Answer first
What this calculator tells you
Calculate the acres in a rectangular lot from its length and width in feet. Check a parcel's size from two measurements when a listing gives only dimensions. Formula: Acres = length (ft) × width (ft) ÷ 43,560; 1 acre = 43,560 square feet. At the worked-example inputs, the acres is 5. Holding every other input steady, moving length (ft) from 528 to 792 moves the result from 4 to 6.
Transparent method
The formula
Check a parcel's size from two measurements when a listing gives only dimensions.
Worked example
Example inputs
How to interpret the result
An acre is 43,560 square feet, so a rectangular lot's acreage is its length times its width divided by that number. A lot 660 by 330 feet has 217,800 square feet, which is exactly 5 acres. In metric that is 20,234 square meters, about 2 hectares.
At the worked-example inputs the acres is 5. It rises with length (ft) and width (ft).
Actual vacancy, maintenance, financing, taxes and local law may differ.
Before you rely on it
What to check
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.
The common error
Where people go wrong with land acreage calculator
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.
Sensitivity evidence
How length (ft) changes the acres
Holding every other input at the worked-example value, moving length (ft) from 528 to 792 moves the acres from 4 to 6: a spread of 2, or 40% of the worked-example result.
| Length (ft) | Acres | Square feet | Square meters |
|---|---|---|---|
| 528 | 4 | 174,240 | 16,187.4 |
| 594 | 4.5 | 196,020 | 18,210.9 |
| 660worked example | 5 | 217,800 | 20,234.3 |
| 726 | 5.5 | 239,580 | 22,257.7 |
| 792 | 6 | 261,360 | 24,281.1 |
Every input, tested
Which input moves the acres most
Of the 2 inputs, length (ft) moves the acres most (1 across the range tested) and width (ft) moves it least (1).
| Input | Tested from | To | Acres at each end | Swing |
|---|---|---|---|---|
| Length (ft) | 594 | 726 | 4.5 to 5.5 | 1 (20%) |
| Width (ft) | 297 | 363 | 4.5 to 5.5 | 1 (20%) |
Two variables at once
Acres by length (ft) and width (ft)
Across the grid the acres runs from 3.2 to 7.2. Moving length (ft) from 528 to 792 shifts it by 2 at the middle column, and moving width (ft) from 264 to 396 shifts it by 2 at the middle row, so neither is the bigger lever here.
| 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 |
The highlighted cell is the worked example: 5.
Step by step
The worked example, input by input
| Input | Value used | What it means |
|---|---|---|
| Length (ft) | 660 | Enter the length (ft) used in this calculation. |
| Width (ft) | 330 | Enter the width (ft) used in this calculation. |
| Acres | 5 | |
| Square feet | 217,800 | |
| Square meters | 20,234.3 | |
Inputs, definitions and assumptions
Length (ft)
Enter the length (ft) used in this calculation. The prefilled worked-example value is 660.
Width (ft)
Enter the width (ft) used in this calculation. The prefilled worked-example value is 330.
How to use this calculator
- 1Verify the inputs. Gather length (ft) and width (ft) from your own documents; the prefilled values are examples.
- 2Save a baseline. The worked example puts the acres at 5. Store your own version of it as Scenario A.
- 3Test one change. Start with length (ft), the input with the biggest effect here: moving length (ft) from 594 to 726 takes the acres from 4.5 to 5.5, a swing of 20% of the worked-example figure.
- 4Check the extremes. At half the example length (ft) (330) the acres is 2.5; at double (1,320) it is 10.
People also ask
Frequently asked questions
How do you calculate land acreage?
Acres = length (ft) × width (ft) ÷ 43,560; 1 acre = 43,560 square feet. At the worked-example inputs the acres is 5.
What does the land acreage result mean?
Check a parcel's size from two measurements when a listing gives only dimensions. At the worked-example inputs the acres is 5. It rises with length (ft) and width (ft).
How much does length (ft) change the acres?
Holding every other input at the worked-example value, moving length (ft) from 528 to 792 moves the acres from 4 to 6, a spread of 2.
What are the limits of this land acreage calculator?
Actual vacancy, maintenance, financing, taxes and local law may differ. The tables on this page test length (ft) only from 528 to 792; a value outside that range is not tabulated here.
Which input moves the acres most in the land acreage calculator?
Ranked by how far each moves the acres across the range tested: length (ft) (1, 20%) and width (ft) (1, 20%).
If I double length (ft) in the land acreage calculator, does the acres double?
Doubling it from 660 to 1,320 takes the acres from 5 to 10, which is 2.00 times the worked-example figure. So the result scales almost exactly in proportion. Halving it to 330 gives 2.5.
How much does width (ft) matter in the land acreage calculator?
The worked example uses 330. With the other inputs left at the worked example, moving width (ft) from 297 to 363 takes the acres from 4.5 to 5.5, a swing of 20% of the worked-example figure.
Which inputs change the square feet in the land acreage calculator?
At the worked-example inputs it is 217,800. Length (ft) takes it from 196,020 to 239,580 and width (ft) takes it from 196,020 to 239,580.
Which inputs change the square meters in the land acreage calculator?
At the worked-example inputs it is 20,234.3. Length (ft) takes it from 18,210.9 to 22,257.7 and width (ft) takes it from 18,210.9 to 22,257.7.
What does NOI include and exclude?
It includes rental revenue less vacancy and operating expenses. It excludes mortgage payments, depreciation and income tax, deliberately. So that a property's operating performance is comparable regardless of how a particular buyer finances it.
Sources and evidence
Free Calculators Online is independent and is not affiliated with or endorsed by the source organizations. Educational estimates only.