Aresto Hectares Converter
Convert between ares and hectares instantly. Also shows square meters, acres, and square feet for comprehensive land area conversion.
Formula
Hectares = Ares ÷ 100 | Ares = Hectares × 100
One hectare equals exactly 100 ares. One are equals 100 square meters, and one hectare equals 10,000 square meters. The conversion is a simple factor of 100 in either direction.
Worked Examples
Example 1: Farm Plot Conversion
Problem:A French farmer owns a field listed as 450 ares. Convert this to hectares, acres, and square meters.
Solution:Hectares = 450 / 100 = 4.5 ha Square meters = 450 × 100 = 45,000 m² Acres = 45,000 / 4,046.856 = 11.12 acres
Result:4.5 hectares | 45,000 m² | 11.12 acres
Example 2: Residential Plot
Problem:A property listing in Switzerland shows a plot of 0.08 hectares. Convert to ares and square meters.
Solution:Ares = 0.08 × 100 = 8 ares Square meters = 0.08 × 10,000 = 800 m² Square feet = 800 × 10.764 = 8,611 sq ft
Result:8 ares | 800 m² | 8,611 sq ft
Frequently Asked Questions
What is an are and how does it relate to a hectare?
An are is a metric unit of area equal to 100 square meters. It was originally defined in the French metric system during the 1790s as the primary unit of land measurement. A hectare equals exactly 100 ares, or 10,000 square meters. The word 'hectare' literally combines 'hecto' (meaning 100) with 'are.' While the hectare became the dominant unit for measuring agricultural land and large plots worldwide, the are remains useful for smaller parcels such as residential lots. In many European countries, the are and its derivative, the centiare (1 square meter), are still used in property descriptions and legal land documents.
How do I convert ares to hectares and vice versa?
Converting between ares and hectares is straightforward because they share a clean decimal relationship. To convert ares to hectares, divide the number of ares by 100. For example, 250 ares equals 2.5 hectares. To convert hectares to ares, multiply the number of hectares by 100. So 3.75 hectares equals 375 ares. This simple factor-of-100 relationship exists because the metric system was designed around powers of ten. You can also think of it in terms of square meters: multiply ares by 100 to get square meters, or multiply hectares by 10,000 to get square meters, then convert between the two using the appropriate factor.
Where are ares commonly used as a unit of measurement?
Ares are most commonly used in European countries for measuring small to medium-sized land areas, particularly in real estate and agriculture. In France, Belgium, Switzerland, and Luxembourg, property listings and land registries frequently express areas in ares and centiares. Germany, the Netherlands, and several Eastern European nations also use ares for cadastral surveys and land transactions. Japan uses a similar unit called the 'a' that is equivalent to the are. In contrast, English-speaking countries like the United States and the United Kingdom predominantly use acres and square feet. International scientific contexts tend to prefer hectares or square kilometers for larger areas.
How do ares and hectares compare to acres and square feet?
One are equals 100 square meters, which is approximately 1,076.39 square feet or about 0.02471 acres. One hectare equals 10,000 square meters, roughly 2.471 acres, or about 107,639 square feet. To put this in perspective, an American football field (including end zones) is approximately 0.535 hectares or 53.5 ares. A standard tennis court is about 2.6 ares. An acre, the common imperial land unit, is approximately 40.47 ares or 0.4047 hectares. These conversions are essential when dealing with international real estate or agricultural data, as different countries use different land area measurement systems.
Why was the are created and how did it become part of the metric system?
The are was created during the French Revolution as part of the comprehensive metric reform of 1795. The French National Assembly sought to replace the chaotic patchwork of feudal land measurement units — which varied from region to region — with a rational, decimal-based system. The are was defined as 100 square meters, making it easy to scale up (hectare = 100 ares) or down (centiare = 0.01 are = 1 square meter). Although the International System of Units (SI) does not officially include the are, the hectare is accepted for use with SI. The are filled an important niche for everyday land transactions where square meters were too small and hectares too large.
What is a centiare and where does it appear in land records?
A centiare is one hundredth of an are, which makes it exactly one square meter. It exists so a cadastral entry can be written entirely in the are family without switching units. French, Belgian and Luxembourgish land registers routinely record a parcel as a string of hectares, ares and centiares, for example 1 ha 32 a 47 ca. Because a centiare is simply a square meter, you can read the last group of any such entry directly as square meters with no arithmetic at all.
How do I read a plot recorded as 2 ha 45 a 30 ca?
Expand each group into square meters and add them. Two hectares is 2 times 10,000, or 20,000 square meters; 45 ares is 45 times 100, or 4,500 square meters; 30 centiares is 30 square meters. The total is 24,530 square meters. Expressed as a single figure that is 245.30 ares or 2.4530 hectares. The notation is effectively a decimal breakdown, so once the total is in square meters you can shift the decimal point two places for ares and four places for hectares.
How many ares are there in a square kilometer?
A square kilometer is 1,000,000 square meters. Dividing by the 100 square meters in an are gives 10,000 ares, which is also 100 hectares. This chain of factors of one hundred is deliberate: centiare, are, hectare and square kilometer each step up by a factor of 100 because the underlying linear units step up by a factor of 10 and area scales with the square of length. Knowing the chain lets you move between any two of them by shifting the decimal point in steps of two.
Should a building plot be quoted in ares or in square meters?
Square meters are the clearer choice for anything a builder will work with, because setbacks, footprints and floor areas are all specified in meters and no mental conversion is needed. Ares suit the transaction side: a plot of 800 square meters reads as 8 ares, a compact figure that matches how notaries and cadastral registers describe parcels. A common working practice is to quote the registry figure in ares and centiares while carrying square meters through the design and permit drawings.
How do I compare a price per hectare with a price per are?
Because one hectare is 100 ares, divide a per-hectare price by 100 to get the equivalent price per are, and multiply a per-are price by 100 to compare it with per-hectare figures. Divide by 100 once more to reach a price per square meter. Agricultural land is normally advertised per hectare while building plots are quoted per are or per square meter, so putting both onto one basis is the only fair way to compare a farm parcel against a subdivided residential lot.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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