How many 6x8 fence panels for 100 ft?

Data checked October 2026

Short answer

A 100 ft run of 6×8 wood panels takes 13 panels and 14 posts, set with 56 bags of 50-lb Fast-Setting concrete.

13 panels (6×8 ft wood) on 8' post centers: 12 full panels and a 4' last section cut from one more panel.
14 posts — 12 line posts plus 2 end posts (13 sections). With a 4-ft gate in the run it becomes 14 posts, 2 of them gate posts; bent into a U of 25, 50 and 25 ft it takes 16 posts.
Buy 10-ft posts: a 6-ft fence buries 36 in (a third of the post) on 4 in of gravel, so it needs 9' — 8-ft posts would leave only 24 in in the ground.
Concrete: 56 × 50-lb Fast-Setting (4 per post, 0.66 yd³) — 2,800 lb to haul and about 56 gal of water.
Materials come to about $1,764 ($17.64/ft) at October 2026 prices, versus $1,500–$4,500 installed (Modernize, Aug 2026).
Panels sold as 6×8 carry 18 to 28 pickets of different widths and thicknesses, so compare picket count and thickness, not just price.

Adjust it to your exact job

Fence type

Style

6×8 ft pressure-treated panels hung between 4×4 posts. Posts are sold separately.

Height

Fence line100 ft total

Fence length

= 100' · 30.48 m

Gates

Walk gates

Double drive gates

You need

13wood panels

14 posts · 56 × 50-lb bags of concrete for 100' of fence

12 line2 end

Posts: 1412 line · 2 end
Sections: 13one panel each
Concrete: 56× 50 lb4 per line & end post
Post centers: 8'full panels; cut the last one on each side

Posts to buy

Posts by type
Post	Buy	Hole	Fill
Line × 12	4×4 × 10 ft	10 × 40 in	4 bags
End × 2	4×4 × 10 ft	10 × 40 in	4 bags

Each post goes 36 in into the ground on 4 in of gravel, so a 6-ft fence needs posts at least 9' long. Concrete stops 3 in below grade so soil or sod can cover it.

Concrete: 56 × 50-lb Fast-Setting

17.7 ft³ · 0.66 yd³

Counted hole by hole: 4 per line & end post. Dry-poured bags can't be split between holes, so each post rounds up.
Water: about 56 gal (1 gal poured over each 50-lb bag). Weight to haul: 2,800 lb.
Filling the hole to the top with no gravel or soil cap would take 5 bags per line post — that is why bag counts online disagree.
Wait 4 hours before hanging rails, panels or gates on the posts.
With 80-lb Concrete Mix instead: 42 bags, about $272 versus $446 — cheaper per yard, but it must be mixed first and cures for 24 hours.

Different hole size or a single post? Use the post hole concrete calculator.

These holes take more than 30 in of concrete. Quikrete says to dry-pour Fast-Setting in lifts: fill to 30 in or less, soak with water, then add the rest.

Before you dig

Call 811 (free) a few days ahead to have buried utilities marked. Confirm the property line and set posts a few inches inside it, and check permit, zoning and HOA height rules — front-yard limits are often lower than backyard ones. In cold climates, ask your building department for the local frost depth and enter it above — posts that stop short of it can heave.

Not all 6×8 panels are equal

Panels sold as 6×8 carry anywhere from 18 to 28 pickets of different widths and thicknesses. Compare picket count and thickness, not just price — and remember posts are sold separately.

Shopping list

14 posts 4×4×10 ft ground-contact PT posts12 line, 2 end$276
13 panels PT pine dog-ear privacy panels, 6 × 8 ftCut the last panel in each run to fit$1,001
56 bags Quikrete Fast-Setting Concrete Mix (No. 1004), 50 lb bags4 per line & end post$446
6 bags All-purpose gravel, 0.5 cu ft bags4 in drainage base under each post$41.70
78 pcs Fence panel brackets (or 3 in exterior screws)one at each rail end
14 caps Post capsoften forgotten — keeps water out of end grain

Estimated total$1,764

Cost estimate

Tap a price to use your store's

4×4×10 ft ground-contact PT posts
14 posts × $
$276
PT pine dog-ear privacy panels, 6 × 8 ft
13 panels × $
$1,001
Quikrete Fast-Setting Concrete Mix (No. 1004), 50 lb bags
56 bags × $
$446
All-purpose gravel, 0.5 cu ft bags
6 bags × $
$41.70

Materials total$1,764

Typical U.S. big-box prices, checked October 2026; posts and pickets are 2026 snapshots. Not in the total: fence panel brackets (or 3 in exterior screws), post caps.

Hiring it out instead?

Installed wood privacy fences run about $15–$45 per foot (Modernize, Aug 2026) — roughly $1,500–$4,500 for 100', against about $1,764 in materials above. Compare materials, gates and removal →

Did this answer your question?

Compare

100 ft of fence in every style

Style	Boards / panels	Posts	Concrete bags	Materials
Wood privacy, 6 ft	241 pickets	14	56	$1,585
Board-on-board, 6 ft	330 pickets	14	56	$1,788
Spaced picket, 4 ft	220 pickets	14	42	$1,049
Prebuilt wood panels, 6 ft	13 panels	14	56	$1,764
Vinyl privacy panels, 6 ft	13 panels	14	42	$2,458

How this was worked out

Panels: 100 ft ÷ 8' post centers = 12.5, rounded up to 13 panels. Posts = panels + 1 = 14 on a straight run.

Concrete per post: a 10-in hole has 78.5 sq in of area; minus the 3.5 × 3.5 in post leaves 66.3 sq in. Concrete fills 33 in (the 36-in embedment minus a 3-in soil cap): 66.3 × 33 ÷ 1,728 = 1.27 cu ft ÷ 0.375 cu ft per bag = 3.38 → 4 bags.

Prices used: 4×4×10 ft ground-contact PT posts $19.68; PT pine dog-ear privacy panels, 6 × 8 ft $76.98; Quikrete Fast-Setting Concrete Mix (No. 1004), 50 lb bags $7.97; All-purpose gravel, 0.5 cu ft bags $6.95. Tap any price in the calculator to use your store's.

The full method, material data and tips are on the main fence calculator page.

Similar jobs

Other sizes people check

Sources

Data behind this answer

The Home Depot — Do It Yourself Fence Installation sheet — posts ≤ 8 ft on center, 10 in holes, 4 in gravel, rails ≤ 24 in apart, 6 fasteners per picket, pickets 2 in off the ground · checked October 2026
Quikrete Fast-Setting Concrete Mix No. 1004 — data sheet (rev. Nov 2025) — 50 lb = 0.375 cu ft; hole 3× post width; fill to 3–4 in below grade; ~1 gal water per bag; lifts ≤ 30 in; 4 h before load · checked October 2026
Quikrete Concrete Mix No. 1101 — data sheet (rev. Oct 2022) — 80 lb = 0.60 cu ft; 6–9 pt water per bag; 24 h before strain · checked October 2026
Quikrete — Setting Posts in Concrete (how-to) — bury 1/3 of the post (= half the above-ground height) plus 6 in of gravel · checked October 2026
Western Red Cedar Lumber Association — fence specifications — 4×4 dresses to 3-9/16 in, 6×6 to 5-1/2 in · checked October 2026
Master Halco — Western Red Cedar fence boards — actual picket widths 3-1/2, 5-1/2 and 7-1/2 in · checked October 2026
Catalyst Fence — Privacy Vinyl Fence Kit instructions (rev. 1.25) — post centers = panel + post width; 10 in holes for 5×5; 6 in gravel; 2 in ground clearance · checked October 2026
Catalyst Fence — Newbury vinyl SKU pages (rev. 6/2026) — 6 and 8 ft panels on 5×5 posts; 97 in post centers (Premium LX); 108 in posts for 6×8 · checked October 2026
Catalyst Fence — Vinyl privacy & picket gate instructions — vinyl gate posts need a stiffener insert, sold separately · checked October 2026
CPSC — Safety Barrier Guidelines for Residential Pools (Pub. 362) — 48 in minimum height, 1-3/4 in / 4 in openings, 1-1/4 in chain-link mesh, 2 in bottom gap over grass · checked October 2026
Home Depot & Lowe's listings — PT posts, pickets and 6×8 panels (2026 snapshots) — 4×4×8 $11.18, 4×4×10 $19.68, 6×6×8 $37.68, pickets $2.28 PT / $3.96 cedar, PT panel $76.98 · checked October 2026
Home Depot — Veranda vinyl fence panels and posts (2026 snapshots) — 6×8 white privacy panel $119.47 typical; 5×5 posts $35.40–$62.99 · checked October 2026
Home Depot price history — Quikrete 50 lb Fast-Setting (Glassit tracker) — $7.97 per bag (Aug 2026); 80 lb Concrete Mix $6.47 (Sept 2026) · checked October 2026
Sakrete All-Purpose Gravel / Mulch Pros price list — 0.5 cu ft per bag; $6.95 per 0.5 cu ft bag (Oct 2026) · checked October 2026
Thompson's WaterSeal — Semi-Transparent Wood Sealer — 150–400 sq ft/gal; wait 30 days on new pressure-treated wood · checked October 2026
Ready Seal — FAQ — new pressure-treated wood: 1 month minimum, 2–3 months recommended before staining · checked October 2026
Minnesota Rules 1303.1600 — footing depth for frost protection — 60 in in Zone I (north), 42 in in Zone II (south) · checked October 2026
Modernize — Fence installation cost (updated Aug 12 2026) — installed $/ft by material, labor $5–15/ft, 150-ft totals · checked October 2026
Fixr — Wood, picket, chain-link and vinyl fence cost guides (Jan 2025) — $/ft by style and species, gates, removal $2–5/ft · checked October 2026

Short answer

A 100 ft run of 6×8 wood panels takes 13 panels and 14 posts, set with 56 bags of 50-lb Fast-Setting concrete.

13 panels (6×8 ft wood) on 8' post centers: 12 full panels and a 4' last section cut from one more panel.

14 posts — 12 line posts plus 2 end posts (13 sections). With a 4-ft gate in the run it becomes 14 posts, 2 of them gate posts; bent into a U of 25, 50 and 25 ft it takes 16 posts.

Buy 10-ft posts: a 6-ft fence buries 36 in (a third of the post) on 4 in of gravel, so it needs 9' — 8-ft posts would leave only 24 in in the ground.

Concrete: 56 × 50-lb Fast-Setting (4 per post, 0.66 yd³) — 2,800 lb to haul and about 56 gal of water.

Materials come to about $1,764 ($17.64/ft) at October 2026 prices, versus $1,500–$4,500 installed (Modernize, Aug 2026).

Panels sold as 6×8 carry 18 to 28 pickets of different widths and thicknesses, so compare picket count and thickness, not just price.

Adjust it to your exact job

Fence type

Style

6×8 ft pressure-treated panels hung between 4×4 posts. Posts are sold separately.

Height

Fence line100 ft total

Fence length

= 100' · 30.48 m

Gates

Walk gates

Double drive gates

You need

13wood panels

14 posts · 56 × 50-lb bags of concrete for 100' of fence

12 line2 end

Posts: 1412 line · 2 end
Sections: 13one panel each
Concrete: 56× 50 lb4 per line & end post
Post centers: 8'full panels; cut the last one on each side

Posts to buy

Posts by type
Post	Buy	Hole	Fill
Line × 12	4×4 × 10 ft	10 × 40 in	4 bags
End × 2	4×4 × 10 ft	10 × 40 in	4 bags

Each post goes 36 in into the ground on 4 in of gravel, so a 6-ft fence needs posts at least 9' long. Concrete stops 3 in below grade so soil or sod can cover it.

Concrete: 56 × 50-lb Fast-Setting

17.7 ft³ · 0.66 yd³

Counted hole by hole: 4 per line & end post. Dry-poured bags can't be split between holes, so each post rounds up.
Water: about 56 gal (1 gal poured over each 50-lb bag). Weight to haul: 2,800 lb.
Filling the hole to the top with no gravel or soil cap would take 5 bags per line post — that is why bag counts online disagree.
Wait 4 hours before hanging rails, panels or gates on the posts.
With 80-lb Concrete Mix instead: 42 bags, about $272 versus $446 — cheaper per yard, but it must be mixed first and cures for 24 hours.

Different hole size or a single post? Use the post hole concrete calculator.

These holes take more than 30 in of concrete. Quikrete says to dry-pour Fast-Setting in lifts: fill to 30 in or less, soak with water, then add the rest.

Before you dig

Not all 6×8 panels are equal

Panels sold as 6×8 carry anywhere from 18 to 28 pickets of different widths and thicknesses. Compare picket count and thickness, not just price — and remember posts are sold separately.

Shopping list

14 posts 4×4×10 ft ground-contact PT posts12 line, 2 end$276
13 panels PT pine dog-ear privacy panels, 6 × 8 ftCut the last panel in each run to fit$1,001
56 bags Quikrete Fast-Setting Concrete Mix (No. 1004), 50 lb bags4 per line & end post$446
6 bags All-purpose gravel, 0.5 cu ft bags4 in drainage base under each post$41.70
78 pcs Fence panel brackets (or 3 in exterior screws)one at each rail end
14 caps Post capsoften forgotten — keeps water out of end grain

Estimated total$1,764

Cost estimate

Tap a price to use your store's

4×4×10 ft ground-contact PT posts
14 posts × $
$276
PT pine dog-ear privacy panels, 6 × 8 ft
13 panels × $
$1,001
Quikrete Fast-Setting Concrete Mix (No. 1004), 50 lb bags
56 bags × $
$446
All-purpose gravel, 0.5 cu ft bags
6 bags × $
$41.70

Materials total$1,764

Typical U.S. big-box prices, checked October 2026; posts and pickets are 2026 snapshots. Not in the total: fence panel brackets (or 3 in exterior screws), post caps.

Hiring it out instead?

Style

Boards / panels

Posts

Concrete bags

Materials

Wood privacy, 6 ft

241 pickets

$1,585

Board-on-board, 6 ft

330 pickets

$1,788

Spaced picket, 4 ft

220 pickets

$1,049

Prebuilt wood panels, 6 ft

13 panels

$1,764

Vinyl privacy panels, 6 ft

13 panels

$2,458

How this was worked out

Panels: 100 ft ÷ 8' post centers = 12.5, rounded up to 13 panels. Posts = panels + 1 = 14 on a straight run.

The full method, material data and tips are on the main fence calculator page.