Calculate Land Area
Select a shape, enter dimensions, and get the area in all common units instantly. Useful for real estate, farming, landscaping, and construction.
For irregular shapes, enter the known total area from a survey or GPS measurement and select the unit. All other units will be computed automatically.
Common Lot Sizes Reference
Here are standard residential and agricultural lot sizes with their dimensions and area equivalents for quick reference.
| Lot Description | Approx. Dimensions (ft) | Square Feet | Square Meters | Acres | Hectares |
|---|---|---|---|---|---|
| 1/8 acre lot | 74 x 74 | 5,445 | 506 | 0.125 | 0.051 |
| 1/4 acre lot | 104 x 104 | 10,890 | 1,012 | 0.250 | 0.101 |
| 1/3 acre lot | 120 x 121 | 14,520 | 1,349 | 0.333 | 0.135 |
| 1/2 acre lot | 148 x 148 | 21,780 | 2,023 | 0.500 | 0.202 |
| 1 acre | 209 x 209 | 43,560 | 4,047 | 1.000 | 0.405 |
| 2 acres | 295 x 295 | 87,120 | 8,094 | 2.000 | 0.809 |
| 5 acres | 467 x 467 | 217,800 | 20,234 | 5.000 | 2.023 |
| 10 acres | 660 x 660 | 435,600 | 40,469 | 10.000 | 4.047 |
| 1 hectare | 328 x 328 | 107,639 | 10,000 | 2.471 | 1.000 |
Dimensions shown are for approximate square plots. Actual lot shapes vary. One acre equals exactly 43,560 square feet.
How Land Area is Calculated
The formula used depends on the shape of the land:
Rectangle
Area = Length x Width
Most common for residential lots and farm fields. Multiply two perpendicular sides.
Triangle
Area = (Base x Height) / 2
Useful for corner lots or wedge-shaped parcels. The height must be perpendicular to the base.
Circle
Area = pi x Radius^2
Used for circular irrigation zones, roundabout areas, or circular pond boundaries.
Trapezoid
Area = (Base1 + Base2) / 2 x Height
Common in irregularly bounded parcels where two opposite sides are parallel but of different lengths, such as lots along a curved road.
Irregular Shapes
For irregularly shaped land that does not fit a standard geometry, break the plot into simpler shapes (rectangles, triangles, etc.) and add the areas together. You can also enter the total area directly if you already know it from a survey, deed, or GPS measurement.
Understanding Land Measurement Units
Acre
An acre is the most common unit for measuring land in the United States and United Kingdom. One acre equals exactly 43,560 square feet. Historically, an acre was defined as the amount of land a yoke of oxen could plow in one day. A square acre measures approximately 208.7 feet on each side. For context, a standard American football field (without end zones) is about 1.1 acres.
Hectare
A hectare is the standard metric unit for land area, used in most countries outside the US. One hectare equals 10,000 square meters (100 m x 100 m), or about 2.471 acres. It is widely used in agriculture, forestry, and land-use planning around the world.
Square Foot and Square Meter
Square feet (sq ft) and square meters (sq m) are the most granular units used for measuring smaller plots, building lots, and indoor areas. One square meter equals approximately 10.764 square feet. These units are common in real estate listings and construction projects.
Square Yard
A square yard equals 9 square feet (3 ft x 3 ft). It is sometimes used in land measurement in the UK and India. One acre contains 4,840 square yards.
Conversion Quick Reference
| From | To | Multiply By |
|---|---|---|
| Square Feet | Square Meters | 0.09290 |
| Square Meters | Square Feet | 10.7639 |
| Square Feet | Acres | 0.00002296 |
| Acres | Square Feet | 43,560 |
| Acres | Hectares | 0.40469 |
| Hectares | Acres | 2.47105 |
| Square Yards | Square Feet | 9 |
| Square Meters | Hectares | 0.0001 |
Frequently Asked Questions
How do I calculate land area?
Land area depends on the shape of the plot. For a rectangle, multiply length by width. For a triangle, multiply base by height and divide by 2. For a circle, use pi times the radius squared (pi x r^2). For a trapezoid, add the two parallel sides, divide by 2, then multiply by the height. For irregular shapes, break the plot into simpler shapes and sum the areas.
How many square feet are in an acre?
One acre contains exactly 43,560 square feet. A square plot measuring one acre would be approximately 208.7 feet on each side. An acre is roughly the size of a standard football field (without end zones).
How many acres is my lot?
To find how many acres your lot is, first calculate the total area in square feet (length x width for a rectangular lot), then divide by 43,560. For example, a 100 ft x 200 ft lot is 20,000 square feet, or about 0.459 acres. Use this calculator to get the exact conversion instantly.
What is the difference between an acre and a hectare?
An acre is 43,560 square feet (approximately 4,047 square meters). A hectare is 10,000 square meters (approximately 107,639 square feet, or 2.471 acres). Hectares are the international metric standard; acres are commonly used in the US, UK, and some other countries.
How do I calculate area for an irregularly shaped lot?
For irregular lots, break the shape into simpler geometric shapes (rectangles, triangles, trapezoids) and calculate each piece separately, then sum them up. If you have a survey or GPS measurement that gives you the total area in one unit, enter it in the "Irregular" mode of this calculator to convert to all other units.
How big is a quarter-acre lot?
A quarter-acre lot is 10,890 square feet (about 1,012 square meters). If square, it would measure approximately 104 feet on each side. This is a common size for suburban residential lots in many US neighborhoods.
Does this calculator store my data?
No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.
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Privacy
This calculator runs entirely in your browser. No dimensions, area results, or cost estimates are transmitted or stored anywhere. Your data stays on your device.
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Land Area Calculator FAQ
How do I calculate land area?
Land area depends on the shape of the plot. For a rectangle, multiply length by width. For a triangle, multiply base by height and divide by 2. For a circle, use pi times the radius squared. For a trapezoid, add the two parallel sides, divide by 2, then multiply by the height.
How many square feet are in an acre?
One acre contains exactly 43,560 square feet. An acre is roughly the size of a football field without the end zones (which is 48,000 sq ft). A square plot of one acre measures approximately 208.7 feet on each side.
How many acres is my lot?
To find how many acres your lot is, first calculate the total area in square feet (length x width for a rectangle), then divide by 43,560. For example, a 100 ft x 200 ft lot is 20,000 sq ft, or about 0.459 acres.
What is the difference between an acre and a hectare?
An acre is 43,560 square feet (approximately 4,047 square meters), while a hectare is 10,000 square meters (approximately 107,639 square feet or 2.471 acres). Hectares are used in most countries; acres are common in the US, UK, and a few other nations.
How do I calculate area for an irregularly shaped lot?
For irregular lots, break the shape into simpler shapes (rectangles, triangles) and calculate each piece separately, then add them together. Professional land surveys use GPS coordinates and specialized software for precise measurements.
Does this calculator store my data?
No. All calculations run entirely in your browser. No data is sent to any server, and nothing is stored.