acres to square meters

American land is bought, sold, and taxed in acres; the international real-estate and agricultural world thinks in square meters and hectares. The legal bridge is exact: since the 1959 yard-and-pound agreement, one acre has been defined as precisely 4,046.8564224 square meters. A one-acre suburban lot is 4,047 m²; a quarter-acre is 1,012 m²; a 40-acre farm parcel is 161,874 m².

By EnginStack Engineering Team | Verified by engineers, built on NIST metrology standards About →
acres
1 square meters
1 acre = 4,046.8564224 square meters 1 square meter = 0.00024711 acre

Verified against NIST Special Publication 811 and BIPM SI definitions. The conversion factor is exact and traceable to the 1959 treaty constants.

acres to square meters

The acre's metric value is one of the most useful exact constants in real-estate work, because every American deed eventually meets a metric survey. One acre = 4,046.8564224 m² exactly — no rounding, because the 1959 treaty fixed both the yard and the acre simultaneously. Land surveyors working across systems multiply acres by 4,046.8564224 and get square meters to full precision; dividing by the same constant does the reverse. The number also maps neatly to the hectare: 2.4710538 acres make a hectare.

square meters = acres × 4,046.8564224
1 acre = 4,046.8564224 square meters — the 1959 treaty value
The factor is exact by definition.

Common acres to square meters Conversions

acressquare metersContext
0.25 acre1,011.7 m²A quarter-acre residential lot.
1 acre4,046.9 m²The definitional anchor.
2.47 acres10,000 m²Roughly one hectare.
40 acres161,874 m²A standard US farm parcel.
640 acres2,590,000 m²One section — one square mile of land.

Engineering Context

The square meters to acres page inverts this factor. In the area hub, acres to hectares is the farm-world conversion, and acres to square feet handles the US-internal scale. The 640-acre section ties into the length family's mile — a section is one square mile.

More: m² to acres · acres to ha · acres to ft² · Area Hub

Related Unit Converters

Square Meters To Acres Acres To Hectares Acres To Square Feet Area Converters

Frequently Asked Questions

How many square meters is one acre?

Exactly 4,046.8564224 m², per the 1959 yard-and-pound agreement. This is a legal definition, not a rounded figure — the acre's metric value is exact to ten digits.

How many acres are in a hectare?

Exactly 2.4710538146717. A hectare is 10,000 m², and since an acre is 4,046.8564224 m², the ratio is 10,000 / 4,046.8564224.

Why do American deeds still use acres?

Because the US land-survey system — the Public Land Survey System of townships and sections — was built on the acre and the mile in the 18th century, and every parcel boundary since has been recorded in those units. The acre persists by legal continuity, not by preference.