How many square feet are in an acre?

43,560 square feet per international acre. Choose Known area, enter 43,560 and select sq ft for one acre, or enter 1 and select acres for the reverse conversion. A measured 660 by 660 foot rectangle has 435,600 square feet, or 10 acres.

How do I work out acreage from length and width?

For a rectangle, multiply length by width in feet, then divide by 43,560. A 200 by 150 foot rectangle has 30,000 square feet, about 0.689 acres. This page accepts feet-and-inches and explicit metric lengths. The ft/m switch sets the meaning of bare numbers; written units override it.

What if the land is not a rectangle?

Add measured non-overlapping supported pieces, using perpendicular heights for triangles and trapezoids. Four or five side lengths alone cannot determine an arbitrary polygon. Approximating a curved boundary with straight pieces is only an approximation and requires suitable additional measurements. This tool has no map, GPS, address, blueprint or legal-boundary lookup.

How many hectares is an acre?

One international acre is 0.40468564224 hectares, about 0.405 ha. A hectare is 10,000 square metres. Enter a known number of hectares or acres to convert directly; the displayed results are rounded.

Is this the survey acre or the international acre?

This page uses the international foot, exactly 0.3048 metres. An international acre is 43,560 international square feet. A historical US survey acre uses the longer US survey foot and differs by about four parts per million; that distinction can matter in survey records. Do not use these rounded conversions to reinterpret a recorded survey area.

Can I put a price on the land?

You can multiply area by a supplied price per square foot. The total is rounded to cents and excludes fees, tax, labour and closing costs. A price per acre divided by 43,560 is the equivalent price per international square foot. This is supplied-rate arithmetic, not a market valuation, loan estimate or rent allocation.

Acreage Calculator

Calculate acres from measured dimensions, or choose Known area to convert an existing area directly. One international acre is 43,560 square feet. The page puts acres first and also shows square feet, square metres, square yards and hectares. For supported irregular land, add measured non-overlapping rectangles, triangles or trapezoids; dimensions and perpendicular heights must describe those shapes.

Acreage · Rectangle · length × width--acresType the sides to start: 12' 6", 12 ft 6 in, 12.5 or 3.8 m

Calculate from

Shape

Length

Width

Unit

Name

Cost per sq ft

Known area converts square feet, square inches, square metres, square yards, acres or hectares. In Shapes mode, type each side the way you measured it: 12' 6", 12'-6", 12 ft 6 in or 12.5 in feet; 3.4 or 340 cm in metres. The ft/m switch sets the meaning of bare numbers, so changing it reinterprets those numbers. A written unit always wins over the switch. The total counts the shape above plus every room in the list, so a single room never needs adding; Add room moves it to the list and clears the sides for the next one.

Land is a list of shapes. Split measured land into non-overlapping supported shapes. Four or five side lengths alone do not determine an arbitrary lot’s area; no map, address lookup or survey boundary is inferred. Shape formulae use browser-number arithmetic and rounded displays, with the international foot (0.3048 m) and acre (43,560 square feet). Enter measured perpendicular heights and non-overlapping pieces; this does not determine legal property area.

Common questions

How many square feet are in an acre?: 43,560 square feet per international acre. Choose Known area, enter 43,560 and select sq ft for one acre, or enter 1 and select acres for the reverse conversion. A measured 660 by 660 foot rectangle has 435,600 square feet, or 10 acres.
How do I work out acreage from length and width?: For a rectangle, multiply length by width in feet, then divide by 43,560. A 200 by 150 foot rectangle has 30,000 square feet, about 0.689 acres. This page accepts feet-and-inches and explicit metric lengths. The ft/m switch sets the meaning of bare numbers; written units override it.
What if the land is not a rectangle?: Add measured non-overlapping supported pieces, using perpendicular heights for triangles and trapezoids. Four or five side lengths alone cannot determine an arbitrary polygon. Approximating a curved boundary with straight pieces is only an approximation and requires suitable additional measurements. This tool has no map, GPS, address, blueprint or legal-boundary lookup.
How many hectares is an acre?: One international acre is 0.40468564224 hectares, about 0.405 ha. A hectare is 10,000 square metres. Enter a known number of hectares or acres to convert directly; the displayed results are rounded.
Is this the survey acre or the international acre?: This page uses the international foot, exactly 0.3048 metres. An international acre is 43,560 international square feet. A historical US survey acre uses the longer US survey foot and differs by about four parts per million; that distinction can matter in survey records. Do not use these rounded conversions to reinterpret a recorded survey area.
Can I put a price on the land?: You can multiply area by a supplied price per square foot. The total is rounded to cents and excludes fees, tax, labour and closing costs. A price per acre divided by 43,560 is the equivalent price per international square foot. This is supplied-rate arithmetic, not a market valuation, loan estimate or rent allocation.

Shape formulae use browser-number arithmetic and rounded displays, with the international foot (0.3048 m) and acre (43,560 square feet). Enter measured perpendicular heights and non-overlapping pieces; this does not determine legal property area.