Calcs.ToolsFence Calculator - How Many Fence Posts & Panels Do I Need!
Calculate exactly how many fence posts, panels, and materials you need for your fencing project. Our free fence calculator accounts for post spacing, fence height, and gate openings to ensure you purchase the right amount of materials and avoid costly mistakes.
How to Use the Fence Calculator
- Measure your perimeter: Walk around your property and measure the total linear feet you want to fence. Include all straight sections and corners.
- Choose post spacing: Select the appropriate post spacing based on your fence type and local soil conditions. Closer spacing provides more stability.
- Select fence height: Choose the desired fence height based on your privacy needs and local building codes.
- Account for gates: Subtract the width of any gates from your total perimeter since gates don't require fence panels.
Pro tip: Always check local building codes and HOA restrictions before starting your fence project. Some areas have height limits or require permits.
Understanding Your Fence Calculation
Our fence calculator uses precise mathematical formulas to determine exactly how many posts and panels you need. Understanding these calculations helps you make informed decisions about your fencing project.
Post Calculation
Posts are placed at regular intervals along the fence line. The calculator divides the total perimeter by the post spacing to determine how many posts are needed, then adds one for the starting post. Corner posts and gate posts are included in this calculation.
Panel Calculation
Fence panels span the distance between posts. The calculator subtracts the gate width from the total perimeter, then divides by the panel length (typically 8 feet) to determine how many panels are needed.
Example: A 120-foot perimeter with 8-foot post spacing and a 4-foot gate requires 16 posts and 14 panels (120 - 4 = 116 linear feet / 8 = 14.5, rounded up to 15 panels).
Gate Considerations
Gates require special posts and hardware. The calculator accounts for gate width by subtracting it from the total linear footage. Gates typically need reinforced posts and special hardware for smooth operation.
Additional Materials
Beyond posts and panels, you'll need concrete for post footings, fasteners, gate hardware, and finish materials. The calculator provides recommendations for these additional materials.
Fence Types & Post Spacing Guidelines
Wood Privacy Fence
- Post spacing: 6-8 feet
- Height: 6 feet standard
- Materials: Pressure-treated lumber
- Best for: Privacy and security
- Maintenance: Stain every 2-3 years
Vinyl/PVC Fence
- Post spacing: 6-8 feet
- Height: 4-6 feet common
- Materials: PVC panels and posts
- Best for: Low maintenance
- Maintenance: Virtually none
Chain Link Fence
- Post spacing: 8-10 feet
- Height: 4-8 feet available
- Materials: Galvanized steel
- Best for: Commercial/security
- Maintenance: Minimal
Decorative Aluminum
- Post spacing: 6-8 feet
- Height: 4-6 feet common
- Materials: Powder-coated aluminum
- Best for: Aesthetics
- Maintenance: Rinse occasionally
Fence Installation Tips & Best Practices
- Check local codes: Verify height restrictions, setback requirements, and permit needs
- Mark your layout: Use string lines and stakes to mark post locations before digging
- Dig proper holes: Post holes should be 1/3 the post length deep and 2-3 times wider than the post
- Set posts in concrete: Use concrete footings for stability, especially in loose soil
- Use proper hardware: Stainless steel or galvanized fasteners prevent rust
- Install gates last: Attach gates after the fence is complete for proper alignment
- Allow settling time: Wait 48 hours for concrete to cure before attaching panels
- Finish properly: Apply stain, sealant, or paint within 30 days of installation
Worked Examples and Layout Logic
Example: A 120 foot fence line with posts every 8 feet requires about 16 posts. Add one extra post for gates or corners, and include extra panels if you expect cuts.
The calculator uses: number of posts = total length / post spacing + 1. Panels are based on panel width and total length.
Edge cases include slopes or irregular property lines. For sloped fences, plan for stepped sections or custom cuts and add extra materials.
References and Sources
Fence material estimation follows standard spacing and layout practices.
- Typical fence post spacing guidelines (6-8 feet)
- Manufacturer panel width specifications
Related Construction Calculators
Fence layout details that affect material counts
Fence totals depend on post spacing, panel width, and the number of corners and gates. Use this calculator early, then refine counts once you choose a panel style.
Corner and end posts are often heavier than line posts, and gates need hardware that is easy to miss in a first pass. Plan extra posts if the terrain slopes or the layout changes direction.
Quick checks
- Measure the full run, including returns and offsets.
- Confirm panel width and post spacing before buying.
- Add hardware for gates, corners, and end posts.
Example: A 96 ft run with 8 ft panels needs 12 panels and 13 line posts, plus extra posts for two ends and one 4 ft gate.