Convert acres to ft² acres ↔ square feet Free Online Secure
Type a value in acres and read it in square feet 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 ft² (acres ↔ square feet)
| ac | ft² |
|---|---|
| 1 | 43560 |
| 2 | 87120 |
| 3 | 130680 |
| 5 | 217800 |
| 10 | 435600 |
| 20 | 871200 |
| 50 | 2178000 |
| 100 | 4356000 |
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 do I think about square feet?
A square foot is 0.09290304 square metres exactly, so a square metre is about 10.76 square feet. In the United States and in British property listings, floor space is given in square feet: a 100 square metre flat is a little under 1,100 square feet. Divide by ten and a bit to go from feet to metres.
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.
One acre is 43,560 square feet: a number worth knowing
Real estate in the United States is a conversation between two units. The lot is described in acres, the house in square feet, and the buyer wants to know how much of the land the building takes up. To convert acres to ft², multiply the acres by 43,560. A quarter acre is therefore 10,890 ft², and a tenth of an acre is 4,356 ft². The factor is exact, so the only real risk is slipping a digit when you copy it. This page multiplies as you type, and the text below tells you what the numbers mean on the ground, from suburban lots to the Pentagon.
You will find the rule with worked examples, short profiles of the acre and the square foot, a comparison, a tour of real situations, and a list of the mistakes that people make most often with area units. The calculation runs entirely in your browser, and nothing you type is sent anywhere.
How to convert acres to ft²: multiply by 43,560
The rule
One acre equals exactly 43,560 square feet. To convert acres to ft², multiply the number of acres by 43,560. Two acres are 87,120 ft², five acres are 217,800 ft², and a hundred acres are 4,356,000 ft². To go the other way, divide square feet by 43,560.
Worked examples
A lot of 0.25 acre is 10,890 ft². A lot of 0.6 acre is 26,136 ft². A field of 12.5 acres is 544,500 ft². For a rough check, round the factor to 43,500: half an acre comes out near 21,750, and the exact answer, 21,780, is only 0.14 per cent higher.
Why the factor looks odd
The number 43,560 is 660 by 66, the furlong by the chain, the old shape of an acre. It is not a round number because the acre was never designed for decimal arithmetic. It was designed for ploughing, and the square foot came much later as a convenient unit of floor space.
A quick check
The square foot is tiny compared with an acre, so the answer should be a large number with five or more digits. If your “convert acres to ft²” calculation gave you a number smaller than the acres you started with, you divided instead of multiplying.
The acre
A furlong by a chain
The acre is 4,046.86 square metres. The English statute of 1593 fixed the mile at 5,280 feet, which in turn fixed the furlong at 660 feet, and the acre became the area of a furlong by a chain of 66 feet. Land deeds, farm sales and property taxes in the United States, Britain and Ireland still use it.
A sense of scale
A square acre would be about 208.7 feet on each side, roughly the size of a football field without the end zones. A typical suburban lot is a quarter or a third of that.
The square foot
A square twelve inches on a side
The square foot is 144 square inches, or 0.092903 square metres. It measures floor area, room sizes, house sizes and commercial rents in North America and in some other countries. A flat advertised at 750 ft² is about 70 m².
Where you meet it
Estate agents, builders, flooring shops and architects use it daily. Prices for flooring, tiles and rent are quoted per square foot in the United States.
Acre and square foot compared
The acre is for land and the square foot for buildings and rooms. The ratio between them is large, 43,560, so a house of 2,400 ft² on a lot of one acre covers about 5.5 per cent of the land. That kind of proportion is exactly what planners and buyers check when they look at coverage rules.
Because the two units describe things at different scales, they are rarely used in the same sentence unless somebody is comparing a building to its plot. When they are, convert the larger to the smaller or the other way round, never mix them.
Where the conversion appears
House and lot
A listing might say a house of 2,400 ft² on 0.46 acre. The lot is 20,038 ft², so the building footprint, if the house has two floors, is about 1,200 ft², or six per cent of the plot. Agents show the lot in acres because the number is short, but zoning rules are often in square feet.
Retail and parking
A supercentre of about 180,000 ft² is 4.1 acres of floor space, and its parking lot may cover three times as much land. A shopping centre developer thinks in both units, because rent is per square foot and land cost per acre.
Public buildings
The Pentagon occupies 29 acres, which is 1.26 million ft². The grounds of the White House cover about 18 acres, or 784,080 ft². Buckingham Palace garden has 39 acres, 1.7 million ft². Large numbers like these are easier to picture in acres.
Zoning minimums
Many American suburbs require a minimum lot size such as half an acre, which is 21,780 ft², or one acre, 43,560 ft². A builder who wants to divide ten acres into half acre lots can create 20, before roads and open space are subtracted. Roads and drainage typically take 15 to 25 per cent, so the real number is nearer 15, and the arithmetic of a “convert acres to ft²” calculation shows the difference clearly.
Lawn, mulch and fertiliser coverage
Bags of lawn seed, fertiliser and mulch state coverage in square feet. A bag that covers 5,000 ft² treats 0.115 acre, so an acre needs 8.7 bags. To convert acres to ft² before shopping is a good habit, because garden stores round their coverage figures generously.
Solar installations
A rooftop system of 400 ft² covers 0.009 acre. A ground mounted array of 10 acres has 435,600 ft² of land, but the panels themselves cover about a third of it. Installers describe the site in acres and the panels in square feet, and comparing the two shows how efficiently the land is used.
Reading architectural drawings
Site plans give the lot area in acres or square feet, building footprints in square feet and floor areas in gross square feet. An architect checking the floor area ratio divides gross floor area by lot area in the same unit. A building of 87,120 ft² on a lot of one acre has a ratio of 2. The area of the lot comes from a “convert acres to ft²” calculation, which is why architects keep the converter at hand.
Spreadsheet use
Write acres in column A and =A2*43560 in column B. Format the result without decimals, and add a column for the reverse, =B2/43560, as a check. If you calculate from square feet, remember that the answer will have many decimals in acres, so round to two or three.
Rounding
For most purposes the factor 43,560 is exact, so no rounding is needed until the end. If your measurement came from a map, round the result to the number of digits the measurement supports. A lot measured as 0.25 acre should not be reported as 10,890.0 ft², but as about 10,900, however carefully you convert acres to ft².
Teaching the idea
Ask students to mark a square of 10 by 10 feet, which is 100 ft², and imagine 435.6 of them. Then mark a stride length square of 208.7 feet on the playground. The contrast between 100 and 43,560 makes the factor memorable and shows that large area units are built from small ones.
Old deeds and the rood
An old British deed may describe land in roods and perches. A rood is a quarter acre, 10,890 ft², and a perch is a 160th of an acre, 272.25 ft². To convert acres to ft² from an old deed, change roods and perches into acres first, then multiply by 43,560.
Garages, driveways and parking
One parking space is about 9 by 18 feet, 162 ft², and with its share of the aisle roughly 300 to 350 ft². An acre of parking therefore holds around 125 to 145 cars once lanes and landscaping are included. Developers use the rule of thumb to decide how much land a store or an office needs, and they convert it again when a municipality states its limits in acres. A “convert acres to ft²” calculation done at the start of the plan saves a redesign later.
Farm buildings and barns
A dairy barn of 20,000 ft² takes up 0.46 acre. A grain bin of 40 feet diameter has a footprint of 1,257 ft², under three hundredths of an acre. Farm plans show buildings in square feet and fields in acres, and a farmer who wants to know how much land is lost to buildings divides the first by 43,560 to find the share in acres.
Schools and playgrounds
School guidelines in some states recommend 10 acres for an elementary school and 30 for a high school, which is 435,600 and 1,306,800 ft². A playground of 15,000 ft² is 0.34 acre. Planners combine all the parts, buildings, parking, fields and play areas, and compare the total with the size of the site they have been offered.
American football fields
The field including both end zones measures 360 by 160 feet, which is 57,600 ft² or 1.32 acres. So one acre is about three quarters of a football field, and a ten acre site is about 7.6 fields. Sports writers use this comparison all the time because American readers know the size of a field by sight.
Golf and driving ranges
A driving range may cover 15 acres, or 653,400 ft², to give players room for 250 yard shots with a safety margin. A putting green of 5,000 ft² is 0.115 acre. Golf architects talk about acres for the course and square feet for greens and tees, and they convert whenever a green has to be compared with a field.
Greenhouses and nurseries
A greenhouse of 30 by 96 feet has 2,880 ft², or 0.066 acre. A nursery with 40 such houses covers 2.6 acres of glass, plus the working yard and packing sheds. Growers pay heating bills by the square foot of glass and rent for land by the acre, so a conversion links the two budgets.
A history of the square foot
Floor area became a standard measure with the rise of the skyscraper and the office rental market in the late nineteenth century. New York brokers priced space per square foot, and the practice spread through the English speaking world. Land, by contrast, kept its old unit, the acre, which is why a US listing often shows both numbers side by side.
Tennis and basketball courts
A tennis court of 78 by 36 feet is 2,808 ft², which is 0.0645 acre, so an acre holds about 15 courts. A basketball court of 94 by 50 feet is 4,700 ft², 0.108 acre. A school that wants a sports area of half an acre has 21,780 ft², enough for four tennis courts with fencing and a path.
New homes and lot coverage
The average new American house is about 2,400 ft². On a lot of one third of an acre, 14,520 ft², that is 16.5 per cent of the land. Many towns limit coverage to 25 or 30 per cent, which on that lot is 3,630 to 4,356 ft² of building footprint, driveways and patios together. A “convert acres to ft²” calculation gives you the lot area to apply the percentage to.
Price per square foot and per acre
A land price of 1 dollar per square foot equals 43,560 dollars per acre. A price of 5 dollars per square foot is 217,800 dollars per acre. Agents quote land per acre in rural areas and per square foot in cities, so an investor comparing offers must convert before deciding which one is cheaper.
Cemetery plots
A single grave plot is typically 4 by 10 feet, which is 40 ft². An acre holds 1,089 such plots in theory, and about 800 to 1,000 once paths, roads and landscaping are included. Cemetery designers use the figure to plan how many years of burials a given piece of land can serve.
The survey acre and the international acre
For many decades the United States had two feet: the international foot and the survey foot, which differ by two parts per million. The survey acre was therefore 43,560.17 ft², 0.17 ft² larger than the international acre. The old survey foot was retired in 2023, so new work uses 43,560 exactly.
Frontage and depth
A lot with 100 feet of frontage needs a depth of 435.6 feet to make one acre. A lot of 150 by 290 feet is 43,500 ft², close to an acre, and one of 200 by 217.8 feet is exactly one. Deeds list frontage and depth, so a buyer can use the multiplication to check whether the stated acreage is right.
Pacing out an acre
A square acre has sides of 208.71 feet. A walker with a stride of 2.5 feet takes about 83 paces along each side. Pace out a square of that size in a field and you will see how modest an acre is, and how much larger the tenth of a square mile on a map really feels.
More values for convert acres to ft²
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 = 4,356 ft²
- 0.5 ac = 21,780 ft²
- 3 ac = 130,680 ft²
- 4 ac = 174,240 ft²
- 7 ac = 304,920 ft²
- 15 ac = 653,400 ft²
- 20 ac = 871,200 ft²
- 75 ac = 3,267,000 ft²
- 200 ac = 8,712,000 ft²
- 500 ac = 21,780,000 ft²
- 2,000 ac = 87,120,000 ft²
- 10,000 ac = 435,600,000 ft²
Mistakes when you convert acres to ft²
Dividing instead of multiplying
The square foot is the smaller unit, so the number grows. If 2 acres turned into 0.0000459, you used the wrong direction.
Mixing linear and square feet
A lot 100 feet wide is not 100 square feet. Make sure you work with area units, not lengths.
Forgetting the digits
The factor has five digits, 43,560, and writing 4,356 or 435,600 changes the answer tenfold.
Quick answers
How many square feet in an acre?
43,560.
How do I convert acres to ft²?
Multiply by 43,560.
How many acres is 10,000 ft²?
About 0.2296 acre.
What is half an acre in square feet?
21,780 ft².
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 m², Convert m² to ft², Convert yd² to ft², Convert ft² to m², Convert km to mi, Convert mi to km, Convert °C to °F, Convert °F to °C. The reverse of this page is Convert ft² to acres.
In short, to convert acres to ft² multiply by 43,560, remember that a quarter acre is 10,890 ft², and keep the digits your measurement supports. Your number stays on your device: nothing is uploaded and no account is needed.