Fence Calculator

Fence posts should be buried 1/3 of their total length, minimum 2 feet (60cm) for 6-foot (1.8m) fences. In cold climates, posts must extend below frost line—typically 3-4 feet (90-120cm). Use 8-foot (2.4m) posts for 6-foot fences, allowing 2 feet in ground. Concrete footings should be 3× post width (12"/30cm for 4×4 posts) and extend 4-6" (10-15cm) above grade to shed water from wood.

For standard 4×4 posts in 10" (25cm) diameter holes 2 feet (60cm) deep, use 1-2 bags (80 lb/36 kg each) of fast-setting concrete per post. Larger 6×6 posts or deeper holes need 2-3 bags. Fast-setting concrete is ideal—sets in 20-40 minutes without mixing. For high-wind areas or gate posts, use more concrete and deeper holes. Calculate 2 bags per post to be safe.

Standard pre-made fence panels are 6 or 8 feet (1.8 or 2.4m) wide, so post spacing should match panel size exactly (center-to-center). 8-foot spacing is most common. For picket fences without panels, 6-8 foot spacing works well. Closer spacing (6 ft/1.8m) provides more wind resistance. Start layout from corners and gates, adjusting middle sections to avoid awkward partial panels.

Wood fence costs vary: USA $15-35 per linear foot installed; Canada C$20-45/ft; UK £60-120/m; Australia A$75-200/m; NZ NZ$100-250/m. Materials only: USA $8-20/ft; UK £30-70/m. Posts cost $10-30 each; panels $50-150 each. Vinyl fencing costs 20-50% more than wood. Chain link is cheapest at $5-15/ft. Metal/aluminum fencing is premium at $25-75/ft. Labor typically equals material cost.

Each corner needs one additional post. Gate openings require 2 heavy-duty posts (4×6 or 6×6 instead of 4×4) and subtract gate width from panel count. End posts should be heavier for anchoring. For rectangular yards: 4 corner posts + line posts (total length ÷ spacing) + 2 extra posts per gate. Round up all calculations. Add 10% extra materials for cuts, mistakes, and future repairs.

Pressure-treated pine is most common and economical—lasts 15-20 years with maintenance. Cedar is naturally rot-resistant, beautiful, but costs 2× more. Redwood is premium at 3-4× the cost. For posts (ground contact), always use ground-contact rated pressure-treated wood or naturally rot-resistant species. Above-ground components can use less expensive above-ground rated lumber. Apply sealant every 2-3 years for maximum lifespan.