Construction Calculators
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Fence Calculator
Calculate fence materials — posts, rails, pickets, concrete, and cost estimates for wood, vinyl, chain link, and aluminum fences.
Fence Material & Cost Calculator
Calculate posts, rails, pickets, concrete, and installation costs by fence type
Automate Your Takeoffs
BuildVision AI reads your site plans and calculates fencing materials, linear footage, and costs automatically from your drawings.
How to Calculate Fence Materials
Estimating fence materials starts with the total linear footage of your fence line. Measure the property boundary or desired fence path, then determine fence type, height, and post spacing to calculate all required materials.
Fence Posts
Divide total linear feet by post spacing (typically 8 feet for wood, 10 feet for chain link) and add 1 for the end post. Add extra posts for each gate. Each post needs 2 bags of concrete (80 lb) for the footing.
Rails and Pickets
Fences under 5 feet tall use 2 horizontal rails per section; taller fences use 3. For wood privacy fences, calculate pickets by dividing total inches of fence length by picket width (typically 5.5" for standard boards with no gap).
Fence Cost per Foot
| Type | Material/ft | Installed/ft |
|---|---|---|
| Wood Privacy | $8–$12 | $15–$25 |
| Chain Link | $5–$10 | $10–$20 |
| Vinyl | $12–$20 | $20–$35 |
| Aluminum | $15–$25 | $25–$40 |
Frequently Asked Questions
How many fence posts do I need?
Divide total fence length by post spacing (usually 8 feet) and add 1. For a 200-foot fence: 200 ÷ 8 + 1 = 26 posts, plus extra for gates.
How much does it cost to fence an acre?
A square acre has a perimeter of about 835 feet. At $15–$25 per foot installed for wood privacy fencing, expect $12,500–$21,000. Chain link is cheaper at $8,350–$16,700.
How deep should fence posts be?
Fence posts should be buried one-third of their total length. For a 6-foot fence, use 9-foot posts set 3 feet deep in concrete footings.
How the Fence Calculator Works
Posts drive everything else. Pick 8-foot spacing on a 6-foot wood privacy fence and you save lumber but tighten the panel layout; drop to 6 feet and the wind loads ease but post and concrete count climbs by 33 percent. Pressure-treated 4x4s in 2026 run roughly $13 to $18 each at most yards; a 60lb bag of premix is $5 to $7 and you usually need two per hole on a residential 6-foot fence.
Linear footage is the sticker on the bid; the real cost lives in the corners, gates, demo, terrain, and the call before you dig. Most jurisdictions require a 48 or 72-hour utility locate ticket through 811, and skipping it is how you replace a $200 service line and lose a day.
Fence math
- Line posts = ceil(run length / post spacing) - 1
- Total posts = line posts + corners + ends + gate posts
- Rails = fence sections x rails per section
- Pickets = run length / picket coverage
Estimating Steps and Checks
Walk and sketch each run
Tape every straight run separately. Mark corners, end posts, gate locations, and slope changes on a quick site sketch — those are the line items that drive cost.
Lock in style and spacing
A 6-foot dog-ear privacy fence usually goes 8 feet on center; a 4-foot picket can stretch to 8 feet but most installers default to 6 feet for a tighter-looking line.
Count posts first, then infill
Posts including end, corner, and gate. Then sections (post count minus 1 for a single run), pickets at coverage width, rails per section, and concrete bag count for footings.
Layer in the field cost
Demo and haul-off, root or rock contingency on wooded lots, slope adjustment for stepped or racked panels, and the dump fee. Labor is usually 50 to 65 percent of a residential installed price.
Common Checks
- Switching from 8-foot to 6-foot post spacing increases post and concrete cost by about a third without changing linear footage — confirm what the homeowner actually wants before pricing.
- Gate posts typically step up one size (4x4 to 6x6 on residential) and run double-deep footings; count them as separate line items.
- Watch out: vinyl panels do not cut down well, so a 70-foot run with a 4-foot end remainder usually buys a full panel and adds to waste.
- Field check: chain-link top rail is sold in 21-foot lengths and overlaps 6 to 8 inches per joint, so a 100-foot run needs 5 sticks, not 4.
Fence Calculator FAQs
How many posts do I need on a 100-foot run?
At 8-foot spacing on a single straight run, plan on 14 line posts plus an end post on each end — round up to 15 or 16 once you cut sections to fit the actual length. Add a post for every gate and corner.
How many concrete bags per fence post?
A 6-foot wood fence with a 9-inch diameter hole at 30-inch depth typically takes two 60lb premix bags. Tall fences, sandy soils, gate posts, or 12-inch holes can push it to three or four. Confirm against the manufacturer spec on vinyl and chain-link kits.
When should I bid 5 percent waste versus 10 percent or more?
Five percent on a straight run with consistent panel sizes. Ten percent or more if the lot has slope, curves, or you are cutting custom pickets to hide an uneven grade.
Why does a 4-foot gate cost as much as 12 feet of run?
A gate is a finished assembly: heavier posts, deeper footings, hinges, a latch, frame bracing, a drop rod on doubles, and 30 to 60 minutes of layout per opening. Picket count is small but labor and hardware land closer to a kit-built unit price.