Fence Ledger
Enough people ask this that almost every fencing site has an answer ready, and almost all of them give the same one: 835 feet. That number is right about a square and silent about everything else, which is a problem, because the difference between a square acre and a long one is two hundred feet of fence.
208.7 ft on each of four sides. Shaped as a 4:1 rectangle instead, the same acre needs 1,044 ft.
Every figure below is computed, not compiled from other charts. Perimeters are the geometry of a rectangle of that area; post counts come from the same engine the calculators run on, fenced on all four sides so the corner posts are counted rather than lost to a division.
| Acres | If square | If 4:1 | Posts | Installed |
|---|---|---|---|---|
| ¼104 × 104 ft | 417 ft1,670 ft per acre | 522 ft+104 ft | 56 | $7,514–22,958 |
| ½148 × 148 ft | 590 ft1,181 ft per acre | 738 ft+148 ft | 76 | $10,626–32,468 |
| 1209 × 209 ft | 835 ft835 ft per acre | 1,044 ft+209 ft | 108 | $15,027–45,916 |
| 2295 × 295 ft | 1,181 ft590 ft per acre | 1,476 ft+295 ft | 148 | $21,252–64,935 |
| 3361 × 361 ft | 1,446 ft482 ft per acre | 1,807 ft+361 ft | 184 | $26,028–79,529 |
| 5467 × 467 ft | 1,867 ft373 ft per acre | 2,333 ft+467 ft | 236 | $33,602–102,672 |
| 10660 × 660 ft | 2,640 ft264 ft per acre | 3,300 ft+660 ft | 332 | not wood privacy at this acreage — see the note below the table |
| 20933 × 933 ft | 3,734 ft187 ft per acre | 4,667 ft+933 ft | 468 | not wood privacy at this acreage — see the note below the table |
| 401,320 × 1,320 ft | 5,280 ft132 ft per acre | 6,600 ft+1,320 ft | 660 | not wood privacy at this acreage — see the note below the table |
Square and 4:1 columns are the perimeter of a rectangle of that area. Post counts come from the same engine the calculators use, at 8 ft spacing and fenced on all four sides, so the four corner posts are counted. Cost uses this site's verified installed range of $18–55 per linear foot for 6 ft wood privacy fence, and stops above 5 acres: nobody encloses ten acres in privacy fence, so multiplying that rate out would produce a confident figure for a thing nobody builds. We have no verified rate for field or barbed wire, so those rows stay blank.
An acre is 43,560 square feet, always. How far it is around the outside is not a property of that number at all — it depends entirely on the shape. This is not a technicality. It is the single most useful thing to understand before you price a fence, because it is where estimates go wrong by thousands of dollars while looking perfectly reasonable.
The consequence people find most surprising: four separate quarter-acre lots need about twice as much fence as one acre holding exactly the same amount of land. A quarter acre comes to roughly 417 ft around, so four of them is about 1,670 ft, against 835 ft for the single acre. Subdividing land multiplies boundary without adding any ground.
Run the same logic the other way and you get the “ft per acre” column. Fence per acre enclosed falls from about 1,670 ft on a quarter acre to about 132 ft on forty — a factor of nearly thirteen. Perimeter grows with the square root of area, so four times the land needs only twice the fence. It is why a small suburban yard is expensive to enclose for what it encloses, and why large parcels are not.
Because the whole thing scales, the cost of a lot being long rather than square is a fixed proportion at every acreage. A 2:1 lot always needs about 6% more fence than the square of the same area. A 3:1 lot always needs about 15% more. A 4:1 lot needs exactly 25% more — one extra side-length, every time, which is why the “+ft” figure in the chart's 4:1 column is always the same as the square's side.
So you do not need to know your exact dimensions to know roughly what shape is costing you. If your lot is about twice as deep as it is wide, add 6% to the square figure. If it is a long strip, add a quarter. Here is the whole spread for a single acre:
| Lot shape | Dimensions | Fence needed | Extra vs. square |
|---|---|---|---|
| SquareThe shape the usual answer assumes. | 209 × 209 ft | 835 ft | the usual answer |
| 3:2Slightly deeper than wide — common on newer plots. | 170 × 256 ft | 852 ft | +17 ft$310–947 installed |
| 2:1A typical suburban lot. | 148 × 295 ft | 885 ft | +51 ft$912–2,785 installed |
| 3:1Deep and narrow, common in older subdivisions. | 120 × 361 ft | 964 ft | +129 ft$2,325–7,103 installed |
| 4:1A long strip — a flag lot or an infill plot. | 104 × 417 ft | 1,044 ft | +209 ft$3,757–11,479 installed |
Cost column uses the verified installed range of $18–55 per linear foot for 6 ft wood privacy fence. National planning figures, not quotes.
Some of the larger rows land on suspiciously tidy figures, and they are not a coincidence. US land was surveyed in square miles, and the acre is a fraction of one, so the standard parcel sizes come out exact when they are square. Forty acres — the classic quarter-quarter-section — is 1,320 ft on a side, which is a quarter of a mile, making it precisely one mile around. Ten acres is 660 ft square, or half a mile around. A quarter section, 160 acres, is half a mile on a side and two miles around.
That is genuinely useful if you are buying fence for rural land, because agricultural fencing is quoted and sold by the rod, the roll and the mile rather than by the foot. A square forty needs one mile of wire; knowing that before you call is worth more than a per-foot figure.
A perimeter is not a shopping list, and this is where an acreage chart stops being the right tool. Four things change the number materially, and none of them are visible from the acreage:
Post depth, frost depth, height limits and setbacks are deliberately absent from this page and from every figure on this site. They vary by county and sometimes by street, and a plausible-looking default reads as a checked one. Your local building department will answer all four in a single phone call.
The installed range is $18–55 per linear foot for 6 ft wood privacy fence, collected 2026-09-16 from published national cost surveys and recorded with its sources rather than rounded into prose. It is wide because the real spread is wide: the same fence costs very different amounts in different metros, and a range that hid that would be less honest, not more precise.
It stops above 5 acres on purpose. The arithmetic would keep working — a rate times a length always returns something — but the product would be wrong. Ten acres does not get privacy fence; it gets field wire, at a small fraction of the price per foot. We have no verified rate for agricultural fencing, so rather than extrapolate one we leave those cells blank and say why. A blank is information. A confident wrong number is not.
If you already have a contractor's figure, the more useful exercise is checking what it includes: how to read a fence quote covers the lines that are usually missing.
Sources: https://homeguide.com/costs/wood-fence-cost · https://www.homewyse.com/services/cost_to_install_wood_privacy_fence.html · https://fenceadvisors.com/blog/fence-cost-per-foot-guide · https://latestcost.com/fence-price-per-linear-foot-real-costs-material-labor-region/
Seeded with the square-acre perimeter. Replace it with your own measurement — or with any row from the chart — and the posts, rails, pickets and concrete update with the working shown.
These are typical values, not requirements. Post depth in particular is governed by your local frost line and building code — check before you dig.
National planning ranges compiled from published US construction cost guides, last checked September 2026 (confidence: medium). Prices vary sharply by region, season and contractor. These are estimates for planning, not quotes.
Sources: homeguide.com, calcsummit.com, latestcost.com, angi.com, ergeon.com, homewyse.com, fenceadvisors.com
| Material | Size | Quantity |
|---|---|---|
| Posts | 4x4 | 106 |
| Rails incl. waste | 2x4 | 344 |
| Pickets incl. waste | 1x6 | 1,909 |
| Concrete mix | 177bags | |
| Gravel | 39bags | |
| Exterior screws | ≈12,300 | |
| Walk gate kit | 1 |