Land Acreage: worked example
| Length (ft) | 660 |
|---|---|
| Width (ft) | 330 |
| Acres | 5 |
| Square feet | 217,800 |
| Square meters | 20,234.3 |
Land Acreage: formula
BLM: Specifications for Descriptions of Land (2017) · NIST SP 811: Conversion factors by quantity
Common error: Using a listing's acreage as if it were surveyed. Many are rounded or come from tax records, so a survey is the number that counts for a purchase or a permit.
Use horizontal-plan length and width in feet from a reliable survey or parcel record. The rectangular model does not resolve irregular boundaries or sloping-ground distances. One acre is 43,560 ft²; a professional survey’s stated area is preferable to multiplying two approximate sides of an irregular parcel.
Land Acreage: changing Length (ft)
| Length (ft) | Acres | Square feet | Square meters |
|---|---|---|---|
| 528 | 4 | 174,240 | 16,187.4 |
| 594 | 4.5 | 196,020 | 18,210.9 |
| 660 (example) | 5 | 217,800 | 20,234.3 |
| 726 | 5.5 | 239,580 | 22,257.7 |
| 792 | 6 | 261,360 | 24,281.1 |
Land Acreage: compare input ranges
| Input | Tested from | To | Acres: low input | Acres: high input | Swing |
|---|---|---|---|---|---|
| Length (ft) | 594 | 726 | 4.5 | 5.5 | 1 (20%) |
| Width (ft) | 297 | 363 | 4.5 | 5.5 | 1 (20%) |
Land Acreage: individual input comparisons
| Input | Value | Acres | Square feet | Square meters |
|---|---|---|---|---|
| Length (ft) | 528 | 4 | 174,240 | 16,187.4 |
| 594 | 4.5 | 196,020 | 18,210.9 | |
| 660 | 5 | 217,800 | 20,234.3 | |
| 726 | 5.5 | 239,580 | 22,257.7 | |
| 792 | 6 | 261,360 | 24,281.1 | |
| Width (ft) | 264 | 4 | 174,240 | 16,187.4 |
| 297 | 4.5 | 196,020 | 18,210.9 | |
| 330 | 5 | 217,800 | 20,234.3 | |
| 363 | 5.5 | 239,580 | 22,257.7 | |
| 396 | 6 | 261,360 | 24,281.1 |
Land Acreage: combined input changes
| Length (ft) / Width (ft) | 264 | 330 | 396 |
|---|---|---|---|
| 528 | 3.2 | 4 | 4.8 |
| 594 | 3.6 | 4.5 | 5.4 |
| 660 | 4 | 5 | 6 |
| 726 | 4.4 | 5.5 | 6.6 |
| 792 | 4.8 | 6 | 7.2 |
Land Acreage: which assumptions move the result?
Land Acreage: values and definitions
| Quantity and definition | Value used |
|---|---|
| Length (ft) | 660 |
| Width (ft) | 330 |
| Acres | 5 |
| Square feet | 217,800 |
| Square meters | 20,234.3 |
Land Acreage: half and double Length (ft)
| Length (ft) | Acres |
|---|---|
| 330 | 2.5 |
| 660 | 5 |
| 1,320 | 10 |
A horizontal area estimate does not determine buildable area, title or a legal boundary. Setbacks, easements, roads, water, wetlands, slopes and applicable development rules need their own review. A parcel viewer or listing can differ from a boundary survey; the calculator cannot adjudicate that discrepancy.
Real Estate Investing calculators: Cap Rate Calculator, Cash-on-Cash Return Calculator, Rental Cash Flow Calculator, Net Operating Income (NOI) Calculator, DSCR Calculator, Gross Rent Multiplier Calculator.
An acre is 43,560 square feet. A triangular parcel with a 660-foot base and a perpendicular 330-foot height has half the rectangle’s area: 108,900 square feet, or 2.5 acres. Five acres are equivalent to about 20,234 square meters or 2 hectares.
A sloping boundary and its perpendicular height are different measurements; multiplying two boundary lengths alone does not establish a triangle’s area.
Split an odd shape into rectangles and triangles, add their areas, then divide. A lot with a diagonal side is not a rectangle, and the product of its longest sides overstates it.
Compare parcels with the price per square foot calculator, and convert areas with the unit conversion pages. For projects on the land, the fence, concrete and lawn calculators estimate materials. The mortgage and property tax calculators show carrying costs.
How many square feet are in an acre?
43,560 square feet, which is equal to a square about 208.7 feet on each side, or 4,047 square meters.
How do I find the acreage of an irregular lot?
Split it into rectangles and triangles and add their areas, or use the survey or the county parcel record, which states the official acreage.
Is all the land buildable?
Not necessarily. Setbacks, easements, wetlands, slopes and septic requirements can reduce the area where you can build.