Fence Calculator

The fence calculator answers the planning question every homeowner and contractor asks: how many posts, panels, gates and bags of concrete do I need for this project? Enter your total linear feet (the total length you walk along the property line you want to fence), pick a post spacing that matches your material and load conditions, and the calculator computes posts, panels, concrete bags, gate count and total cost. The formula accounts for the end post (always 1 extra beyond the simple division), gate posts (2 extra per gate for the hinge and latch posts), and corner posts (1 extra per direction change). Use it for residential backyards, garden boundaries, farm and ranch fencing, commercial property lines, pool enclosures and driveway gates. For irregular yards, measure each straight section separately and sum the linear feet before entering the total.

Step 1: Measure total linear feet. Walk the property line with a measuring wheel and record every straight section. For a 60 × 80 ft rectangular backyard fenced on three sides: 60 + 80 + 60 = 200 linear feet. Step 2: Count posts. Posts = ceil(linear feet ÷ post spacing) + 1 + (gates × 2) + corners. For 100 ft with 8 ft spacing and 1 gate: ceil(100/8) + 1 + 2 = 16 posts. Step 3: Count panels. Panels = ceil((linear feet − gate openings) ÷ panel length). For 100 ft with one 4 ft gate and 8 ft panels: ceil(96/8) = 12 panels. Step 4: Concrete bags. Bags = posts × 2 for standard 4×4 in posts at 36 in depth. 16 posts × 2 = 32 bags. The calculator above does all four steps automatically and shows results including total cost with optional installation labor.

Fence posts are the structural backbone of any fence — get the count wrong and panels won't fit. Standard residential post spacing is 8 feet (2.44 m) center-to-center for wood, vinyl and chain link in average wind conditions. Use 6 ft spacing for tall privacy fences (8 ft tall panels), heavy-duty windy sites or weak soils. Use 10 ft spacing for ranch and farm fencing where loads are minimal. The end post adds +1 to the count: a 24 ft section with 8 ft spacing needs 4 posts (not 3), because both ends need anchoring. Gates add +2 posts each — the hinge post and latch post must be sturdier than regular fence posts and are typically set deeper (extra 6-12 inches) with more concrete. Corner posts add +1 per direction change. Pool fences typically require 6 ft spacing to meet building code stiffness requirements. The calculator computes all four components (linear, end, gate, corner) automatically.

Panel count depends on material type and panel length. Wood and vinyl fence panels are typically 8 feet long (2.44 m); some vinyl manufacturers offer 6 ft panels for height variation. Chain link doesn't use rigid panels — it's sold as a continuous mesh roll, typically 50 ft (15.24 m) long, and supported by tension wires between posts. Aluminum and composite panels match wood/vinyl at 8 ft standard. Panel formula: panels = ceil((linear feet − gate openings) ÷ panel length). Always round up — partial panels aren't sold and field-cutting reduces panel strength. Order 5-10% extra for damaged boards, miscalculations and future repair stock. Store spare panels protected from weather and direct sunlight to prevent UV damage and warping.

Post depth must reach below the frost line — the maximum depth the ground freezes in winter — to prevent posts from heaving (lifting) when ice expansion pushes them up. Frost line varies dramatically by region. United States: Florida 0 in; Texas 6 in; Georgia 8 in; Tennessee 12 in; Ohio 32 in; Illinois 40 in; Minnesota 60 in; Maine 60 in. Canada: Toronto 48 in (122 cm); Vancouver 18 in (no deep frost); Calgary 84 in (213 cm — Alberta freezes hard). United Kingdom: 450 mm (18 in) typical per BS 1722 — UK frost is moderate. Australia: no significant frost line in most of the country, but AS 1725 requires minimum 600 mm (24 in) for general post stability. Always verify with your local building department — counties publish exact frost depth for permit applications. A 6 ft tall fence with posts at only 12 in depth will lean within 2-3 seasons in any climate.

Concrete footings anchor posts in the ground and resist wind and gate loads. Standard rule: 2 × 50 lb (22.7 kg) bags of pre-mixed concrete per post for a 4 × 4 in (10 × 10 cm) wood post in a 10 in (25 cm) diameter hole at 36 in (91 cm) depth. Larger 6 × 6 in posts in 12 in diameter holes need 3 bags. Heavy gate posts (especially driveway gates) need 3-4 bags each. For 16 fence posts at 2 bags each: 32 bags total. Pre-mixed concrete brands: Sakrete and Quikrete (US/CA), Blue Circle and Hanson (UK), Boral (AU). Mix the concrete in the hole with the post in place — the 'no-mix' method works but takes longer to cure (24-48 hours vs 8-12 hours for mixed concrete). Use the calculator's concrete output to plan your trip to the home center. See our dedicated concrete calculator for non-fence projects (slabs, foundations, columns).

Pick the material first, then apply the calculator with the right post and panel pricing. Wood pickets and panels: lowest upfront cost ($15-25/ft installed in US, £20-30/m in UK), classic look, requires staining/painting every 3-5 years, lifespan 15-25 years. Cedar and redwood last 20-30 years but cost 2-3× treated pine. Vinyl (PVC) panels: higher upfront ($25-40/ft, £30-50/m) but zero maintenance, no painting needed, 20-30 year lifespan, color fading minimal with UV stabilizers, can crack in extreme cold. Chain link: cheapest ($10-15/ft, £15-25/m), security and boundary only (no privacy without slats), galvanized steel lasts 20+ years, black-coated vinyl chain link more aesthetic. Aluminum: $30-50/ft installed, decorative ornamental look, very durable, doesn't rust, lifetime warranty common. Composite (wood-plastic): $40-60/ft, no maintenance, 25-30 year warranty, premium choice. Pick wood for budget + classic, vinyl for low maintenance, chain link for boundary only, aluminum for ornamental, composite for premium long-term.

Gates need careful planning beyond just the fence run. Walk gates: 3-4 feet wide typical, $150-300 each including hardware (hinges, latch, drop bolt), require 2 extra posts (4×4 hinge post and 4×4 latch post), set deeper than regular fence posts. Driveway gates: 8-16 feet wide, $300-1,500 for the gate alone, plus $200-500 for hardware, plus optional automatic opener ($500-2,000). Driveway gates need 6×6 in posts set in 18 in diameter holes with 4 bags of concrete each for the heavier load. Gate width should match the opening: a 4 ft gate in a 4 ft opening leaves no swing clearance; plan a 3.5 ft gate in a 4 ft opening for comfortable swing. Self-closing hinges and child-safety latches are required for pool fence gates per most building codes. The calculator's gate input automatically adds 2 posts per gate and reduces panel count by the gate opening width.

Total fence project cost = materials + concrete + gates + installation labor. Material breakdowns vary by region. United States 2026 averages: $10-30/linear foot installed (chain link cheapest, wood mid-range, vinyl and aluminum premium). United Kingdom: £20-50 per metre installed (close-board wood ~£25/m, decorative ~£40/m, composite ~£60/m). Canada: $15-40 CAD per linear foot. Australia: A$70-180 per metre (Colorbond steel ~A$70-100/m, timber ~A$80-150/m, hardwood/composite ~A$120-180/m). Add-ons that increase cost: gates ($150-500 each), removal of old fence ($3-8/linear ft), permit fees ($50-200), HOA application fees, dirt/stump removal for new construction, slope-grading on steeply sloped yards. The calculator's optional install-per-foot field automates labor cost calculation when you enter your local quoted rate.

Six mistakes that cause material shortages or property disputes. (1) Wrong post spacing for material — using 8 ft default with 6 ft tall heavy vinyl panels in a windy site leads to wobbly fence within one season. Match spacing to load. (2) Forgetting gate posts — gates need 2 extra posts beyond regular fence run. Skipping this leaves gates flexing and failing. (3) Setting posts above frost line — heaving destroys post alignment in 1-2 winters in cold climates. Verify local frost depth. (4) Not verifying property boundaries — setting fence on neighbor's land creates costly removal disputes. Get a survey or plat map. (5) Skipping the permit — illegal fences must be removed at owner expense, with fines. Always check city/HOA rules first. (6) Calling utilities AFTER digging — striking a gas or electric line is a 911 emergency and can cause serious injury. US 811, UK National Grid, CA ClickBeforeYouDig, AU Dial Before You Dig — call before any post hole digging. The single biggest accuracy improvement: measure twice, plan once, verify boundaries and code before ordering materials.

DIY fence installation is realistic for short straight runs (under 100 linear feet) on level ground with no significant grade changes. You'll need a post hole digger or rented auger ($60-100/day in US), 4 ft level, hammer drill (for vinyl), and a helper for setting posts plumb. Wood fence DIY is the most accessible — pressure-treated lumber, simple hand tools, $300-600 in tool rentals plus materials. Vinyl DIY is harder — vinyl panels need precise post alignment because they don't field-cut well. Chain link DIY is moderate — tensioning the mesh requires technique. Hire a contractor when: the run is over 200 ft, the yard has significant slope (terraced posts needed), the soil is rocky (mechanical auger required), local code requires permit and inspection, the project includes a driveway gate (motor + hardware is specialist work), or the property has multiple corner direction changes (complex layout). Professional install runs $10-30/linear ft in US and includes permits, materials sourcing and waste disposal.

Quick mental math for fence projects. 50 ft fence with 1 gate: 8 posts, 6 panels, 16 concrete bags. 100 ft fence with 1 gate: 16 posts, 12 panels, 32 concrete bags. 200 ft fence with 1 gate, 1 corner: 28 posts, 24 panels, 56 concrete bags. Backyard typical (60 × 80 ft three sides = 200 linear ft): 26-30 posts depending on gates and corners, 22-25 panels, 52-60 concrete bags. Front yard typical (60 ft with 1 gate): 9 posts, 7 panels, 18 concrete bags. Pool fence (60 × 30 ft = 180 ft, 6 ft spacing for code): 32 posts, 22 panels, 64 concrete bags. Always: round up, verify property boundaries, check local permit requirements, locate utilities before digging, and add 5-10% buffer for damaged boards and future repairs. Use the calculator above for project-specific numbers; this cheat sheet is for ballpark estimates when scoping work.