T Post Fence Calculator
Estimate T-posts, anchor posts, spacing, gate openings, slope-adjusted wire length, clips, roll count, embed depth, and above-ground post height for field, livestock, garden, and perimeter fences.
▣Fence Presets
Choose a realistic layout, then adjust the dimensions, openings, anchors, and terrain for your site.
⚙Fence Layout Inputs
Fence Material Estimate
▦Material and Spec Grid
☰T-Post Spacing Reference
| Fence Condition | Common T-Post Spacing | Use Shorter Spacing When | Anchor Notes |
|---|---|---|---|
| 3 or 4 strand barbed wire | 10 to 12 ft | Heavy stock pressure, dips, or curves | Brace ends, corners, and long pulls |
| Field fence or cattle woven wire | 8 to 10 ft | Rolling ground or mesh needs flatter line | Use strong braces before tensioning |
| Goat, sheep, dog, or welded wire | 6 to 8 ft | Small animals push under or against mesh | Brace each gate and corner separately |
| Horse woven or no-climb fence | 8 ft | High visibility, top rail, or safety line | Keep mesh smooth and well supported |
| High tensile electric fence | 20 to 30 ft | Uneven ground or more animal pressure | Insulated strainers need braced ends |
| Deer, orchard, or tall exclusion fence | 8 to 10 ft | Wind exposure or tall mesh panels | Tall systems need stout end assemblies |
⚒Post Height and Embed Reference
| Post Length | Common Embed | Available Above Grade | Typical Fence Match |
|---|---|---|---|
| 5 ft T-post | 16 to 18 in | 42 to 44 in | Garden, electric, or low utility fence |
| 5.5 ft T-post | 18 to 20 in | 46 to 48 in | 48 in field or welded wire |
| 6 ft T-post | 18 to 24 in | 48 to 54 in | Barbed wire or 48 in mesh with reveal |
| 6.5 ft T-post | 20 to 24 in | 54 to 58 in | 60 in horse or tall livestock fence |
| 8 ft T-post | 24 to 30 in | 66 to 72 in | Tall wildlife or orchard fence support |
| 10 ft T-post | 30 to 36 in | 84 to 90 in | Deer fence when extra height is needed |
▤Fence Type Reference
| Fence Type | Wire Lines or Mesh | Typical Roll Length | Default Clip Count |
|---|---|---|---|
| 3-strand barbed wire | 3 separate strands | 1320 ft spool equivalent | 3 clips per line post |
| 4-strand barbed wire | 4 separate strands | 1320 ft spool equivalent | 4 clips per line post |
| Field fence | Woven mesh plus optional top wire | 330 ft roll | 5 clips per line post |
| Horse woven wire | No-climb mesh plus top support | 100 or 200 ft roll | 6 clips per line post |
| High-tensile electric | 5 smooth electric wires | 1320 ft spool equivalent | 5 insulators or ties per post |
| Deer or orchard fence | 96 in mesh or stacked rolls | 100 or 330 ft roll | 8 clips per line post |
▥Brace and Gate Station Reference
| Station | Count Method | Post Impact | Wire Impact |
|---|---|---|---|
| Outside corner | Count every direction change | Usually one strong anchor post | Wire continues around or terminates by plan |
| Run end | Two per isolated straight run | Brace before line-post spacing begins | Full run length is tensioned between ends |
| Inline pull brace | Add on long runs or grade breaks | May add brace posts without changing spacing | Useful for tensioning and repairs |
| Single gate opening | Two posts per gate | Hinge and latch anchors are not line posts | Clear opening is subtracted from wire |
| Double gate opening | Still two side anchors | May need heavier hinge side bracing | Use full clear width as the opening |
ℹFence Planning Notes
In this case, there’s a line on the ground (a line of T-posts and wire). It is straight line unless you attempt to follow it. Most projects go south here. Wasted wire. Extra clips. Bent-up posts costs you time and frustration as you get the line back up to shape. Save yourself more than money by getting it right before first post goes in the ground. You’ll save an afternoon that would of been spent fixing layout if you realized your spacing was too tight to keep line from sagging.
After describing your terrain and perimeter the math happens for you. It’s more than just dividing by number of posts per foot. It’s also considering the relationship between those posts and corners, and gates, and slopes. Your fence description include the kind of tension you’re expecting to see. High tensile electric strands behave different than woven mesh, which in turn behaves differently than barbed wire.
How to Calculate Your Fence Needs
Four strand barbed wire might be able to handle a 12-foot spread under normal circumstances. But a gap tightened down to eight feet can keep wires from bowing out when an animal leans on it, especially where there is heavy livestock pressure or rolling hills.
The second is spacing, which people screw up the most. When buying posts they go with straight-line estimate and don’t account for their anchor stations. Each long pull requires a brace assembly. Each corner and gate also requires one. That assembly must be structurally independent from the line posts. That’s because not only do those anchor points hold the wire; they also takes the tension load off the line posts to allow them to maintain the wire at the proper level.
If you are going with all-steel T-posts for your corners rather than pipe or wood, the calculator factors in additional steel required at these stress points. It is a small distinction, but it makes big difference in how many posts you end up having to buy altogether.
The other big factor is slope. Sure, it might only be 100’ across horizontally but if it rises twenty percent, you’re going to require additional wire along the vertical axis different than indicated by the map. The tool will automaticly adjust for this change in elevation. There’s no need for calculating the hypotenuse by hand. It also accounts for an allowance in the terrain itself. Curves and all those pesky irregularities can add up. Tack on another 10-15% for layout complexity and waste so you don’t come up short part-way down the ridge.
It’s also important to consider post height and embed depth. You don’t want too much buried, or it won’t stand up to animals or wind pressure. You also don’t want it too high above the ground or it won’t work well or will look bad. For instance, an eighteen inch embed with a six foot post leaves only forty-two inches of usable fence height. It is fine for most sheep or cattle applications. But if you’re fencing deer and need eighty-four inches of clearance, you can’t simply go deeper and deeper forever. The physics of leverage and how much weight the soil can hold change. This relationship is checked by the calculator to alert you if you’ve selected a post length with too little down below or too much above.
Small things can cause big delays. I know, it’s tempting to pinch pennies on this one. But a missing clip can turn into a whole section of wire pulled down to the mud to get your clip back. Ten percent spare allowance isn’t wasteful. It’s insurance. It is against broken fasteners, rocky soil and all the other things that go wrong during an install. Keep in mind that we’re basing our numbers on ideal conditions, so when you see what comes out the end, remember, there will be some kind of friction involved in the real world. Take it as a solid baseline for shopping lists, then round up by a couple more clips and posts just in case.
Tension and geometry are key to fencing. Respect the slope, make sure your braces is solid at each end, and if you space the posts correctly the wire will be taut without much effort. Rushing the layout leads to chasing a few stray strands around for years. Get the starting numbers down solid and the fence holds itself up to anything that wants to come through it.
