Acreage Calculator — Land Area in Acres
Enter the dimensions of your land plot (rectangle, triangle or circle) in feet, meters or yards and instantly get the area in acres plus a full unit breakdown.
Shape
Input unit
ft
ft
1 acre = 43,560 sq ft = 4,046.86 sq m
- 1
Area in square feet
200 × 100 = 20,000 ft² - 2
Acres
20,000 ÷ 43,560 = 0.45911 acre = 43,560 sq ft exactly.
How does this calculator work?
Acreage = (area in sq ft) ÷ 43,560. For a rectangle multiply length × width; for a triangle multiply ½ × base × height; for a circle use π × radius². Convert the result to acres, hectares, or square meters. One acre equals 43,560 sq ft or 4,046.86 sq m.
Formula
How this is calculated
An acre is a unit of land area equal to exactly 43,560 square feet, 4,046.856 square meters, or 0.404686 hectares. It originates from the area a team of oxen could plough in a day and remains the standard measurement for farmland, real-estate lots, and survey descriptions in the United States and the United Kingdom.
The calculator first converts the input dimensions to feet (1 m = 3.28084 ft; 1 yd = 3 ft), then computes the area in square feet using the appropriate formula for the selected shape — length × width for a rectangle or square, ½ × base × height for a triangle, or π × (diameter/2)² for a circle. That square-footage is divided by 43,560 to give acres, and the same base square-footage is multiplied by the relevant conversion factors to give square meters, hectares, square yards, and square miles.
Note that real land parcels are rarely perfect geometric shapes. For irregular plots, break the parcel into simpler sub-shapes, calculate each separately, and add the areas together. For survey-grade accuracy, use a professional land surveyor or a GPS-based area measurement tool.
Frequently asked questions
There are exactly 43,560 square feet in one acre. This is equivalent to a square plot of about 208.7 feet on each side, or a rectangle 100 feet wide by 435.6 feet long.
One hectare equals 2.47105 acres, or equivalently one acre is about 0.404686 hectares. Hectares are the metric equivalent commonly used in most countries outside the US and UK.
Multiply the length and width of the rectangular portion in feet, then divide by 43,560. For irregular plots, divide the parcel into triangles and rectangles, compute each area in square feet, sum them, and divide the total by 43,560.
Also known as
TG we-Calculate Editorial Team. (2026). Acreage Calculator — Land Area in Acres [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/acreage-calculator
TG we-Calculate Editorial Team. "Acreage Calculator — Land Area in Acres." TG we-Calculate. 2026. https://we-calculate.com/calculator/acreage-calculator.
TG we-Calculate Editorial Team, "Acreage Calculator — Land Area in Acres," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/acreage-calculator
@misc{wecalculate_acreage_calculator, title = {Acreage Calculator — Land Area in Acres}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/acreage-calculator}}, year = {2026}, note = {TG we-Calculate} }
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