Convert acres to m² acres ↔ square metres Free Online Secure
Type a value in acres and read it in square metres at once. The factor is exact by definition, the arithmetic happens in your browser, and nothing is sent anywhere.
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Common values — Convert acres to m² (acres ↔ square metres)
| ac | m² |
|---|---|
| 1 | 4046.8564224 |
| 2 | 8093.7128448 |
| 3 | 12140.5692672 |
| 5 | 20234.282112 |
| 10 | 40468.564224 |
| 20 | 80937.128448 |
| 50 | 202342.82112 |
| 100 | 404685.64224 |
Where these units come from
Square units need no definition of their own: a square metre is a metre by a metre, and everything follows from the length. The land measures are older and stranger. The acre began as the land a yoke of oxen could plough in a day, which is why it was long and thin rather than square — one chain by one furlong, 4840 square yards. The hectare and the are came out of the French Revolution, when land had to be measured in something decimal; neither belongs to the International System, but both were kept for land because a hectare is a comfortable size to picture and a square metre is not. Since the 1959 agreement on the yard, the acre is exactly 4046.8564224 square metres, so the conversions on this page are exact rather than approximate.
Where you meet them
Square metres price flats, size carpets and decide how much paint a wall needs; square feet do the same work in the United States and in much of the property market worldwide. Hectares belong to farmland, forests and planning permissions; acres to land deeds in the English-speaking world. Square kilometres and square miles are for countries, lakes and fires. Square centimetres and square millimetres live in workshops, on datasheets and anywhere a cross-section matters.
Questions people ask
Is an acre the same in the United States?
For every practical purpose, yes. The international acre used here is exactly 4046.8564224 m². The United States also kept a survey acre, based on a slightly different foot, which was larger by about four parts in a million — a difference of some 160 cm² in an acre, invisible except in large land surveys. That survey foot was formally retired at the end of 2022, so only one acre is now in use.
How big is a square metre in practice?
A square one metre on each side. A standard interior door is about 1.8 square metres, a single bed about 2 and a small bathroom around 4. Floor space, paint coverage and property prices are usually quoted per square metre, so a rough feel for the size helps you judge whether a listed figure is generous or tight.
Is the answer exact?
Where both units are defined in terms of one another by whole numbers, yes — the page says so above the figure, and the only rounding is in how many digits are shown. Where the ratio has no finite decimal, the page shows twelve significant digits and says the relation is approximate rather than pretending otherwise.
Does anything I type leave my device?
No. The arithmetic runs in your browser; nothing is uploaded and there is no server to upload it to. Load the page once and it keeps working with the network switched off.
From the acre to the square metre: reading a plot in plain metric
When a plot is advertised in acres, most of the world has no instinct for its size. A square metre, on the other hand, everyone can picture: a floor tile, a small balcony, a quarter of a double bed. To convert acres to m² you multiply by 4,046.86, which turns a figure like 2.5 acres into 10,117 square metres. That number can be compared directly with a building permit, a cadastral extract or the plan of a house. This page multiplies as you type, and the text below shows what the result means on real land, in parks, farms and old units of different countries.
Below you will find the rule with examples, short profiles of both units, a comparison, a tour of real situations and the mistakes people make most often. The calculation runs in your browser, and nothing you type is sent anywhere.
How to convert acres to m²: multiply by 4,046.86
The rule
One acre is exactly 4,046.8564224 square metres. To convert acres to m², multiply the acres by 4,046.86. Half an acre is 2,023.4 m², one acre 4,046.9 m², two acres 8,093.7 m² and ten acres 40,468.6 m². To go back, divide the square metres by 4,046.86.
Worked examples
A lot of 0.33 acre is 1,335.4 m². A smallholding of 4.5 acres is 18,210.9 m². A farm of 120 acres is 485,623 m², nearly half a square kilometre. For a quick check, multiply the acres by 4,000 and add one per cent: 3 acres gives 12,000 plus 120, so 12,120, and the exact answer is 12,140.6.
Large numbers
Square metres produce long numbers quickly. When the answer is above 100,000, switch to hectares by dividing by 10,000, so 485,623 m² becomes 48.56 ha. That is often a more readable way to state the same area.
A quick check
The square metre is much smaller than the acre, so the number grows by about four thousand. If your “convert acres to m²” calculation produced a number with fewer digits than the acres you began with, you divided.
The acre
The plough day
The acre equals 43,560 square feet. It began as the area a pair of oxen could plough in a day and was later fixed as a strip a furlong long and a chain wide. The modern value in metric terms was fixed together with the yard and the pound in 1959.
A size to picture
A square acre would be 63.6 metres on each side, about two thirds of a football pitch lengthwise. It is the size of a generous suburban lot or a very small field.
The square metre
A square with a side of one metre
The square metre is the SI unit of area. It is the area of a square one metre by one metre, which is 10.76 square feet. It is used to measure rooms, flats, building plots and shops across most of the world. A standard kitchen is 8 to 12 m², a classroom 50 to 60 m².
Where you meet it
Land registers, cadastres, planning permissions, property listings and architectural drawings all use square metres and, for larger sites, hectares.
Acre and square metre compared
An acre holds about four thousand square metres. The two units belong to different scales: the acre to land that is measured in fields, the square metre to rooms and building plots. That is why a statement such as "the lot is 0.75 acre and the house 220 m²" mixes both worlds in one sentence.
If you are comparing prices, convert land to price per square metre. A price of 100,000 dollars for an acre is 24.7 dollars per square metre, an easy number to set against a city plot sold by the square metre.
Where the conversion appears
Famous grounds
The grounds of the All England Club in Wimbledon cover about 42 acres, which is 170,000 m². Dublin's Phoenix Park measures 1,752 acres, 7.09 million m², one of the largest walled parks in Europe. The Vatican Gardens are about 57 acres, or 230,700 m². A visitor with a metric map will read these figures only after a “convert acres to m²” calculation.
Property listings
An English country house with 5 acres is 20,234 m², while a London garden of 0.02 acre is 81 m². Listings from Ireland, the United Kingdom and the United States use acres and square feet, so an overseas buyer needs both factors.
Development sites
A residential scheme of 2.5 acres has 10,117 m². If the permit allows 40 homes, that is 253 m² of land per home, including roads and green space. Planners think in homes per acre, but drawings of individual plots are in square metres.
The acre foot
Water managers in the United States measure large volumes in acre feet, the volume of water that covers one acre to a depth of one foot. That is 1,233.5 cubic metres. A reservoir that holds 50,000 acre feet contains 61.7 million cubic metres. In California an acre foot is often described as enough for one or two households for a year, a useful way to picture the unit. A “convert acres to m²” calculation gives you the area part of the calculation.
Spreadsheet use
Put acres in column A and enter =A2*4046.8564224 in column B. Add a third column dividing by 10,000 to show hectares. A total row lets you compare the sum with the parcel area on your title. If the two disagree, look for a plot entered in the wrong unit.
Metes and bounds
American deeds in older states describe land as metes and bounds: a start, a series of distances in feet or rods, and the closing area in acres. A rod is 16.5 feet, 5.03 metres. To check such a description in metric, convert each side and the area separately, then compare the area with the figure obtained from the sides.
Space per person
An acre shared by 40 people gives each one 101 m², a typical urban density in some suburbs. An acre with one person has 4,047 m², the scale of a rural estate. Demographers use persons per square kilometre, but local planners prefer homes per acre, and the unit has to be converted before comparisons.
Swimming pools as a measure
An Olympic pool of 50 by 25 metres has 1,250 m², or 0.31 acre. An acre therefore holds 3.2 Olympic pools. A residential pool of 8 by 4 metres, 32 m², uses less than one per cent of an acre. Pool contractors use square metres, while land is sold in acres, so both appear in the same quote.
Teaching the idea
Give students a rope 63.6 metres long to mark an acre, then ask them to mark a square 10 metres by 10 metres, which is 100 m², inside it. They will see that 40 such squares fit with room to spare. The factor 4,046.86 becomes less abstract after that.
Orchards and fruit growing
A modern apple orchard holds 1,000 to 2,000 trees per acre on dwarf rootstocks, which is one tree for every 2 to 4 square metres. An old standard orchard has only 40 to 80 trees per acre, one tree for 50 to 100 m². A grower who compares yields per tree between the two systems must also compare the land each tree uses, and a “convert acres to m²” calculation makes that arithmetic quick.
Sports grounds in square metres
A football pitch of 105 by 68 metres is 7,140 m², 1.76 acres. A cricket oval may reach 15,000 m², 3.7 acres, and a rugby ground with its in goal areas 9,500 m², 2.3 acres. When a stadium plan is described in acres in one document and in square metres in another, the conversion keeps the discussion honest.
Allotment gardens and community plots
A British allotment is about 250 m², so an acre holds roughly 16 plots before paths and shared areas are removed. A community garden of 0.25 acre, 1,012 m², can serve 3 to 4 families on a full plot each. Garden associations state plot sizes in square metres and site sizes in acres, which is why a “convert acres to m²” calculation appears on so many newsletters.
Cattle, sheep and stocking rates
Stocking rates describe how many animals one acre of pasture can support: about 5 sheep or 0.4 cows on average grassland. In square metres, that is 810 m² per sheep and 10,000 m² per cow. These numbers vary with rainfall and soil, but they give a feel for how much land livestock farming needs.
Land art and large installations
Large land art pieces such as Spiral Jetty or Roden Crater are described by their length and by the area they occupy. A work covering 3 acres has 12,140 m². Artists, curators and visitors from different countries read the same plan in different units, so an exact conversion helps the catalogue stay correct.
The dunam
In Israel, Turkey, Jordan and Palestine land is measured in dunams, each equal to 1,000 square metres in the modern definition. One acre is therefore 4.05 dunams, and ten dunams are about 2.47 acres. News from the region mixes both units, so an international reader who knows the acre will find the dunam easy to grasp once the square metre is the common ground.
Wedding venues and festival sites
A festival field of 20 acres, 80,937 m², can host about 40,000 people at a density of two square metres per person in the crowd areas, with the rest used for stages, camping and services. Organisers calculate capacity in square metres, while the landowner quotes the field in acres, so the “convert acres to m²” calculation is the first step in a safety plan.
Small units for small plots
For a plot under one acre, the square metre is usually more comfortable than a decimal acre. A lot of 0.07 acre is 283 m², easier to picture than a tiny fraction. When you receive a plot size such as 0.07, convert it at once and keep the result in square metres for any further calculation.
Why not just use hectares?
A reader might ask why a conversion from acres should stop at square metres when hectares are the metric unit of land. The answer is scale. Below about two acres the square metre gives a number that is easy to read, and above ten acres the hectare does. Planning applications for houses, extensions and small commercial plots are written in square metres, while farm and forest sales are in hectares. A page that offers both lets you pick the scale that matches your document, and if you are unsure, convert twice: first with a “convert acres to m²” calculation to square metres, then divide by 10,000 to see the same area in hectares.
The feddan
Egypt measures farmland in feddans, each about 4,200 square metres, which is 1.038 acres. A smallholder with 3 feddans owns 12,600 m², or 3.1 acres. Agricultural statistics from Egypt are given in feddans, while American reports on the same crops, such as cotton or rice, use acres, and the square metre bridges the two.
The Chinese mu
One mu is 666.67 square metres, so an acre holds about 6.07 mu and a hectare 15 mu. Chinese farm yields are quoted in kilograms per mu. A harvest of 500 kg per mu equals 3,035 kg per acre, 7.5 tonnes per hectare, and the acre or the square metre can serve as the common step in between.
Trees per acre
Foresters plant about 400 to 700 trees per acre in commercial plantations, which is one tree for every 5.8 to 10.1 square metres. A Christmas tree farm with 1,500 trees per acre has one for every 2.7 m². Planting plans are built from the spacing between trees, so the square metres per tree give the same information as trees per acre.
Corn and wheat density
An American corn field is planted at about 32,000 plants per acre, which is 7.9 plants per square metre. Wheat is sown at 1.2 million seeds per acre, close to 300 seeds per square metre. Seed catalogues from different countries use these units, and a “convert acres to m²” calculation makes them comparable.
Rain on an acre
One inch of rain falling on an acre delivers 102.8 cubic metres of water, about 27,150 gallons. The same rain in millimetres is 25.4 litres on every square metre. A drought of a few inches over a county translates into millions of cubic metres, and the acre is the usual unit in American hydrology reports.
Berlin's Tiergarten
The Tiergarten has about 520 acres, 2.1 million m², making it larger than Monaco. Berlin published the area in hectares, 210, but English guides use acres. A tourist who walks the park's 3 km central axis will find it is only a part of a much larger green space, and a conversion explains the scale.
Rounding
The factor is a long decimal, 4,046.8564224. For everyday use 4,047 is accurate to within 0.003 per cent. For legal documents keep all the digits, and round the answer to whole square metres, or to the first decimal if your register asks for it.
More values for convert acres to m²
A longer list of conversions
If the value you need is not in the first list, these further conversions may be close enough to read off directly:
- 0.1 ac = 404.68564224 m²
- 0.5 ac = 2,023.4282112 m²
- 3 ac = 12,140.5692672 m²
- 4 ac = 16,187.4256896 m²
- 7 ac = 28,327.9949568 m²
- 15 ac = 60,702.846336 m²
- 20 ac = 80,937.128448 m²
- 75 ac = 303,514.23168 m²
- 200 ac = 809,371.28448 m²
- 500 ac = 2,023,428.2112 m²
- 2,000 ac = 8,093,712.8448 m²
- 10,000 ac = 40,468,564.224 m²
Mistakes when you convert acres to m²
Dividing instead of multiplying
The square metre is the smaller unit, so the number grows. If 3 acres became 0.00074, you used the wrong direction.
Confusing the acre with the are
The are is 100 square metres, the acre 4,047. An are is about 2.5 per cent of an acre.
Mixing linear and square metres
A plot 20 metres wide does not have an area of 20 m². Keep the units straight.
Quick answers
How many square metres in an acre?
4,046.86.
How do I convert acres to m²?
Multiply by 4,046.86.
How many acres in 10,000 m²?
About 2.471.
What is half an acre in square metres?
2,023.4 m².
Does my number leave my device?
No. The calculation runs in your browser.
Related pages and a last word
If you work with land and area, these conversions are close at hand: Convert acres to mi², Convert acres to ha, Convert mm² to m², Convert yd² to m², Convert m² to ares, Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C. The reverse of this page is Convert m² to acres.
In short, to convert acres to m² multiply by 4,046.86, remember that an acre is about four thousand square metres, and keep the digits your measurement supports. Your number stays on your device: nothing is uploaded and no account is needed.