Acreage Calculator
Calculate land area instantly from dimensions. Supports 6 shapes: rectangle, triangle, circle, trapezoid, ellipse & known area — with real-time visual feedback.
An acreage calculator converts land dimensions into acres by dividing the total area in square feet (sq ft) by 43,560. This free online land area calculator accepts 6 shape types—rectangle, triangle, circle, trapezoid, ellipse, and known area (direct input)—and supports 7 input units: feet (ft), yards (yd), meters (m), centimeters (cm), inches (in), miles (mi), and kilometers (km). The tool produces real-time results in 6 output units—acres, hectares, square meters (m²), square feet (sq ft), square miles (mi²), and square kilometers (km²)—with a perimeter estimate and an interactive shape diagram.
The acreage calculator serves 3 main purposes: calculating land area for real estate transactions, estimating farm and ranch acreage for agriculture, and measuring lot sizes for construction and zoning compliance. This page covers what an acre is, how to calculate acreage by feet for rectangles and other shapes, how to measure acreage with Google Maps and Google Earth, a unit conversion reference table with hectares to acres and acres to square feet conversions, and answers to 11 frequently asked questions about land measurement.
What is an Acre?
An acre is a unit of land area in the Imperial measurement system equal to 43,560 square feet (sq ft), 4,046.86 square meters (m²), or 0.4047 hectares (ha). The United States, the United Kingdom, and former British colonies use acres for land measurement in real estate, agriculture, surveying, and government land transactions.
The acre originated from medieval English farming. One acre represented the amount of land a yoke of oxen could plow in a single day—a strip measuring 1 chain (66 feet / 20.12 meters) wide by 1 furlong (660 feet / 201.17 meters) long. The United States Department of Agriculture (USDA) and the National Agricultural Statistics Service (NASS) continue to use acres as the standard unit for reporting farmland data across all 50 states.
The green overlay shows 1 acre relative to the selected field. Toggle between comparisons to see how an acre measures up.
How Big is an Acre?
One acre measures 43,560 square feet (sq ft), 4,840 square yards (yd²), or 4,046.86 square meters (m²). The standard acre dimensions are 66 feet (20.12 m) wide by 660 feet (201.17 m) long, based on the chain-and-furlong system used in English land surveying.
An acre has no fixed shape. A square acre measures 208.71 feet (63.61 m) per side. A narrow acre can measure 10 feet (3.05 m) wide by 4,356 feet (1,327.6 m) long. The total area remains 43,560 sq ft regardless of shape.
| Unit of Measure | Equivalent to 1 Acre |
|---|---|
| Square Feet | 43,560 ft² |
| Square Yards | 4,840 yd² |
| Square Meters | 4,046.86 m² |
| Hectares | 0.4047 ha |
| Square Miles | 0.0015625 mi² (640 acres = 1 mi²) |
| Square Kilometers | 0.004047 km² |
| Square Inches | 6,272,640 in² |
| Perches / Rods | 160 perches (1 rod = 16½ ft / 5.03 m) |
An acre has no fixed shape — all these shapes have exactly the same area: 43,560 sq ft.
Lot Size Reference: What Does an Acre Look Like?
One acre covers about 75% of an American football field (including end zones) or 89% of a standard FIFA soccer field. Here are 5 real-world size comparisons for one acre of land:
Land parcels in real estate and agriculture are sold in fractional portions of an acre. Here is a quick reference for common lot sizes in square feet:
Click a fraction to see how much of an acre it covers. The green area shows the selected portion.
How to Calculate Acres
To calculate acreage, multiply the length by the width of the land in feet and divide the result by 43,560. The acreage calculator above performs this calculation automatically for 6 shape types and displays results in 6 area units.
The Basic Formula
To calculate acreage of land for a rectangular or square parcel, use the following acreage formula:
330 × 660 = 217,800 sq ft
217,800 ÷ 43,560 = 5 acres (2.02 ha)
3 steps to calculate acreage by hand:
- Measure the length and width of the land in feet using a measuring tape, GPS device, or property survey (plat map)
- Multiply length × width to get the total area in square feet
- Divide the square feet total by 43,560 to convert square feet to acres
Acreage Calculator by Feet — Other Shapes
Not all land parcels are rectangular. The acreage calculator supports 5 additional shapes for irregular land area calculations:
(400 × 300 ÷ 2) ÷ 43,560 = 1.38 acres (0.56 ha)
(3.14159 × 100²) ÷ 43,560 = 0.72 acres (0.29 ha)
(3.14159 × 150 × 75) ÷ 43,560 = 0.81 acres (0.33 ha)
87,120 ÷ 43,560 = 2 acres (0.81 ha)
((100 + 200) ÷ 2 × 150) ÷ 43,560 = 0.52 acres (0.21 ha)
Perimeter
The perimeter of an acre depends on the land parcel shape. Here are the perimeter values for 3 common acre shapes:
Square acre (208.71 ft per side): 4 × 208.71 = 834.84 ft (254.46 m)
Circular acre (r = 117.75 ft): 2 × π × 117.75 = 740.08 ft (225.57 m)
Measuring Acreage with Google Maps
Google Maps provides a free way to calculate acreage for any land parcel using satellite imagery and the built-in distance measurement tool. Here are 5 steps to measure acreage with Google Maps:
- Open Google Maps (maps.google.com) and search for the property address or GPS coordinates
- Switch to Satellite view by clicking the "Layers" button in the bottom-left corner
- Right-click on a starting point of the property boundary and select "Measure distance"
- Click along each corner of the property boundary to outline the land parcel
- Close the shape by clicking on the starting point — Google Maps displays the total area in square feet (sq ft) and square meters (m²)
Divide the displayed square feet value by 43,560 to convert to acres. Google Maps area measurements are accurate within 1–2% for most residential and agricultural properties.
Measuring Acreage with Google Earth
Google Earth Pro is a free Google Earth acreage calculator that provides more precise acreage measurements than Google Maps. Google Earth Pro includes a built-in polygon area tool with direct acre output and higher resolution satellite imagery. Here are 6 steps to measure acreage with Google Earth:
- Download and install Google Earth Pro (free) from earth.google.com
- Search for the property address or coordinates in the search bar
- Select the "Add Polygon" tool from the toolbar (or go to Add > Polygon)
- Click along each corner of the property boundary to trace the perimeter
- Close the polygon by clicking on the starting point
- View the calculated area in the "Measurements" tab — Google Earth Pro displays results in acres, hectares, square feet (sq ft), and square meters (m²)
Google Earth Pro provides higher resolution satellite imagery than Google Maps, making property boundary identification easier for farmland, timberland, vineyard acreage, and large rural parcels. Tools such as Zillow, LandGlide, and Regrid offer parcel boundary overlays and cadastral map data that pair well with Google Earth Pro for land area verification.
Unit Conversion Reference Table
The following reference table provides area unit conversions between 10 common land measurement units used in real estate, agriculture, and surveying:
| From | To | Multiply By |
|---|---|---|
| Acres | Square Feet | 43,560 |
| Acres | Square Meters | 4,046.86 |
| Acres | Hectares | 0.404686 |
| Acres | Square Miles | 0.0015625 |
| Acres | Square Yards | 4,840 |
| Acres | Square Kilometers | 0.00404686 |
| Hectares | Acres | 2.471054 |
| Square Feet | Acres | 0.00002296 |
| Square Meters | Acres | 0.000247105 |
| Square Miles | Acres | 640 |
Supported Input Units
The acreage calculator accepts 7 input units for length measurements:
- Feet (ft) — base unit, 1 ft = 0.3048 m
- Yards (yd) — 1 yd = 3 ft (0.9144 m)
- Meters (m) — 1 m = 3.28084 ft
- Centimeters (cm) — 1 cm = 0.0328084 ft
- Inches (in) — 1 in = 0.0833 ft (2.54 cm)
- Miles (mi) — 1 mi = 5,280 ft (1.609 km)
- Kilometers (km) — 1 km = 3,280.84 ft
Hectares to Acres
To convert hectares to acres, multiply the hectare value by 2.471054. One hectare (ha) equals 2.471054 acres, 10,000 square meters (m²), or 107,639 square feet (sq ft). The hectare is the standard land measurement unit in most countries outside the United States.
| Hectares | Acres | Square Feet |
|---|---|---|
| 1 ha | 2.47 acres | 107,639 ft² |
| 5 ha | 12.36 acres | 538,196 ft² |
| 10 ha | 24.71 acres | 1,076,391 ft² |
| 20 ha | 49.42 acres | 2,152,782 ft² |
| 50 ha | 123.55 acres | 5,381,955 ft² |
| 100 ha | 247.11 acres | 10,763,910 ft² |
Acres to Square Meters
To convert acres to square meters, multiply the acre value by 4,046.86. One acre equals 4,046.86 square meters (m²) or 0.4047 hectares (ha). Square meters are the standard area unit in the metric system used by Geographic Information System (GIS) and spatial analysis tools.
| Acres | Square Meters | Hectares |
|---|---|---|
| 1 acre | 4,046.86 m² | 0.4047 ha |
| 5 acres | 20,234.3 m² | 2.02 ha |
| 10 acres | 40,468.6 m² | 4.05 ha |
| 25 acres | 101,171.5 m² | 10.12 ha |
| 50 acres | 202,343 m² | 20.23 ha |
| 100 acres | 404,686 m² | 40.47 ha |
Acres to Square Miles
To convert acres to square miles, divide the acre value by 640. One square mile (mi²) equals 640 acres, 2.59 square kilometers (km²), or 27,878,400 square feet (sq ft). The acres-to-square-miles conversion is based on the U.S. Public Land Survey System (PLSS), where 1 section = 1 square mile = 640 acres.
| Acres | Square Miles | Square Kilometers |
|---|---|---|
| 1 acre | 0.0016 mi² | 0.0040 km² |
| 10 acres | 0.0156 mi² | 0.0405 km² |
| 100 acres | 0.1563 mi² | 0.4047 km² |
| 320 acres | 0.5 mi² (half section) | 1.295 km² |
| 640 acres | 1 mi² (full section) | 2.59 km² |
| 1,000 acres | 1.5625 mi² | 4.047 km² |
Acreage to Square Feet — Quick Reference
The following table converts common acreage values to square feet (sq ft), square yards (yd²), and square meters (m²) for property size calculations, tax assessment land sizing, and subdivision lot acreage estimates:
| Acres | Square Feet | Square Yards | Square Meters |
|---|---|---|---|
| 0.25 acres | 10,890 ft² | 1,210 yd² | 1,011.71 m² |
| 0.33 acres | 14,375 ft² | 1,597 yd² | 1,335.46 m² |
| 0.5 acres | 21,780 ft² | 2,420 yd² | 2,023.43 m² |
| 1 acre | 43,560 ft² | 4,840 yd² | 4,046.86 m² |
| 2 acres | 87,120 ft² | 9,680 yd² | 8,093.72 m² |
| 2.5 acres | 108,900 ft² | 12,100 yd² | 10,117.15 m² |
| 5 acres | 217,800 ft² | 24,200 yd² | 20,234.3 m² |
| 10 acres | 435,600 ft² | 48,400 yd² | 40,468.6 m² |
| 20 acres | 871,200 ft² | 96,800 yd² | 80,937.2 m² |
| 40 acres | 1,742,400 ft² | 193,600 yd² | 161,874.4 m² |
| 50 acres | 2,178,000 ft² | 242,000 yd² | 202,343 m² |
| 100 acres | 4,356,000 ft² | 484,000 yd² | 404,686 m² |
Frequently Asked Questions
Common questions about acres, acreage calculations, land measurement, and unit conversions.
1 hectare is bigger than 1 acre. One hectare (ha) equals 2.471054 acres or 10,000 square meters (m²). One acre equals 0.4047 hectares—about 40% of a hectare. The hectare is the standard land measurement unit in most countries outside the United States, while acres remain standard in U.S. real estate and agriculture.
Acres became the standard U.S. land measurement unit because of their origin in English farming. One acre was defined as the area a yoke of oxen could plow in a single day—66 furrows, each 660 feet (201.17 m) long—totaling 43,560 square feet (sq ft). The U.S. inherited this unit from English common law, and acres remain embedded in property deeds, zoning codes, and USDA farmland reporting.
One acre is about 75% of an American football field (including end zones) or 89% of a FIFA soccer field. One acre equals 43,560 square feet (sq ft), which is roughly the same area as 16 tennis courts placed side by side, 4.5 NBA basketball courts, or 150 parking spaces.
About 3 single-family homes fit on 1 acre in a typical U.S. suburb. The average U.S. home sits on approximately ⅓ of an acre (14,520 sq ft / 1,349.1 m²). Lot sizes vary by location: larger suburban lots of ½ acre (21,780 sq ft) fit 2 homes per acre, while smaller urban lots of ¼ acre (10,890 sq ft) fit 4 homes per acre. High-density zoning allows 8–12 townhomes per acre.
Farm acreage ranges from ½ acre for a small farm to 40+ acres for a large farm. The USDA defines a farm as any place that produced and sold, or normally would produce and sell, at least $1,000 of agricultural products during the year. Ranches typically start at 100 acres in most states. The average U.S. farm size is 445 acres (180.1 ha), according to the USDA National Agricultural Statistics Service (NASS).
There are exactly 640 acres in one square mile (mi²). One square mile equals 640 acres, 2.59 square kilometers (km²), or 27,878,400 square feet (sq ft). This relationship comes from the U.S. Public Land Survey System (PLSS), where 1 section = 1 square mile = 640 acres, and 1 township = 36 sections = 23,040 acres.
Multiply the length by the width (in feet) and divide by 43,560 to get the acreage. For a rectangular lot: Acres = (Length × Width) ÷ 43,560. For a triangular parcel: Acres = (Base × Height ÷ 2) ÷ 43,560. For a circular area: Acres = (π × Radius²) ÷ 43,560. Use the acreage calculator at the top of this page for automatic results with real-time visual feedback.
No, 200 ft by 200 ft is not an acre. A 200 ft × 200 ft lot equals 40,000 square feet (sq ft), which is 0.918 acres. One full acre requires 43,560 sq ft. A 200 ft × 200 ft lot is 3,560 sq ft (330.7 m²) short of a full acre—about 92% of one acre.
Divide the lot size in square feet by 43,560 to convert to acres. For example, a 10,000 sq ft lot equals 10,000 ÷ 43,560 = 0.2296 acres. A 7,500 sq ft lot equals 0.1722 acres. Lot size information is available on property surveys, plat maps, tax assessment records, and real estate listing platforms such as Zillow and Regrid.
One acre is a lot size of 43,560 square feet (sq ft), 4,840 square yards (yd²), or 4,046.86 square meters (m²). Common acre-sized lot dimensions include 66 ft × 660 ft (standard acre), 208.71 ft × 208.71 ft (square acre), 150 ft × 290.4 ft, and 100 ft × 435.6 ft. Any rectangular dimensions that multiply to 43,560 sq ft equal 1 acre.
Yes, Google Maps can calculate acreage using the 'Measure distance' tool. Right-click on the map, select 'Measure distance', click along the property boundary corners, and close the shape. Google Maps displays the area in square feet (sq ft) and square meters (m²). Divide the square feet value by 43,560 to convert to acres. Google Earth Pro provides a more direct option with built-in acre output in the polygon measurement tool.