Convert m² to acres square metres ↔ acres Free Online Secure
Type a value in square metres and read it in acres 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 m² to acres (square metres ↔ acres)
| m² | ac |
|---|---|
| 1 | 0.000247105381467 |
| 2 | 0.000494210762934 |
| 3 | 0.000741316144401 |
| 5 | 0.00123552690734 |
| 10 | 0.00247105381467 |
| 20 | 0.00494210762934 |
| 50 | 0.0123552690734 |
| 100 | 0.0247105381467 |
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
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 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.
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.
Buying a finca, a farmhouse or a vineyard: metres on the deed, acres in your head
Property sold in Spain, Italy, France or Portugal is described in square metres, hectares and sometimes in old local units. For a buyer from Britain, Ireland, North America or Australia, who thinks in acres, the first step is to convert m² to acres. You divide by 4,046.86, which means that 20,000 m² is 4.94 acres and 5,000 m² is 1.24. The calculation is simple, but it matters because land is priced by the unit and a slip changes the apparent price per acre by thousands. This page divides as you type, and the text below shows where the conversion matters, from Tuscan olive groves to Cypriot donums.
You will find the rule with worked examples, short profiles of both units, a comparison, a long tour of real situations and a list of the mistakes people make most often. The calculation runs in your browser and nothing you type is sent anywhere.
How to convert m² to acres: divide by 4,046.86
The rule
One acre equals exactly 4,046.8564224 square metres. To convert m² to acres, divide the square metres by 4,046.86, or multiply them by 0.000247105. So 4,047 m² is 1 acre, 10,000 m² is 2.471 acres, 20,234 m² is 5 acres and 40,469 m² is 10. To go the other way, multiply acres by 4,046.86.
Worked examples
A garden of 1,500 m² is 0.37 acre. A finca of 25,000 m² is 6.18 acres. An estate of 120,000 m² is 29.65 acres. For a quick estimate, divide by 4,000 and add 1 per cent: 40,000 m² gives 10, plus 0.1, which is 10.1, against 9.88 exactly.
From hectares
If the deed gives hectares, multiply by 2.471. So 3 ha is 7.41 acres, and 12.5 ha is 30.9 acres. Both routes agree, because a hectare is 10,000 m². Use whichever number the document gives you.
A quick check
The acre is the large unit, so the number must shrink by about four thousand times. If your “convert m² to acres” calculation produced a bigger number than the square metres you began with, you multiplied.
The square metre
The unit of the deed
The square metre is the area of a square one metre on a side. Land registers across continental Europe, Latin America and most of the world state plot sizes in square metres, and larger estates in hectares. A garden plot is a few hundred square metres, a finca several thousand.
Where it appears
Cadastral extracts, notarial deeds, estate agents' listings and building permits.
The acre
A day's ploughing
The acre is 4,046.86 m², 43,560 square feet, or 4,840 square yards. It began as the area a team of oxen could plough in a day. It remains the unit of rural land in the United Kingdom, Ireland, the United States, Canada, and parts of Australia and India.
Where it appears
Property listings, farm sales, planning applications, and agricultural statistics in English speaking countries.
Square metre and acre compared
An acre holds a little over four thousand square metres. A plot of 1,000 m² is about a quarter of an acre, and one of 2,000 m² is about half. The square metre suits house plots and gardens, the acre rural properties and fields.
Prices show the difference clearly. At 30 euros per square metre, land costs about 121,000 euros per acre. A British buyer who reads a price per square metre and thinks it per acre would be off by four orders of magnitude, which is why a conversion matters.
Where the conversion appears
Old European units in acres
A Greek stremma is 1,000 m², 0.247 acre. A Cypriot donum is 1,338 m², 0.33 acre. A Turkish dönüm is 1,000 m². A German Morgen was about 2,500 m², 0.62 acre, and a Hungarian hold 5,755 m², 1.42 acres. A Swedish tunnland is 4,936 m², 1.22 acres. These units appear in old deeds and family papers, and a “convert m² to acres” calculation is the last step after the first conversion to square metres.
Second homes in southern Europe
A Tuscan farmhouse with 3 hectares of land has 30,000 m², 7.4 acres. A Provence mas with 5,000 m² of grounds has 1.24 acres. A villa plot on the Algarve of 1,200 m² has 0.3 acre. Agents abroad often quote square metres for the plot and for the house, so a buyer has to separate the two figures.
Olive groves and vineyards
An olive grove of 10,000 m², 2.47 acres, may hold 100 to 200 trees, 40 to 80 per acre. A small vineyard of 5,000 m², 1.24 acres, can have 2,000 vines. Producers describe the land in square metres or hectares, and foreign buyers want acres to compare with Napa or Barossa.
Horse properties
The rule of thumb for a horse is one to two acres of pasture, 4,047 to 8,094 m². A stable yard with four horses needs 8 acres, 32,375 m², of grass. Sellers in Europe give the area in square metres, and riders from Britain or America convert to see if there is enough pasture.
Wine estates and vineyards
A Tuscan wine estate of 25 ha, 250,000 m², 61.8 acres, may produce 100,000 bottles a year. A small Napa vineyard of 10 acres, 40,469 m², might yield 40 tonnes of grapes. Producers measure land in hectares in Europe and acres in America, so an estate sale advertised internationally mentions both.
Camping and glamping sites
A campsite of 20,000 m², 4.94 acres, can host 100 pitches. A glamping site of 5 acres, 20,234 m², might hold 20 tents with generous space between them. Tourism developers use square metres for the layout and acres when they talk to investors from English speaking countries.
Rounding
The factor 4,046.86 is exact. For plots over 1,000 m², give two decimals in acres, and for smaller ones three or four. A result of 0.2471 for 1,000 m² can be rounded to 0.25 in conversation, but keep the exact figure in documents.
Spreadsheet use
Write square metres in column A and =A2/4046.8564224 in column B. For the reverse, use =B2*4046.8564224. Format with two decimals. Add a total row and compare it with the sum on the deed.
Teaching the idea
Mark a square of 63.6 metres on a field and call it an acre. Students pace it out and find about 85 paces on each side. Then ask how many such squares fit in a plot of 20,000 m². The answer, 4.94, makes the factor concrete.
Aerial photos and maps
On a satellite image, a plot of 4,047 m² looks like a square of 64 metres, about the size of a tennis court and a half on each side. Real estate sites mark plot boundaries and give the area in the unit of the country. A “convert m² to acres” calculation lets you check that the figure matches the drawn area.
Fencing and boundary costs
A square plot of one acre has a perimeter of 254 metres. A plot of 20,000 m², 4.94 acres, has about 566 metres if square. Fencing contractors quote by the metre, and the plot area gives an estimate of the length needed. A longer, thinner plot costs more to fence.
Water, wells and irrigation
A garden of 2,000 m², 0.49 acre, needs about 10 cubic metres of water per week in summer, 5 litres per square metre. A farm of 4 acres, 16,187 m², needs 80 cubic metres. Well permits and water rights use cubic metres, while land is described in acres or square metres.
Why the factor is so odd
The acre is defined by the old furlong and chain, 660 by 66 feet, and the metre is defined by light. The ratio between them, 4,046.86, comes from the foot, which is 0.3048 m. Square the foot, multiply by 43,560 square feet in an acre, and you arrive at the factor. Nothing about it is round, but it is exact.
Barns, stables and outbuildings
A barn of 400 m² on a plot of 20,000 m² uses 2 per cent of the land. In acres, the barn sits on 0.1 of a 4.94 acre plot. Property descriptions in Britain and Ireland often list outbuildings in square metres or feet, and the land in acres, so each figure needs its own conversion, and a “convert m² to acres” calculation is only one of the steps.
The Greek stremma and island land
Land on Greek islands is sold in stremmata, each of 1,000 m². A plot of 4 stremmata is 4,000 m², 0.99 acre. A plot of 10 stremmata is 10,000 m², 2.47 acres. The tradition survives in listings in English, which usually give both stremmata and square metres, but not always acres, so you need a “convert m² to acres” calculation to see what you are looking at.
Plots for self builders
A self builder looking for a plot of 600 to 1,000 m², 0.15 to 0.25 acre, will find sites in Ireland and Britain described in acres or fractions of an acre. A plot of 0.3 acre is 1,214 m². Planning officers in the United Kingdom speak of hectares in policies and acres in conversation, so you hear both.
Cemeteries, parks and playing fields
A village playing field of 15,000 m², 3.7 acres, may host a football pitch and a cricket square. A small public park of 2 acres, 8,094 m², is a minor open space in planning terms. Councils report their open spaces in hectares, while communities and charities describe them in acres, and the conversion keeps the discussion exact.
Smallholdings and allotment sites
A smallholding of 4 hectares, 40,000 m², 9.9 acres, can support a few cattle and a market garden. An allotment site of 8,000 m², 1.98 acres, may hold 30 plots of 250 m². Sellers in different countries state the area in different units, and a “convert m² to acres” calculation makes the offers comparable.
Hotels, golf and leisure development
A resort with a golf course, hotel and villas on 60 hectares has 600,000 m², 148 acres. A boutique hotel on 2 hectares has 20,000 m², 4.94 acres. Investors from the United States consider the acre a standard measure of development potential, and ask for it even if the documents give hectares.
Reading a deed carefully
A deed may state the area in several ways: a total in square metres, a breakdown by parcel, and an approximate figure in hectares. They should agree, but they do not always. Convert the total and each parcel separately, add the parcels, and compare the sum with the total. If the difference exceeds half a per cent, ask the notary to explain it. A “convert m² to acres” calculation done twice, by two routes, is a cheap precaution against costly misunderstandings before a purchase is signed.
Choosing the right level of detail
For a first look at a property, one decimal in acres is enough: 5,300 m² is 1.3 acres. For comparing prices, two decimals help: 5,300 m² is 1.31 acres. For legal work, keep the metric figure from the register and add the acre figure only as a courtesy. That way nobody will argue over a rounded number, and the deed remains the authoritative source for the area.
Cyprus and the donum
Cypriot land is measured in donums, each of 1,338 m², a third of an acre. An old plot of 3 donums is 4,014 m², 0.99 acre. A hotel site of 30 donums is 40,140 m², 9.9 acres. British expatriates know the donum and the acre, and a conversion from square metres links the two.
Rural Australia and New Zealand
A lifestyle block in New Zealand is 4,000 m² to 4 hectares, 1 to 10 acres. A rural residential lot in Australia may be 2 hectares, 4.94 acres. Listings use hectares and sometimes acres. A buyer from the United Kingdom can use a “convert m² to acres” calculation on the hectare figure to see the size in familiar terms.
Garden sizes in Britain
An average new British garden is 150 m², 0.037 acre. A large Victorian villa may have 2,000 m², 0.49 acre. A country house with grounds of 8,000 m², two acres, is considered a sizable property. Real estate sites in Britain use acres for large plots and square metres for small ones.
Chateau grounds in France
A small chateau might have 5 hectares, 50,000 m², 12.4 acres, of park and woodland. Larger estates have 20 hectares, 200,000 m², 49.4 acres. Listings from French agents give hectares, and foreign buyers often convert straight to acres.
Building plots and permitted density
A plot of 800 m², 0.2 acre, with a permitted density of 20 per cent allows a footprint of 160 m². A plot of 2,000 m², 0.49 acre, allows 400 m². Local rules in Europe state coverage in per cent of plot area, while American rules may use floor area ratio or lot coverage. Plot size is the starting point in each case.
Agricultural land prices
Farmland at 8,000 euros per hectare is 0.8 euro per square metre and 3,237 euros per acre. At 30,000 euros per hectare it is 3 euros per square metre and 12,140 per acre. Comparing prices across countries requires converting the area and the currency, and the first step is the area.
Forestry blocks
A forest block of 100,000 m², 10 ha, 24.7 acres, may yield 3,000 cubic metres of timber at maturity. Forestry investors compare blocks by yield per hectare or per acre. The conversion from square metres to acres is the preliminary step before any analysis.
More values for convert m² to acres
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 m² = 0.0000247105 ac
- 0.5 m² = 0.000123553 ac
- 3 m² = 0.000741316 ac
- 4 m² = 0.000988422 ac
- 7 m² = 0.00172974 ac
- 15 m² = 0.00370658 ac
- 20 m² = 0.00494211 ac
- 75 m² = 0.0185329 ac
- 200 m² = 0.0494211 ac
- 500 m² = 0.123553 ac
- 2,000 m² = 0.494211 ac
- 10,000 m² = 2.47105 ac
Mistakes when you convert m² to acres
Multiplying instead of dividing
The acre is the bigger unit, so the number shrinks. If 10,000 m² became 40,468,600, you multiplied.
Confusing the acre with the are
The are is 100 m². An acre is about 40 ares.
Dropping a digit
The factor has four digits before the point, 4,046. Dropping one changes the answer tenfold.
Quick answers
How many acres in a square metre?
0.000247.
How do I convert m² to acres?
Divide by 4,046.86.
How many square metres in an acre?
4,046.86.
What is 10,000 m² in acres?
2.471 acres.
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 m² to cm², Convert m² to ha, Convert ha to acres, Convert mi² to acres, Convert acres to ha, Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C. The reverse of this page is Convert acres to m².
In short, to convert m² to acres divide by 4,046.86, remember that a hectare is 2.47 acres, and keep the digits your source supports. Your number stays on your device: nothing is uploaded and no account is needed.