The acre is a traditional area unit used especially in the imperial and US customary measurement systems for measuring land. It is exactly equal to 4,046.8564224 square meters, and appears frequently in real estate, farmland and property listings.
Square meters and hectares are standard in many countries, while international real-estate listings and English-language land documents frequently use acres. Converting acres to square meters or hectares makes cross-border comparisons clearer.
Acre facts
- Symbol
- ac
- 1 acre
- 4,046.8564224 m²
- 1 acre
- 43,560 square feet
- Unit system
- Imperial and US customary systems
- 1 hectare
- ≈ 2.471 acres
What is an acre?
The acre is a unit used to express land area, exactly equal to 4,046.8564224 square meters. It is one of the standard units of land measurement in English-speaking countries, especially the United States and the United Kingdom.
An acre is roughly the size of two-thirds of a football field — a visual comparison often used to give a concrete sense of how large an acre actually is.
The acre is used to express land size across a wide range of contexts, from farmland to residential lots, from forested areas to national parks.
The historical origin of the acre
The word "acre" derives from a Middle English root meaning "field". Historically, an acre was defined as the area of field a pair of oxen could plow in one day — it was born as a practical agricultural measure.
This historical definition rests on the product of a standard ox-plow width (one rod, about 5.03 meters) and a day's plowing distance (one furlong, about 201 meters), which forms the basis of the modern acre definition.
With the International Yard and Pound Agreement signed in 1959, the acre was fixed exactly at 4,046.8564224 square meters through the metric system.
Why is the acre still used?
In the United States and the United Kingdom, the real estate and agriculture sectors continue to use the acre unit due to historical habit and well-established legal documentation.
For anyone making international real estate investments or examining US/UK-originated land listings, converting between acres and square meters is a practical necessity for understanding the true size of a property.
In agricultural statistics (such as US farm data), planted area sizes are frequently reported in acres; these values need to be converted to square meters or hectares for international comparisons.
The acre and other area units
1 acre equals 4,046.8564224 square meters, approximately 0.4047 hectares and exactly 43,560 square feet.
1 hectare is approximately equal to 2.471 acres, which is why the acre and the hectare are frequently converted between one another when comparing large farmland areas.
In the US measurement system, 1 acre equals 43,560 square feet — a value used especially in US-originated construction and land development projects.
Acre timeline
An agricultural origin
The acre was defined as the area of field a pair of oxen could plow in one day; this practical measure gradually became a standard land unit.
Legal standardization in the United Kingdom
The acre gained official legal status as an area unit under the Weights and Measures Act in the United Kingdom.
An international metric definition
Under the International Yard and Pound Agreement, the acre was fixed exactly to the metric system at 4,046.8564224 square meters.
Acre conversion tools
Frequently asked questions
How many square meters is 1 acre?
1 acre is exactly equal to 4,046.8564224 square meters. To convert acres to square meters, multiply the value by 4,046.8564224.
How many acres is 1 square meter?
1 square meter is approximately equal to 0.000247105 acres. To convert square meters to acres, divide the value by 4,046.8564224.
How many square feet is 1 acre?
1 acre is exactly equal to 43,560 square feet. This relationship is commonly used in US land and development documents.
How many acres is 1 hectare?
1 hectare is approximately equal to 2.471 acres. To convert hectares to acres, multiply the value by approximately 2.471.