Fence Calculator

Divide your total fence length by the post spacing (typically 6-8 feet for wood, 10 feet for chain link), then add 1. Add extra posts for corners, gates, and end points. Example: A 100-foot fence with 8-foot spacing needs 100÷8+1=14 line posts, plus corner and gate posts. Wood fences typically use 6-8 foot spacing, while metal and vinyl can span 8-10 feet. Heavier materials or high-wind areas require closer spacing for stability.

The standard rule is to bury 1/3 of the total post length underground. For a 6-foot fence, use 8-foot posts and bury 2 feet deep. In cold climates with frost heave, dig below the frost line—typically 3 feet. Post holes should be 3 times the post width (12 inches for 4x4 posts). Use concrete for structural posts, gates, and corners. End posts and corners bear more stress and may need deeper setting or additional bracing.

Wood privacy fences offer the most privacy and natural look at moderate cost ($15-30/linear foot installed), but require maintenance every 2-3 years. Vinyl is maintenance-free and lasts 20+ years but costs more upfront ($25-40/foot). Chain link is most economical ($10-20/foot) and durable but offers no privacy—good for containing pets. Aluminum ($30-50/foot) and wrought iron ($50-100/foot) are decorative and long-lasting but expensive. Consider: purpose (privacy, security, pets), maintenance willingness, budget, and HOA requirements.

Most posts require 1-2 bags (50 lb/23 kg each) of concrete mix. A standard post hole (10-12 inches diameter, 24 inches deep) needs about 1 bag. Deeper holes (36 inches for frost line) or larger diameter holes need 2 bags. Gate posts and corner posts that bear extra stress should use 2 bags minimum. For a quick estimate: multiply your total posts by 1.5 bags. Fast-setting concrete is easier for DIY—just pour dry mix and add water. Traditional concrete is stronger for heavy-duty applications.

Most areas require permits for fences over 6 feet tall. Check local regulations for: setback requirements (typically 2-6 inches from property line), maximum height limits (usually 6 feet backyard, 4 feet front yard), material restrictions in HOA communities, and utility easement locations. Always call 811 before digging to locate underground utilities—this is free and often legally required. Some areas require the 'good side' of a fence (smooth side) to face outward toward neighbors. Property surveys prevent disputes about exact boundary locations.