Do I need to fence all four sides?

Often not. Where a neighbour already has a fence on a shared boundary, or where the house itself closes one side, you only pay for what you build. Measure the sides you actually need and enter those instead of the full perimeter.

How do I find my lot dimensions?

Your property deed, plat map, or county assessor record will have them. A tape measure along each boundary is more reliable than pacing it out, and it is worth doing before ordering anything.

Does the driveway change the number?

Yes. A driveway crossing the boundary becomes a gate opening, which removes fence but adds posts. Add it as a gate in the calculator rather than subtracting it from the length.

Fence Ledger

How much fencing do I need for a quarter acre?

A quarter acre is 10,890 square feet. That tells you how much ground you have and almost nothing about how much fence it takes to go around it.

If the lot is square

417 ft of fence

Most lots are not square. The table below shows what the other shapes need.

What the usual answer misses

Area and perimeter are not the same question. Two quarter-acre lots can differ by more than fifty feet of fence depending on how they are shaped — and the narrow, deep lots that differ most are exactly the ones common in older subdivisions.

Same acreage, five shapes

Fence needed for 0.25 acres at five lot shapes
Lot shape	Dimensions	Fence needed	Extra vs. square
SquareThe shape the usual answer assumes.	104 × 104 ft	417 ft	the usual answer
3:2Slightly deeper than wide — common on newer plots.	85 × 128 ft	426 ft	+9 ft$215–473 installed
2:1A typical suburban lot.	74 × 148 ft	443 ft	+25 ft$633–1,393 installed
3:1Deep and narrow, common in older subdivisions.	60 × 181 ft	482 ft	+65 ft$1,614–3,552 installed
4:1A long strip — a flag lot or an infill plot.	52 × 209 ft	522 ft	+104 ft$2,609–5,740 installed

Cost column uses the site's verified installed range of $25–55 per linear foot for wood privacy fence. Ranges are national planning figures, not quotes.

Work out your own

Every assumption above is editable. Change the length, the spacing, the hole size — the numbers and the working update as you go.

Units

Shape

Fence length

Height

Gates

Advanced options

These are typical values, not requirements. Post depth in particular is governed by your local frost line and building code — check before you dig.

Post spacing

Gate width

Picket gap

Hole diameter

Hole depth

Gravel base

Bag yield

Waste allowance

Posts

Sections

Pickets

949

Concrete

90 bags

Estimated cost

Materials only (DIY)

$3,536 – $8,940

Professionally installed

$10,625 – $23,535

National planning ranges compiled from published US construction cost guides, last checked September 2026 (confidence: medium-low). Prices vary sharply by region, season and contractor. These are estimates for planning, not quotes.

Sources: homeguide.com, calcsummit.com, angi.com, ergeon.com, homewyse.com

Shopping list

Bill of materials for this fence
Material	Size	Quantity
Posts	4x4	54
Rails incl. waste	2x4	172
Pickets incl. waste	1x6	949
Concrete mix		90bags
Gravel		20bags
Exterior screws		≈6,200
Walk gate kit		1

Why these numbers

How we got the section count

Run 1: 413 ft ÷ 8 ft = 51.63, rounded up to 52 sections

How we got the post count

3 posts are fixed by the shape itself
2 at the open ends
1 carrying a gate
51 line posts spaced between them
54 posts in total

How we got the picket count

Each picket covers 5.5 in plus a 0.25 in gap, so they repeat every 5.75 in
413 ft of fence needs 862 pickets
Plus 10% for offcuts, rounded up to 949

How we got the concrete

Each 10 in hole is 30 in deep, less 4 in of gravel base, leaving 26 in of concrete
The 4x4 post itself takes up part of that, so each hole needs the remainder
Across 54 posts
Divided by the 0.6 cu ft a bag yields: 89.77, so buy 90 bags

Common questions

Do I need to fence all four sides?: Often not. Where a neighbour already has a fence on a shared boundary, or where the house itself closes one side, you only pay for what you build. Measure the sides you actually need and enter those instead of the full perimeter.
How do I find my lot dimensions?: Your property deed, plat map, or county assessor record will have them. A tape measure along each boundary is more reliable than pacing it out, and it is worth doing before ordering anything.
Does the driveway change the number?: Yes. A driveway crossing the boundary becomes a gate opening, which removes fence but adds posts. Add it as a gate in the calculator rather than subtracting it from the length.