How many fence posts do I need?

Divide the fence length by the post spacing (8 feet for wood and vinyl, 10 for chain link), round up, and add one to close the run. Then add two posts per gate and one per corner. A 150 foot privacy fence with one gate and three corners is 25 posts. The gate and corner posts are the ones most people forget.

How deep should fence posts be?

One-third of the post length in the ground, or 6 inches below the local frost line, whichever is deeper. For a 6 foot fence in a 36 inch frost zone that is about 3.5 feet of hole. Set posts shallower than the frost line and they heave a little each winter until gates bind and the line goes wavy.

How many pickets do I need for a privacy fence?

Privacy pickets butt edge to edge with no gap at a 5.5 inch actual face, so a foot of fence takes about 2.2 pickets. A 150 foot run is roughly 360 pickets with 10 percent waste. A spaced picket fence with a 2.5 inch gap uses fewer, about 1.5 pickets per foot.

How tall does a pool fence have to be?

At least 48 inches (4 feet) tall, with a self-closing, self-latching gate whose latch sits 54 inches off the ground, per IRC Appendix G. Pool fencing is a life-safety item, not a privacy choice. Check the pool box above and the calculator flags the requirements; verify the details with your local building department before building.

MATERIALFOREMAN · SHEET F-001 · EXTERIOR WORKS

CALC-001 · DRAWING NO. F-001 · REV A

Fencing calculator.

Drafted to scale · cited sources · honest numbers

Enter total fence length, height, and type. The calculator returns post count, rails, pickets (or rolls/panels), and a material-cost range. Accounts for gates, corners, and post spacing by fence type.

◈ DRAFTING PANEL · FENCING TAKEOFF · N.T.S. SHEET F-001 · REV A

Redline · scope notice Material count for level ground. Does not calculate post footing concrete, fastener counts, or slope adjustments. Stepped and racked fencing affect post lengths and bottom gap. Pool enclosures are life-safety code: verify with local AHJ.

Note 01 · Field Procedure

How to measure the fence line

Mark the fence line with stakes and string. Measure total length in feet. Include all straight runs and turns. A tape measure or wheel is accurate; pacing is not.
Decide fence height. Standard privacy fence is 6 ft. Picket fences run 3-4 ft. Pool enclosures require 48 in. minimum (IRC Appendix G / AG105).
Count gates: each gate needs two dedicated posts. Count corners: each 90-degree turn needs a terminal post. Both add to the post total beyond the line-post formula.
Call 811 before digging. Free utility locating is required by law in all 50 states. Wait for the locate markings before setting posts.

Note 02 · Equation

The formula

posts = ⌈L ÷ spacing⌉ + 1 + 2G + C

Ltotal fence length in feet

spacingpost spacing: 8 ft wood/vinyl, 10 ft chain link

Ggate count (2 posts per gate)

Ccorner count (1 terminal post each)

Wood pickets use 5.5 in. actual face width, not 6 in. nominal. Privacy fence: 0 gap. Picket fence: 2.5 in. gap. Post counts in the ranges below are line posts for a straight run: add 2 posts per gate and 1 per corner.

Note 03 · Sanity Ranges

Fencing by project size

T	Use case	Notes
~50 lf	Side yard / garden enclosure	7-8 posts. Weekend project for one person.
~100 lf	Backyard privacy fence	13-14 posts. Most common residential job.
~200 lf	Full perimeter, quarter-acre lot	26-27 posts. Budget for post-hole auger rental.
~500+ lf	Acreage / farm fence	60+ posts. Consider tractor-mounted auger and bulk material pricing.

Note 04 · References

Sources

Authorities cited on this sheet

ASTM F567-23: Standard Practice for Installation of Chain-Link Fence · Specifies maximum 10 ft post spacing for residential chain-link fencing. Defines terminal post (end, corner, gate) vs. line post requirements.
IRC Appendix G / ISPSC: Swimming Pool Barriers · Pool barrier requirements: 48 in. minimum height, self-closing/self-latching gate with latch 54 in. from ground. Appendix G adopted by local jurisdiction. Life-safety code.
Call Before You Dig (811) · National utility-locating service. Required by law in all 50 states before digging post holes. Free for homeowners. 2-3 business day lead time.

Note 05 · Field Manual

What the sheet count does not tell you

A 150-foot privacy fence, worked out

Take a 150 foot backyard privacy fence, 6 feet tall, with one gate and three corners. Posts go in at 8 foot spacing, so the run is 19 sections, which is 20 line posts. Add two posts for the gate and one for each corner and the order is 25 posts. At 6 feet tall the fence carries three rails per section (top, middle, bottom), which is 57 rails. Privacy pickets butt edge to edge with no gap at a 5.5 inch actual face, so 150 feet of run takes about 360 pickets after 10 percent waste. Materials land between roughly 1,500 and 3,750 dollars depending on the wood, before concrete and fasteners.

Posts, gates, and corners

The post count is where fence orders go wrong. A straight run needs one post per section plus one to close the end, so a 19-section fence has 20 line posts. Every gate adds two dedicated posts, one to hang on and one to latch against, and a gate post is heavier than a line post because it carries the swinging load. Every corner adds a terminal post where the fence changes direction. Chain link makes the same distinction in steel: terminal posts at ends, corners, and gates are a heavier gauge than line posts, which is why the parts list breaks them out. Count the gates and corners before ordering, because the line-post formula alone always comes up short.

Post depth, footings, and 811

This calculator counts the parts above ground. Two things below ground decide whether the fence stands. First, post depth: the rule of thumb is one-third of the post length in the hole, or 6 inches below the local frost line, whichever is deeper. In a 36 inch frost zone that is roughly 3.5 feet of hole for a 6 foot fence. Frost heave lifts shallow posts a little every winter until the gate stops latching. Second, the concrete: a fence post wants a footing of concrete, not dirt tamped back in, and that volume is a separate takeoff. Before any of it, call 811. Free utility locating is required by law in all 50 states, and the locate takes two to three business days, so make the call before the auger shows up.

Note 06 · Common Questions

Common questions

How many fence posts do I need?: Divide the fence length by the post spacing (8 feet for wood and vinyl, 10 for chain link), round up, and add one to close the run. Then add two posts per gate and one per corner. A 150 foot privacy fence with one gate and three corners is 25 posts. The gate and corner posts are the ones most people forget.
How deep should fence posts be?: One-third of the post length in the ground, or 6 inches below the local frost line, whichever is deeper. For a 6 foot fence in a 36 inch frost zone that is about 3.5 feet of hole. Set posts shallower than the frost line and they heave a little each winter until gates bind and the line goes wavy.
How many pickets do I need for a privacy fence?: Privacy pickets butt edge to edge with no gap at a 5.5 inch actual face, so a foot of fence takes about 2.2 pickets. A 150 foot run is roughly 360 pickets with 10 percent waste. A spaced picket fence with a 2.5 inch gap uses fewer, about 1.5 pickets per foot.
How tall does a pool fence have to be?: At least 48 inches (4 feet) tall, with a self-closing, self-latching gate whose latch sits 54 inches off the ground, per IRC Appendix G. Pool fencing is a life-safety item, not a privacy choice. Check the pool box above and the calculator flags the requirements; verify the details with your local building department before building.

PROJ MATERIALFOREMAN

SHT F-001 / 014

REV A · 2026-06-07

DRAWN MF