Barbed Wire Fence Rolls & Posts Calculator
Barbed wire fence calculator: rolls per acre, wire length and posts from your plot size. Use the free Barbed Wire Fence Rolls & Posts Calculator below — enter your values and get instant results, right in your browser. Perimeter (ft) = 2 × (length + width). Total wire (ft) = perimeter × strands. Rolls = total wire ÷ roll length. Posts = perimeter ÷ post spacing.
How to use the Barbed Wire Fence Rolls & Posts Calculator
Fencing a plot with barbed wire means buying two things in the right amounts: wire rolls and concrete or wooden posts. Too few rolls and the last side stays open; too few posts and the wire sags for cattle to push through. This barbed wire fence calculator takes your plot length and width, works out the perimeter, multiplies by your strand count for total wire, converts that into standard 1320-foot rolls, and spaces the posts at your chosen interval — the complete shopping list in one calculation.
- Enter the plot length and width in feet in their fields.
- Select the number of wire strands — 4 is standard for field fencing.
- Enter the wire length per roll (1320 ft is the common roll).
- Select the post spacing — 10 feet is typical.
- Click Calculate to see rolls, posts and total wire feet, then round up when buying.
Formula
Worked example
Frequently asked questions
A square acre has about an 835 ft perimeter; with 4 strands that is 3,340 ft of wire, or about 2.5 standard 1320-ft rolls — buy 3.
8 to 12 feet is standard for barbed wire; 10 feet suits most field fencing, 8 feet where animals push hard.
Four strands is standard for cattle fencing; use 5 strands for goats or where extra security is needed.