How much fence ten acres take
Ten acres are 435,600 square feet, and as a square that comes out neatly: 660 ft on each side and 2,640 ft of fence, exactly half a mile. As a 2:1 rectangle, 933.4 by 466.7 ft, the same ten acres take 2,800 ft, 160 ft or 6% more.
Perimeter = 4 × √(acres × 43,560 sq ft) for a square; add about 6% for a field twice as long as it is wide
How many T-posts to fence 10 acres?
For barbed wire with T-posts every 12 ft, the low end of the University of Kentucky's 12 to 14 ft range for barbed wire, the square ten acres with one 12 ft drive gate needs 236 T-posts, including 10% extra. Spacing moves that number a lot:
| T-post spacing | T-posts, square 10 acres |
|---|---|
| 12 ft | 236 |
| 14 ft | 206 |
| 16 ft | 180 |
| 25 ft (high tensile) | 113 |
| 40 ft (electric) | 71 |
NRCS California allows up to 15 ft between posts for a fence of 4 or more wires without stays, and 20 ft with one stay between posts. Its minimum T-post is 1.33 lb per foot and 5.0 ft long, driven 16 in for a fence with a 42 in top wire. The 2:1 field takes 251 T-posts at 12 ft.
Brace assemblies on ten acres
Steel posts carry the wire; wood assemblies at the ends hold the tension. Kentucky braces a run up to 165 ft with a single H-brace and up to 660 ft with a double H-brace at each end, and adds a braced pull post every 660 ft beyond that. Every side of the square ten acres is exactly 660 ft, so each corner gets a double H-brace facing both ways and no pull posts are needed. With the gate, that is 26 wood posts: 4 corners, 2 gate posts and 20 brace posts, plus 20 brace rails.
The 2:1 field needs 29 wood posts. Its long sides are 933 ft, so the one without the gate gets a pull post in the middle, braced on both sides. The University of Georgia puts braced line assemblies "every 650 ft", 10 ft shorter than Kentucky's, so under its rule even the 660 ft sides of the square would get a pull post.
Cost to fence 10 acres for cattle
Kentucky puts cattle fence at three to five strands of barbed wire, and NRCS California's livestock fence has its top wire at least 42 in and its bottom wire at least 14 in off the ground. For 5 strand barbed wire around the square, the calculator counts:
- 2,628 ft of fence and 14,454 ft of wire with waste, 11 rolls of 1,320 ft
- 236 T-posts and 26 wood posts
- $3,440 to $16,370 installed, from HomeAdvisor's and Fixr's per foot ranges plus $150 to $600 for the gate
Four strands take 9 rolls at the same installed price range, because the cost guides give one per foot range for barbed wire. Iowa State University Extension's 2024 budget, which prices materials and labor at $20 an hour for an Iowa fence, gives $1.16 per foot for 5 strand barbed wire. At that rate the 2,628 ft would come to about $3,050, close to the bottom of our range.
The electric row is the cheapest start for cattle at $2,780, but the same national guides give electric fence the same $6 per foot top as barbed wire, so its range is wider, not lower. High tensile has the tightest range, $3,300 to $7,170, and Iowa State prices it at $0.92 per foot as a non-electric fence and $1.22 electrified.
What else to plan for
- Gates: HomeAdvisor gives $150 to $600 for a livestock gate. Add one per field you will move cattle through.
- Cross fences: splitting the square into two five acre paddocks adds one 660 ft side, which is exactly one double braced run.
See the 20 acre page for where pull posts start to add up, the barbed wire calculator for strand by strand counts, and the fence cost calculator to compare fence types by price. The fence calculator covers the rest.