Convert acres to hectares

One acre equals 0.404686 hectares. To convert any number of acres to hectares, multiply by 0.40468564.

The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.

Area conversions carry a trap that catches people who are perfectly comfortable with length: the factor is squared. There are 3.28 feet in a metre but 10.76 square feet in a square metre, and using the linear factor is the most common error in property arithmetic. Beyond that, land is measured in whatever the local convention prescribes — acres, hectares, and across South Asia bigha, katha and gaj — so the same plot is routinely described in two units that need reconciling.

acres to hectares formula

To go the other way, use acre = hectare ÷ 0.40468564.

About these units

An acre is 43,560 square feet, historically about the area one person could plough in a day with a yoke of oxen. It is still standard in US and UK land dealings.

A hectare is 10,000 square metres — a square 100 metres on each side. It is the standard unit for agricultural land in most of the world.

Acre is also written acres. Hectare is also written hectares.

Sources

1. National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.