How Far Apart Should Fence Posts Be? Spacing Guide by Fence Type

Spacing is the decision that sets your material list, your labor hours, and whether the fence sags in five years. How far apart should fence posts be depends on what the fence is made of, how much wind or tension it carries, and what the ground does between the two ends of the run. This guide gives the on center standard, spacing by fence type, how to adjust for terrain, and how to count posts before you buy anything. It is the companion piece to our fence post depth guide, which covers how far down each of those posts needs to go.

What "on center" means, and why it matters

Fence spacing is always measured on center, meaning from the middle of one post to the middle of the next, not from the inside face of one to the inside face of the other. Measuring edge to edge instead will leave you short by the width of a post on every single bay, which turns into several feet of error over a long run and a rail that will not reach.

Run a string line between the two end posts, mark every post center along it, and check your marks against the total run length before you dig. Adjusting a mark takes seconds. Adjusting a set post takes a day.

Fence post spacing by fence type

• Wood privacy fence. 6 to 8 feet on center. Six feet is the safer default in windy areas and for 8 foot tall panels, because a solid privacy panel is a sail and every extra foot of span increases the load on the post.
• Picket and garden fence. 6 to 8 feet on center. Preassembled panels dictate the spacing, so measure a panel and lay out to it rather than the other way around.
• Chain link. Up to 10 feet on center, which is the common maximum in most residential codes. The fabric passes wind rather than catching it, so the posts carry less load per foot of span.
• Vinyl and composite. Whatever the manufacturer specifies, usually 6 or 8 feet, because vinyl rails are engineered for an exact span. Deviating from spec voids most warranties.
• Ranch rail and split rail. 8 to 10 feet, set by the rail length. Rails typically come in 8, 10, or 11 foot lengths and must land on post centers.
• Woven wire and field fence. 10 to 16 feet on center in flat, consistent ground, with shorter spacing where the terrain rolls.
• High tensile wire. 16 to 20 feet or more between line posts, with droppers or stays between them to keep wire spacing consistent. The tension in the wire, not the posts, holds the geometry.
• Electric fence, temporary or rotational. 20 to 50 feet with step in posts.

Adjusting spacing for terrain

A spacing number assumes flat, uniform ground. Real fence lines rarely cooperate.

• Slopes. Spacing is measured horizontally, not along the surface. On a grade, the distance you pace off along the ground is longer than the true on center distance, so tighten spacing on any meaningful slope or your panels will not fit.
• Crests and dips. Put a post at the top of every rise and the bottom of every hollow. Skipping this is what creates a fence that floats above the ground in one spot and buries itself in another.
• Corners and direction changes. A post at every change of direction, no exceptions, and it is a corner post rather than a line post.
• Soft ground and wind exposure. Reduce spacing. On an open ridge, dropping a solid panel fence from 8 feet to 6 feet on center is the cheapest structural upgrade available.

How to calculate your post count

1. Measure the total run in feet. Walk it with a wheel or pull a tape, following the actual fence line including every corner.
2. Divide by your spacing. A 200 foot run at 8 foot spacing is 25 bays.
3. Add one. Every run needs a post at both ends, so 25 bays needs 26 posts. This is the step people skip.
4. Add a post for every corner and direction change. Corners are not line posts and should be counted separately, and sized up.
5. Add two posts per gate. Gate posts are always their own line item and should be heavier than the line posts around them.
6. Even out the bays. If 200 feet at 8 foot spacing leaves an awkward 3 foot bay at the end, use 7 foot 2 inch spacing across 28 bays instead. Even bays look intentional; one short bay looks like a mistake.
7. Add 5 to 10 percent for breakage. Posts split, holes hit rock, and layouts change on site.

Sizing the auger to the spacing plan

Once the layout is set, the hole is the next constraint. A common guideline is a hole roughly three times the width of the post, so:

• 4x4 wood line post. 10 to 12 inch auger bit.
• 6x6 wood corner or gate post. 14 to 18 inch bit.
• 2 to 2.5 inch steel chain link post. 8 to 10 inch bit for line posts, 10 to 12 for terminals.
• Round wood ranch post, 4 to 5 inch. 10 to 12 inch bit.

Match the drive unit to the machine before you match the bit to the post. Auger drives are rated by hydraulic flow and torque, and an undersized drive will stall in a 12 inch hole in clay all day long. Skid steer auger drives and bits cover the standard and high flow range, with mini skid steer augers for backyard access and excavator auger drives where you need reach over a ditch or a slope. Check the carrier against your gate widths too, using skid steer weight and dimensions.

When to drive posts instead of digging them

Wide spacing and long runs are where post drivers earn their keep. Agricultural fence at 16 to 20 foot spacing over half a mile means hundreds of posts and no concrete, and a hydraulic driver sets them at a pace no auger and concrete crew will match. Because the driver compacts undisturbed soil around the post instead of backfilling a hole, the post also resists lateral pull well, which matters when the wire is under tension.

• Drive line posts on long agricultural, wire, vineyard, and orchard runs.
• Auger and set corners, ends, gates, and brace assemblies, which carry unbalanced load.
• Drive on slopes with an excavator mounted driver when a wheeled machine cannot hold the line safely.

See the full range of skid steer post drivers, and if the project also involves burying wire or irrigation along the fence, our overview of what a trencher is and how it works covers running that in the same pass.

Shop augers and post drivers

Frequently Asked Questions

How far apart should 6 foot fence posts be?

For a 6 foot wood privacy fence, space posts 6 to 8 feet apart on center. Use 6 feet in windy areas, with 8 foot tall panels, or where the fence is fully solid, and 8 feet where the fence is sheltered and the panels allow it.

How far apart should chain link fence posts be?

Chain link line posts are typically spaced up to 10 feet apart on center, which most residential codes set as the maximum. Terminal, corner, and gate posts are larger diameter and set independently of that spacing.

How far apart should fence posts be for wire fence?

Woven wire and field fence line posts usually sit 10 to 16 feet apart, and high tensile wire can stretch to 16 to 20 feet or more with droppers between posts. Tighten spacing on rolling ground and wherever the wire changes direction.

How do I calculate how many fence posts I need?

Divide the total run length by your spacing to get the number of bays, then add one post because every run needs both ends. Then add a post for each corner or direction change, two per gate, and 5 to 10 percent extra for breakage.

Does fence post spacing change on a slope?

Yes. Spacing is measured horizontally, so the distance along a sloped surface is longer than the true on center measurement. Tighten spacing on grades, and always place a post at the top of a rise and the bottom of a dip.