Barbed Wire Fence Roll and T-Post Calculator
Calculate barbed wire rolls, T-posts and corner braces for a fence line from perimeter, post spacing and wire strands, with material totals.
How This Calculation Works
Post count equals the perimeter divided by the post spacing, rounded up, plus one for the closing post. Wire rolls equal the perimeter times the number of strands, divided by the roll length. Corner braces are one per corner, so a rectangular field needs four.
Field Calibration & Rate Reference Chart
| Area | Square feet | Acres | Square field side |
|---|---|---|---|
| 1,000 sq ft | 1,000 | 0.023 | 32 ft |
| 5,000 sq ft | 5,000 | 0.115 | 71 ft |
| 10,000 sq ft | 10,000 | 0.230 | 100 ft |
| 0.25 acre | 10,890 | 0.250 | 104 ft |
| 0.5 acre | 21,780 | 0.500 | 148 ft |
| 1 acre | 43,560 | 1.000 | 209 ft |
| 5 acres | 217,800 | 5.000 | 467 ft |
| 10 acres | 435,600 | 10.000 | 660 ft |
| 40 acres | 1,742,400 | 40.000 | 1,320 ft |
| 100 acres | 4,356,000 | 100.000 | 2,087 ft |
Common Questions
How many T-posts do I need per mile of fence?
At 12-foot spacing, a mile of fence needs about 440 posts, plus corner and brace posts. Closer spacing on uneven ground adds more. Always add one post to close the run.
How many rolls of barbed wire per mile?
A standard roll holds 1,320 feet, so a mile of single-strand fence needs four rolls. Multiply by the number of strands: a four-strand fence needs 16 rolls per mile. Add a little for ties and waste.
How deep should fence posts be set?
Set posts at least 2 feet deep, and 3 feet or more in sandy or wet soils. Deeper posts resist frost heave and livestock pressure. Brace corners and gates against the wire tension.
How many strands of barbed wire should I use?
Most cattle fences use four to five strands, with the spacing tighter at the bottom for calves. Sheep need more strands or woven wire. Match the strand count to the livestock.