牛用フェンス計算ツール

A cattle fence calculator is really a corner and wire-tension calculator wearing a fence take-off's clothes. Perimeter fencing for cattle has to survive constant animal pressure, rubbing, and in many cases miles of boundary line, and the design that holds up under that load looks nothing like a residential yard fence. Four to six strands of high-tensile barbed wire strung between steel T-posts, anchored at every corner and gate by a heavy wood H-brace assembly, is the standard agricultural answer, and this calculator sizes exactly that: line posts, corner assemblies, total wire footage with a stretching margin, and the number of quarter-mile spools the run actually needs.

Corners do most of the structural work on a cattle line, which is why they get a disproportionate share of the material. A corner takes roughly 90 percent of the tension on a fence run, since every strand pulls against it from both directions, so it needs two or three heavy treated wood posts set in an H-brace with a horizontal compression timber and a diagonal tension wire, not a single post doing the job of an entire assembly. Skimping on corner bracing is the single most common failure mode in cattle fencing, and it shows up as sagging wire and leaning posts within a season or two rather than as an immediate collapse. Between corners, line posts are typically steel T-posts spaced at 10 to 16 feet depending on terrain and herd pressure, tighter in rough ground or high-traffic corrals, wider on flat open range where the wire itself carries more of the tension evenly.

Wire quantity and spacing both have standard figures worth knowing before ordering material. Five strands is the common default for a perimeter cattle fence, with four adequate for interior cross-fencing and six reserved for bulls or higher-pressure boundary lines; the top strand typically sits at 50 to 54 inches with the bottom strand 12 to 16 inches off the ground. Barbed wire ships in standard quarter-mile spools of 1,320 feet, and this calculator adds a margin, commonly around 5 percent, for splicing, end wraps and the extra length that terrain dips and rolls add to a straight-line measurement. That margin is the difference between ordering exactly enough spools and running short on the last stretch of a long pasture line.

Cattle fencing overlaps with other livestock fencing more than it differs from it, and several of the calculators on this site share the same corner-and-wire logic with different spacing and strand counts. The goat fence calculator uses woven wire instead of barbed strands because goats climb and push rather than just lean, while the horse fence calculator drops barbed wire entirely in favor of smooth rail or tape because barbs injure horses on routine contact. If deer pressure on the same pasture is also a concern, the deer fence calculator handles that separately at its own height. For wood-rail boundary sections rather than wire, the split rail fence calculator covers that take-off. The guide on horse and livestock fencing basics and the comparison of barbed wire versus woven wire for livestock both go deeper into choosing a wire type than a calculator alone can, and the piece on how far apart fence posts should be covers spacing tradeoffs that apply to T-posts as much as to wood posts.

Once the wire, post and corner counts are set, the remaining work is sizing posts correctly and budgeting the run. Run the numbers here alongside the fence post calculator for post depth and the fence perimeter calculator if the pasture boundary is irregular rather than a simple rectangle. The fence materials guide and property line and setback guide are both worth reading before fencing a boundary line specifically, since a cattle fence sits closer to legal property-line questions than a backyard fence usually does. The rest of the animal and livestock calculators, including goat, horse and deer fencing, are grouped under the animals category for side-by-side comparison.

Terrain changes the wire count more than most ranchers expect going in. A straight-line stretch of flat pasture uses close to the surveyed distance in wire, but rolling ground adds real footage with every dip and rise the line follows, and a run that crosses a creek bed or a gully needs extra slack or a dedicated water-gap design rather than a straight strand stretched tight across open space. This is part of why the stretching margin matters more on rough ground than on flat range, and why it is worth walking the actual fence line before ordering spools rather than relying on a straight-line map distance alone. Gate placement deserves the same on-the-ground check: a gate sized correctly on paper can still end up in the wrong spot if it does not account for how equipment and cattle actually move between pastures, so confirm gate width against the widest implement or trailer that will ever need to pass through before the corner posts go in the ground.