Home » Garden & Outdoor » How Many Fence Panels and Posts Do I Need?
How Many Fence Panels and Posts Do I Need?
The formula
Fence length ÷ panel width = panels; posts = panels + 1, plus gates and corners. A 100 ft run with 8 ft panels needs 13 panels and 14 posts. Add 1 spare panel for future repairs. Verify with our Fence Calculator.
Worked example: 60×40 ft backyard
Perimeter = 200 ft minus a 4 ft gate = 196 ft. At 8 ft panels: 25 panels + 26 posts + gate hardware. Wood posts go 2 ft deep in concrete (one 60-lb bag per post ≈ 26 bags); metal posts need less concrete but special brackets.
Material choice
- Pressure-treated pine: cheapest, 10–15 years with stain
- Cedar: resists rot naturally, 15–20 years, costs 30% more
- Vinyl/PVC: zero painting, 20+ years, highest upfront — see our PVC fencing guide
- Chain-link: cheapest for large runs, add slats for privacy
Steps in order
Call 811 for utilities, confirm the exact property line (a survey beats a neighbor dispute), set corner and gate posts first with string lines, then fill runs. Keep wood 2 inch off soil and slope concrete footings away from posts so water drains.
FAQ
- How deep for frost? Below local frost line — 36 inch in cold zones, 24 minimum elsewhere.
- DIY or pro? Straight runs are DIY-friendly; slopes, rock, and 200+ ft runs favor pros.
- Permit? Most cities cap front yards at 3–4 ft and sides at 6 ft — check first.
Cost reality
DIY wood runs $15–$30 per foot in materials; pro-installed cedar $30–$60; vinyl $40–$80. Our 196 ft example: roughly $4,000 materials DIY versus $8,000–$12,000 installed. Gates add $200–$600 each in hardware and framing time.
Limits
Rocky or sloped ground can double labor; panel math assumes level runs — stepped fencing on slopes needs extra posts. Always confirm HOA rules before buying. More in our garden guides.
Maintenance calendar
Year 1: check posts after first winter for frost heave and re-tamp. Yearly: wash vinyl, restain wood every 2–3 years, tighten gate hinges before they sag. Keep sprinklers off fence boards — constant wetting rots wood and stains vinyl green within two seasons. Trim plants 6 inch back for airflow.
One last rule: photograph the finished fence with a tape measure visible at two post spacings and file the material receipts. Warranty claims on warping or coating failure go twice as fast with dated proof, and the photos settle boundary questions before they become disputes.