TL;DR: An acreage calculator determines the size of a land plot, converting measurements into acres. An acre is a unit of area equal to 43,560 square feet.
- To find the acreage of a rectangular plot, multiply its length by its width in feet and divide the result by 43,560.
- Irregularly shaped land can be measured by dividing it into simpler geometric shapes like rectangles and triangles.
- Many online tools use satellite maps to calculate the acreage of a property by letting you draw its perimeter.
- An acre is equivalent to 0.4047 hectares or about 90% of an American football field.
- A square plot of land measuring 208.71 feet on each side is exactly one acre.
What Is an Acre?
An acre is a unit of land area equal to 43,560 square feet. This measurement is standard in both the imperial and US customary systems. While the origin of the acre is tied to the amount of land a man could plow with a team of oxen in one day, it is now defined by a precise number of square feet.
To visualize an acre, it is approximately the size of 16 tennis courts or about 90% of an American football field (from goal line to goal line). A perfect square acre would have sides of about 208.71 feet. This unit is most commonly used in real estate and agriculture for measuring large plots of land.
How to Calculate Acreage for Rectangular Land
The acreage of a rectangular or square plot of land is calculated by multiplying its length by its width and then dividing by 43,560. First, ensure both length and width are measured in the same unit, typically feet. The result of the multiplication gives you the total area in square feet.
The formula is simple: Acreage = (Length in feet × Width in feet) / 43,560. For example, a plot of land that is 500 feet long and 300 feet wide has an area of 150,000 square feet. Dividing 150,000 by 43,560 results in approximately 3.44 acres.
Calculating Acreage for Irregular Shapes
To calculate the acreage of an irregularly shaped plot, you must first break down the area into simpler, measurable geometric shapes. Common shapes include rectangles, squares, and triangles. You measure each of these smaller sections individually and then add their areas together to find the total square footage.
For a four-sided, non-rectangular plot, you can divide it into two triangles by measuring a diagonal line from one corner to the opposite one. The area of a triangle can be found using Heron's formula if you know the lengths of all three sides, or by using the formula Area = 0.5 × base × height. Once you have the total square footage from all the combined shapes, divide that number by 43,560 to get the total acreage.
Using an Online Acreage Calculator with Maps
Online acreage calculators often use satellite map interfaces to measure land area without manual measurements. These tools allow a user to outline a specific plot of land by clicking points along its boundary on a map. The software then automatically calculates the area enclosed by the drawn polygon.
This method is highly effective for irregularly shaped parcels, properties with difficult terrain, or when a quick estimate is needed. The accuracy depends on the quality of the satellite imagery and the precision of the user's outline. Most tools provide the result in multiple units, including acres, square feet, and hectares.
Common Acreage Conversions
Converting between acres and other units of area is a common requirement in land management, real estate, and planning. The table below provides conversion factors for the most frequently used units.
| Unit | Equivalent in Acres | How to Convert from Acres |
|---|---|---|
| Square Feet | 1 acre = 43,560 sq ft | Multiply acres by 43,560 |
| Square Yards | 1 acre = 4,840 sq yd | Multiply acres by 4,840 |
| Square Meters | 1 acre = 4,046.86 m² | Multiply acres by 4,046.86 |
| Hectares | 1 acre = 0.4047 ha | Multiply acres by 0.4047 |
| Square Miles | 1 sq mi = 640 acres | Divide acres by 640 |
Frequently Asked Questions
How do you calculate acres of land? To calculate the acreage of a rectangular piece of land, measure its length and width in feet, multiply them to get the square footage, and then divide the result by 43,560.
Is 200 ft by 200 ft 1 acre? No, a plot measuring 200 feet by 200 feet is 40,000 square feet, which is approximately 0.92 acres. A full acre is 43,560 square feet.
How do I calculate lot size to acres? To convert any lot size to acres, you must first find its total area in square feet. Once you have the total square footage, divide that number by 43,560 to determine the size in acres.
Can Google Maps calculate acreage? Yes, you can calculate acreage using Google Maps by using its built-in "Measure distance" tool. Right-click on the map to start, click points to create a perimeter, and the tool will calculate the total area, which you can then convert to acres.