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# Convert Square Meter to Acre

Please provide values below to convert square meter [m^2] to acre [ac], or vice versa.

 From: square meter To: acre

### Square meter

Definition: The square meter, or square metre (symbol: m2), is an SI (International System of Units) derived unit of area. It is defined as the area of a square with side measures of one meter, where the meter is currently defined as the distance traveled by light in 1/299 792 458 of a second when expressed in the unit m·s-1, where the second is defined in terms of the cesium frequency, ΔνCs.

History/origin: Area is commonly represented in the form of a square with sides of a specific unit of length, written as "square" followed by the chosen unit of length. The square meter is one of many such units and is derived from the area of a square with sides of one meter.

Current use: The square meter is the SI unit of area, though it is considered an SI derived unit rather than an SI unit. It is most often used to measure land area such as rooms, houses, and large plots of land. As with other SI units, the standard prefixes can be applied to the square meter to signify decimal multiples. Examples of this include the square decameter, square hectometer, and square kilometer. However, these larger measurements are typically not used, as the square meter is already a fairly sizeable measurement, and these prefixes would be referring to large areas that are not commonly referenced. Note that the square meter and its multiples and submultiples are squared, making a square decameter 10,000 times the size of a square meter even though a decameter is 100 times the size of a meter.

### Acre

Definition: An acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (66 feet) by 1 furlong (660 feet), which is exactly equal to 1/640 of a square mile, 43,560 square feet, or exactly 4046.8564224 square meters.

History/origin: In the Middle Ages, the acre was defined as the area that a yoke (pair) of oxen could typically plow within one day, using a wooden plow. Before the metric system was adopted, many countries used their own versions of the acre. The most commonly used acre today, the international acre, is based on the international yard, which was defined in 1959.

Current use: Acres are used in countries including the United States, the UK, Ghana, India, Canada, and others. The United States (US) uses both international as well as US survey acres (~4047 square meters), which vary based on which type of yard is used in the measurement. However, area measurements are typically not accurate enough for the difference between the two acre measurements to be detectable.

### Square Meter to Acre Conversion Table

Square Meter [m^2]Acre [ac]
0.01 m^22.4710538146717E-6 ac
0.1 m^22.47105E-5 ac
1 m^20.0002471054 ac
2 m^20.0004942108 ac
3 m^20.0007413161 ac
5 m^20.0012355269 ac
10 m^20.0024710538 ac
20 m^20.0049421076 ac
50 m^20.0123552691 ac
100 m^20.0247105381 ac
1000 m^20.2471053815 ac

### How to Convert Square Meter to Acre

1 m^2 = 0.0002471054 ac
1 ac = 4046.8564224 m^2

Example: convert 15 m^2 to ac:
15 m^2 = 15 × 0.0002471054 ac = 0.0037065807 ac