How many square feet are in an acre?

43,560, exactly. The same acre is 4,840 square yards, 4,046.8564224 square metres and 0.40468564224 hectares, and all four of those figures are on the page at once: type 43,560 in the From box and the headline reads 1 acre with nothing after the decimal point, with the square yard, square metre and hectare rows underneath it.

How do I convert square feet to acres?

Divide by 43,560. A 10,000 square foot lot is 0.229568411387 acres, 5,000 square feet is 0.114784205693 acres, and 100 square feet is 0.00229568411387 acres. Going the other way multiplies by the same number, so 0.25 acres is 10,890 square feet. The swap button between the two boxes flips the pair when you want to type acres instead.

Is an acre exactly 43,560 square feet?

Yes, because both units are defined in metres. An acre is exactly 4,046.8564224 m² and a square foot is exactly 0.09290304 m², and the first divides by the second exactly 43,560 times. This converter stores those two definitions rather than a rounded ratio, so 43,560 square feet comes back as 1 acre and 87,120 as 2, not as 0.99999.

How big is a quarter acre in square feet?

10,890 square feet. Half an acre is 21,780, an eighth is 5,445 and a tenth is 4,356. To read one here, press the swap button so that acres is the From unit and type 0.25: the headline shows 10,890 square feet, and the rows under it give the same plot as 1,011.7141056 square metres and 1,210 square yards.

My lot is 150 by 200 feet. How many acres is that?

For a rectangle with supplied perpendicular sides of 150 and 200 international feet, area = 150 × 200 = 30,000 ft², displaying as 0.68870523416 acres. Two dimensions alone do not determine an irregular lot. Unit Converter takes a supplied area scalar. Square Footage Calculator supplies rectangular length × width and added-area arithmetic; Area Calculator supports its listed geometric formulas. Neither measures a boundary or certifies a property area.

Why is one square foot shown as 0.0000229568411387 acres?

Because an acre is a large unit and one square foot is one 43,560th of it. Results are printed to twelve significant digits with trailing zeros dropped, which is why the exact cases stay clean and everyday lot sizes keep their decimals. Areas smaller than about a millionth of the target unit switch to exponential notation instead, so a single square inch reads 1.59422507907e-7 acres.

Can I convert acres to hectares on this page?

Yes. Hectares are one of the units listed under the result, so an acre reads 0.40468564224 hectares, and choosing Hectare in either box makes it the headline instead. Going the other way, one hectare is 2.47105381467 acres. Square millimetres are the only area unit hidden by default, behind the Show 1 more switch in the readout, while both menus always include it.

Is my lot size sent anywhere?

Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account. This focused page opens on Square foot (ft²) to Acre (ac), while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units. The selected Square foot uses the international foot of exactly 0.3048 m. Confirm that convention in the source; a US survey-foot area is a different quantity and has no menu entry here.

Square Feet to Acres

Divide square feet by 43,560 and you have acres, using the international foot and acre, because an acre is exactly 43,560 square feet: 10,000 sq ft is 0.229568411387 acres, and 21,780 sq ft is half an acre exactly. The converter above opens with Square foot in the From box and Acre in the To box whatever you converted last, and it prints the answer to twelve significant digits. Under the result the same plot is listed in square metres, hectares, square yards, square miles, square inches, square centimetres and square kilometres at once, which is the part most square feet to acres pages leave out: a lot quoted in acres usually has to be repeated in square metres or hectares an hour later. The swap button between the two boxes turns the page into an acres to square feet converter without reloading it, and the chart at the foot of the page runs from 1,000 square feet to a million.

From

To0.0000229568411387

Category: Area

Base unit: square meter

Uncommon units: Show 1 more

Foot-based areas use the international foot: one acre is 4,046.8564224 square meters. Historical US survey-foot areas require a different convention.

Results round to 12 significant digits using the listed unit definitions. Input must have a finite numeric magnitude and at most 512 significant digits. Type a single decimal or scientific number; a matching From unit suffix is accepted. Commas and grouped spaces separate thousands; decimal commas, fractions and compound measurements are refused.

1 ft² in every area unit

Square centimetercm²
929.0304
Square meterm²
0.09290304
Hectareha
0.000009290304
Square kilometerkm²
9.290304e-8
Square inchin²
144
Square yardyd²
0.111111111111
Acreac
0.0000229568411387
Square milemi²
3.58700642792e-8

Selectable complete conversion

Unit Converter — Area
Input: 1 (Square foot, ft²)
Result: 0.0000229568411387 ac (Acre)
Displayed values round to 12 significant digits.
Foot-based areas use the international foot: one acre is 4,046.8564224 square meters. Historical US survey-foot areas require a different convention.
All other units:
Square millimeter (mm²): 92903.04
Square centimeter (cm²): 929.0304
Square meter (m²): 0.09290304
Hectare (ha): 0.000009290304
Square kilometer (km²): 9.290304e-8
Square inch (in²): 144
Square yard (yd²): 0.111111111111
Acre (ac): 0.0000229568411387
Square mile (mi²): 3.58700642792e-8

Square feet to acres, square metres and square yards

Every figure is this converter's own output for that number of square feet, printed the way the page prints it. The 5,445, 10,890, 21,780 and 43,560 rows are an eighth, a quarter, a half and a whole acre exactly, which is why they end there.

Square feet	Acres	Square metres	Square yards
1,000	0.0229568411387	92.90304	111.111111111
2,500	0.0573921028466	232.2576	277.777777778
5,000	0.114784205693	464.5152	555.555555556
5,445	0.125	505.8570528	605
7,500	0.17217630854	696.7728	833.333333333
10,000	0.229568411387	929.0304	1,111.11111111
10,890	0.25	1,011.7141056	1,210
15,000	0.34435261708	1,393.5456	1,666.66666667
20,000	0.459136822773	1,858.0608	2,222.22222222
21,780	0.5	2,023.4282112	2,420
25,000	0.573921028466	2,322.576	2,777.77777778
30,000	0.68870523416	2,787.0912	3,333.33333333
40,000	0.918273645546	3,716.1216	4,444.44444444
43,560	1	4,046.8564224	4,840
50,000	1.14784205693	4,645.152	5,555.55555556
87,120	2	8,093.7128448	9,680
100,000	2.29568411387	9,290.304	11,111.1111111
217,800	5	20,234.282112	24,200
435,600	10	40,468.564224	48,400
1,000,000	22.9568411387	92,903.04	111,111.111111

Common questions

How many square feet are in an acre?: 43,560, exactly. The same acre is 4,840 square yards, 4,046.8564224 square metres and 0.40468564224 hectares, and all four of those figures are on the page at once: type 43,560 in the From box and the headline reads 1 acre with nothing after the decimal point, with the square yard, square metre and hectare rows underneath it.
How do I convert square feet to acres?: Divide by 43,560. A 10,000 square foot lot is 0.229568411387 acres, 5,000 square feet is 0.114784205693 acres, and 100 square feet is 0.00229568411387 acres. Going the other way multiplies by the same number, so 0.25 acres is 10,890 square feet. The swap button between the two boxes flips the pair when you want to type acres instead.
Is an acre exactly 43,560 square feet?: Yes, because both units are defined in metres. An acre is exactly 4,046.8564224 m² and a square foot is exactly 0.09290304 m², and the first divides by the second exactly 43,560 times. This converter stores those two definitions rather than a rounded ratio, so 43,560 square feet comes back as 1 acre and 87,120 as 2, not as 0.99999.
How big is a quarter acre in square feet?: 10,890 square feet. Half an acre is 21,780, an eighth is 5,445 and a tenth is 4,356. To read one here, press the swap button so that acres is the From unit and type 0.25: the headline shows 10,890 square feet, and the rows under it give the same plot as 1,011.7141056 square metres and 1,210 square yards.
My lot is 150 by 200 feet. How many acres is that?: For a rectangle with supplied perpendicular sides of 150 and 200 international feet, area = 150 × 200 = 30,000 ft², displaying as 0.68870523416 acres. Two dimensions alone do not determine an irregular lot. Unit Converter takes a supplied area scalar. Square Footage Calculator supplies rectangular length × width and added-area arithmetic; Area Calculator supports its listed geometric formulas. Neither measures a boundary or certifies a property area.
Why is one square foot shown as 0.0000229568411387 acres?: Because an acre is a large unit and one square foot is one 43,560th of it. Results are printed to twelve significant digits with trailing zeros dropped, which is why the exact cases stay clean and everyday lot sizes keep their decimals. Areas smaller than about a millionth of the target unit switch to exponential notation instead, so a single square inch reads 1.59422507907e-7 acres.
Can I convert acres to hectares on this page?: Yes. Hectares are one of the units listed under the result, so an acre reads 0.40468564224 hectares, and choosing Hectare in either box makes it the headline instead. Going the other way, one hectare is 2.47105381467 acres. Square millimetres are the only area unit hidden by default, behind the Show 1 more switch in the readout, while both menus always include it.
Is my lot size sent anywhere?: Your input and converted values are calculated in the browser and are not uploaded by the converter. The definitions arrive with the page, so conversion needs no external data lookup and keeps working offline after the page has loaded. The core conversion needs no account. This focused page opens on Square foot (ft²) to Acre (ac), while preserving the main converter’s saved unit pair. When storage is usable, a saved value and uncommon-unit preference can travel between pages. Its suffix must still match From. Valid deliberate scalar edits can save those fields after a short delay; invalid or incomplete drafts preserve the saved record. Unusable or conflicting records remain until you use Forget saved settings, which keeps the current conversion on screen. Copy result copies the displayed headline without digit-grouping commas; each visible conversion row has its own Copy button. Displayed and copied values round to twelve significant digits. If native copying fails, a complete selectable summary identifies the input, selected pair and conventions and includes every unit in the category, including uncommon units. The selected Square foot uses the international foot of exactly 0.3048 m. Confirm that convention in the source; a US survey-foot area is a different quantity and has no menu entry here.

Results round to 12 significant digits using the listed unit conventions. Many factors are exact definitions; psi and parsec use rounded coefficients. Temperature includes scale offsets. Days and weeks are fixed-duration units, and unit conversion does not determine calendar dates, ambient pressure or a software label’s convention.