Fence Acreage Calculator
Start from your land, not a tape measure. Enter acres — or your lot's width and depth — to get the fence perimeter in linear feet, plus the posts, sections and gates to enclose it. That length flows straight into the material and cost calculators.
From acres to linear feet of fence
Fencing is priced and bought by the linear foot, but land is sold by the acre — and there is no single conversion between them, because area doesn't fix the perimeter. This calculator bridges the two: it turns an acreage into the perimeter of the most efficient (square) lot of that size, or takes your real width and depth for an exact number.
One acre is 43,560 square feet. As a square that's about 209 feet on a side, so a full enclosure is roughly 835 feet of fence. Double the land to two acres and the fence only grows to about 1,180 feet — perimeter rises with the square root of area, which is why bigger parcels get cheaper to fence per acre.
How much fence per acre (square lot)
| Acres | Side length | Perimeter to enclose |
|---|---|---|
| 1 acre | 209 ft | 835 ft |
| 2 acres | 295 ft | 1,181 ft |
| 5 acres | 467 ft | 1,868 ft |
| 10 acres | 660 ft | 2,640 ft (½ mile) |
| 40 acres | 1,320 ft | 5,280 ft (1 mile) |
Posts, gates and only fencing part of it
Once you have the perimeter, posts are just the run divided by your spacing. A full enclosure is a closed loop, so the posts wrap around without a spare end post; an open run along one or two sides adds a closing post. Set the sides to fence to 3, 2 or 1 when a road, a building, or a neighbor's fence already closes part of the boundary, and subtract each gate opening from the wire or board run.
Got your linear feet? Carry it into the fence material calculator for a full posts-rails-pickets take-off, the fence cost calculator for a budget and price per foot, or the post concrete calculator for bags of concrete.
Estimates only — verify boundaries with your plat or survey, and follow local code for setbacks and permits.
Frequently asked questions
How much fence do I need for 1 acre?
A square 1-acre lot is about 209 feet on each side, so a full enclosure is roughly 835 linear feet of fence. That is the minimum — the same acre stretched into a long, narrow lot can need well over 1,000 feet, because a square encloses the most area for the least perimeter.
Does the shape of my land change how much fence I need?
Yes, and by a lot. Acreage sets the area, not the perimeter. A square encloses the most land per foot of fence; the longer and thinner the lot, the more fence the same acreage requires. If you know your lot dimensions, enter width × depth for an exact perimeter instead of the square estimate.
How many posts do I need to fence an acre?
Divide the fenced length by your post spacing. A square acre (about 835 feet) at 8-foot spacing needs roughly 105 posts for a full enclosure; at 10-foot wire-fence spacing, about 84. Add a post for each gate and for any corner your spacing does not already land on.
How do I fence only part of my property?
Set the number of sides to fence to 3, 2 or 1 — useful when a road, a neighbor’s fence, or a building already closes one or more sides. The calculator scales the perimeter to just the sides you are building and adds a closing post, since the run is no longer a continuous loop.