Land Area Calculator
Measure a lot or parcel — rectangles, triangles, trapezoids, or circles — to get total acres, hectares, and square footage, plus an estimated land value and a downloadable PDF report.
| Parcel | Shape | Dimensions | Acres | Sq Ft | % of Total | Value |
|---|---|---|---|---|---|---|
| Calculate to see parcels | ||||||
Calculate to see parcels
How to use the land area calculator
Four quick steps turn boundary measurements into total acreage — with hectares, square feet, a usable-area figure, an estimated land value, and a downloadable PDF.
Add each parcel
Name every piece and pick its shape — rectangle, triangle, trapezoid, or circle.
Enter the dimensions
Work in feet, yards, or meters — switching units re-reads every measurement.
Set price & deductions
Add a rate per acre, sq ft, or hectare, and the share that’s unbuildable.
Read results & save a PDF
Get acres, hectares, usable land, value, and a per-parcel breakdown.
How land area and acreage are calculated
Every parcel resolves into one of four shape formulas. Add them up for the total square footage, divide by 43,560 for acres, then apply your deduction and price. Here is the exact math.
Worked example — a 300 × 435 ft rectangular lot
Area: 300 × 435 = 130,500 sq ft
Acres: 130,500 ÷ 43,560 = 3.00 acres
Hectares: 3.00 × 0.4047 = 1.21 ha
Value: 3.00 acres × $50,000 = $149,800
≈ 3 acres, 1.21 hectares, worth about $150,000 at $50,000 an acre.
Land area & acreage charts
Handy lookups for the numbers that come up when sizing a parcel — lot dimensions in acres, unit conversions, what each acreage looks like, and typical unbuildable deductions.
| Lot size | Square feet | Acres | Hectares |
|---|---|---|---|
| 50 × 100 ft | 5,000 sq ft | 0.115 ac | 0.046 ha |
| 60 × 120 ft | 7,200 sq ft | 0.165 ac | 0.067 ha |
| 80 × 125 ft | 10,000 sq ft | 0.230 ac | 0.093 ha |
| 100 × 150 ft | 15,000 sq ft | 0.344 ac | 0.139 ha |
| 150 × 145 ft | 21,750 sq ft | 0.499 ac | 0.202 ha |
| 208.7 × 208.7 ft | 43,560 sq ft | 1.000 ac | 0.405 ha |
A square acre is 208.7 feet on each side, but acres come in every shape — a long narrow parcel and a square one can hold identical acreage.
| Convert | Multiply / divide | Where it’s used |
|---|---|---|
| Sq ft → acres | ÷ 43,560 | US land and lot sizing |
| Sq m → hectares | ÷ 10,000 | Metric land standard |
| Hectares → acres | × 2.471 | Reading international listings |
| Acres → hectares | × 0.4047 | Quoting a US parcel abroad |
| Acres → sq yards | × 4,840 | Older deeds and surveys |
Match the price basis to the area unit before comparing rates — a per-hectare figure looks roughly 2.5× a per-acre figure for identical land.
| Acreage | Square feet | Rough comparison |
|---|---|---|
| 0.25 acre | 10,890 sq ft | Typical suburban lot |
| 0.5 acre | 21,780 sq ft | Large suburban lot |
| 1 acre | 43,560 sq ft | ~¾ of a football field |
| 5 acres | 217,800 sq ft | Small hobby farm |
| 10 acres | 435,600 sq ft | ~7.6 football fields |
| 640 acres | 27.9M sq ft | One square mile (a section) |
Football field comparisons use 57,600 sq ft including the end zones. The calculator shows the same comparison live as you enter parcels.
| Constraint | Typical share lost | Why |
|---|---|---|
| Front, side & rear setbacks | 10–25% | Zoning keeps structures off the boundary |
| Utility & access easements | 5–15% | Others hold rights across the strip |
| Road right-of-way | 5–10% | Frontage dedicated to the roadway |
| Steep slope / hillside | 25–50% | Grade makes building impractical |
| Wetlands or floodplain | 20–50% | Protected or restricted from development |
These are planning ballparks only. Actual restrictions come from your local zoning code, the recorded plat, and any environmental designations on the parcel.
Real boundaries are rarely tidy, but almost every parcel breaks cleanly into these four shapes once you look at where the lines change direction.
- Four-sided with unequal ends — that’s a trapezoid, the most common irregular lot shape.
- Narrowing to a point — a corner or wedge is a triangle; measure base and perpendicular height.
- Ponds and cul-de-sac bulbs — round features are circles, added or measured separately.
Everything the calculator works out
One set of boundary measurements gives you the full picture — the acreage in every unit, what’s buildable, what it’s worth, and how each parcel contributes.
The figures behind every acreage calculation
Built for any land decision
A building lot, a rural parcel, or a listing you’re checking — the same measurements answer all three, once they’re in acres.
Checking whether a listing’s stated acreage matches the boundaries, and what the asking price works out to per acre.
- Compare to the listed acreage
- Price it per acre to compare deals
- Confirm with the plat before offering
Working out how much of a lot is actually usable once setbacks, easements, and slopes are taken off the gross figure.
- Enter a realistic deduction
- Value the usable land only
- Check setbacks with the zoning code
Sizing up fields, pasture, or a section they’re thinking of splitting off, and converting between acres and hectares.
- Add each field as a parcel
- Read the hectare conversion
- Save the PDF for your records
7 tips for measuring land accurately
Small habits that keep an acreage estimate honest — and keep you from paying for land that isn’t there.
Land area calculator FAQ
The acreage, conversion, usable-area, and land value questions people ask most before buying or building.
One acre is exactly 43,560 square feet. To convert any parcel to acres, work out its area in square feet and divide by 43,560.
A square acre measures about 208.7 ft on each side, though acres come in every shape. For scale, an acre is roughly three quarters of an American football field including the end zones.
Multiply the length by the width in feet, then divide by 43,560. A lot measuring 300 by 435 feet is 130,500 square feet, which comes to about 3 acres.
If the lot isn’t a simple rectangle, split it into rectangles, triangles, trapezoids, and circles, calculate each one, and add the acreages together.
Break the parcel into simple shapes that meet without overlapping, measure each one, and total the areas. A four-sided lot with two unequal parallel sides is a trapezoid; a lot that narrows to a point is a triangle.
Most irregular parcels resolve into two or three shapes. Enter each as its own parcel so you can see how much area each piece contributes.
One hectare is 10,000 square meters, which equals about 2.471 acres. Going the other way, one acre is roughly 0.405 hectares.
Hectares are the standard land unit across most of the world, while acres remain standard in the United States. Listings that cross markets often quote both.
Gross area is the full parcel measured to its boundaries. Usable area is what’s left after subtracting land you can’t build on — setbacks, easements, wetlands, floodplain, or steep slopes.
The gap matters because a parcel is often priced on gross acreage but developed on usable acreage. A 3 acre lot with a 20% deduction leaves about 2.4 acres to work with.
A standard suburban lot commonly loses 10 to 25 percent to front, side, and rear setbacks. Utility and access easements usually take another 5 to 15 percent, and wetlands or steep slopes can remove far more.
The only reliable figures come from your local zoning code and the recorded plat. Treat any percentage entered here as a planning assumption, not a determination.
Multiply the acreage by the going rate per acre for comparable land. At $50,000 an acre, a 3 acre parcel comes to roughly $150,000.
Rural land is usually quoted per acre, urban lots per square foot, and metric markets per hectare, so make sure the rate and the area use the same basis. Frontage, access, utilities, zoning, and topography all move the rate well beyond what raw acreage suggests.
No. This is a planning estimate calculated from the dimensions you enter, treating each parcel as a clean geometric shape. Real boundaries curve, jog, and follow natural features, and legal descriptions are written from measured bearings and distances.
For a deed, a mortgage, a boundary dispute, or a subdivision application, you need a licensed surveyor’s plat. Use this to sanity-check a listing or size up a parcel before that stage.
Not a Survey — Planning Estimate Only: This calculator computes area, acreage, and unit conversions from the dimensions you enter, treating each parcel as an idealized rectangle, triangle, trapezoid, or circle. Actual boundaries are established only by a licensed surveyor and the recorded plat or legal description, and results here carry no legal standing for deeds, financing, boundary disputes, subdivision, or permitting. The usable-area figure applies whatever percentage you enter and does not reflect your jurisdiction’s actual setbacks, easements, right-of-way, floodplain, or environmental restrictions — confirm those with your local planning or zoning department. Land value is a simple rate multiplication and is not an appraisal; access, utilities, zoning, topography, and frontage materially affect real market value. For planning purposes only.