Hectares to Acres converter (ha → ac)

ha to ac formula

Worked example: 10 ha = 24.7105 ac. The defining value behind this factor is documented on our area & land measurement standards page.

Hectares to Acres chart

Includes standard reference values plus the specific numbers people search for most.

Most-searched ha to ac answers

When to convert ha to ac

• ▸Real estate — listings quote homes in ha in some countries and ac elsewhere; 4 ha is the size buyers see in one market.
• ▸Land & farming — farmland is measured in acres in the US, hectares in Europe and India, and bigha in parts of South Asia.
• ▸Flooring & renovation — carpet and tile are sold in ha per unit, but room dimensions may be in ac.
• ▸Solar panel & roof surveys — installer quotes give roof area in the unit local to your country.

Common mistakes

• ✕Squaring the linear factor only once — 1 m = 3.281 ft, but 1 m² = 10.764 ft² (factor squared).
• ✕Confusing acres with hectares (1 ha ≈ 2.471 acres).
• ✕The US survey acre differs slightly from the international acre. Land titles recorded using the US survey foot give an acre of about 4046.87261 m² — roughly 0.0004% larger than the international acre of 4046.8564224 m². On a single residential plot this is a few square centimetres. On a large ranch it can be several square metres, which is why legal descriptions state which foot was used.

Regional usage & source

Square meters, hectares and square kilometers are the global standard. Acres and square feet dominate US real estate; square meters and are/hectare are standard across Europe and India uses acres, bigha and hectares interchangeably.

Reference: 1 acre = 4046.8564224 m² = 0.40468564224 ha, per the international foot definition (NIST).

How these numbers are produced and rounded: methodology.

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