Acre to Hectare Conversion Guide — Farmers & Buyers 2026

One acre is 0.404686 hectares, and one hectare is 2.47105 acres. This guide covers the formula, the history behind both units, and the numbers farmers and buyers actually use.

The formula

hectares = acres × 0.404686. acres = hectares × 2.47105. One hectare is a square 100 m on each side — exactly 10,000 m².

Quick reference

1 ac = 0.40 ha · 5 ac = 2.02 ha · 10 ac = 4.05 ha · 25 ac = 10.12 ha · 50 ac = 20.23 ha · 100 ac = 40.47 ha · 640 ac = 259 ha (one square mile).

Where each unit is used

Acres dominate the US, UK and India for land sale; hectares are standard across the EU, Australia, Canada and in all agricultural statistics and subsidy paperwork.

The origin of the acre

An acre was the area one man with one ox could plough in a day — a furlong (220 yd) long by a chain (22 yd) wide, which is 4,840 square yards or 4,046.86 m².

Other land units you'll meet

1 bigha (varies by Indian state, ~1,600–2,700 m²) · 1 guntha = 101.17 m² · 1 cent = 40.47 m² · 1 rood = 0.25 acre · 1 square mile = 640 acres = 259 hectares.

Practical scale checks

A football pitch is roughly 1.76 acres (0.71 ha). A typical UK residential plot is 0.1–0.2 acre. A commercial dairy farm in the EU averages 60–100 ha.

Sources & further reading

BIPM — The International System of Units (SI Brochure)
NIST — Guide for the Use of the International System of Units
WHO — Body weight & health guidance

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