About this tool
What Is a Fence Calculator?
A fence calculator estimates the materials, quantities, and costs needed for a fencing project based on fence type, length, height, and post spacing. It calculates the number of posts, sections/panels, concrete bags, and hardware items, then multiplies by your local material prices.
The basic formula is:Posts = (Total Length ÷ Post Spacing) + 1Sections = Posts - 1Concrete Bags = Posts × 1.5
Fence Type Comparison
| Type | Cost/ft | Lifespan | Maintenance | Privacy |
|---|---|---|---|---|
| Wood (Cedar) | $15-35 | 15-20 years | Stain every 2-3 years | High |
| Wood (Pressure Treated) | $10-25 | 10-15 years | Stain every 2-3 years | High |
| Vinyl | $25-45 | 25-30 years | Wash annually | High |
| Chain Link | $8-18 | 15-25 years | Minimal | Low |
| Aluminum | $25-55 | 30+ years | Minimal | Low-Medium |
Post Spacing Guidelines
- Wood fences: 8 feet is standard. 6 feet for high-wind areas or tall fences (8 ft+).
- Vinyl panels: 6-8 feet, determined by panel width (most panels are 6 or 8 ft wide).
- Chain link: 10 feet is standard for line posts. Terminal posts at every end, corner, and gate.
- Always call 811 before digging to check for underground utilities.
Practical Usage Examples
Backyard Privacy Fence
150 ft × 6 ft wood, 8 ft spacing, 4 corners, 1 gate
Posts: 20, Sections: 19, Concrete: ~30 bags, Est. Cost: ~$1,500Step-by-Step Instructions
Step 1: Select Fence Type. Choose Wood (pickets + rails), Vinyl (panels), or Chain Link based on your project.
Step 2: Enter Total Length. Measure the total perimeter of your fence line in feet. Include all straight runs.
Step 3: Set Fence Height. Enter the desired height in feet (4 ft for decorative, 6 ft for privacy, 8 ft for security).
Step 4: Set Post Spacing. Standard is 8 feet for wood, 6-8 feet for vinyl. Closer spacing = stronger fence but more posts.
Step 5: Enter Gates and Corners. Add the number of gates and corner posts. Gates require extra posts and hardware.
Step 6: Review Materials. Get complete material list, cost breakdown, layout guide, and installation tips.
Core Benefits
Complete Material Lists: Calculates posts, panels/pickets, rails, concrete bags, gate hardware, and post caps for your exact fence dimensions.
Multi-Type Support: Provides accurate estimates for wood (post-and-rail with pickets), vinyl (pre-made panels), and chain link fencing.
Concrete Estimation: Calculates the number of concrete bags needed based on 1.5 bags per post hole (standard for 10-12" diameter, 24-36" deep holes).
Cost Transparency: Shows total material cost broken down by component (posts, panels, concrete) so you can budget accurately.
Frequently Asked Questions
Divide your total fence length by the post spacing, then add 1. For example, 100 feet ÷ 8 feet spacing = 12.5, rounded up to 13, plus 1 end post = 14 posts total. Add extra posts for gates (2 per gate) and corners.
The rule of thumb is 1/3 of the total post length should be underground. For a 6-foot fence with 8-foot posts, dig 24-30 inches deep. Frost line in cold climates may require deeper holes (36-42 inches).
Standard recommendation is about 1.5 bags of 50-lb quick-set concrete per post hole (10-12 inch diameter, 24-30 inches deep). For 4x4 posts, 1 bag may suffice; for 6x6 posts in deep holes, plan for 2 bags.
Standard spacing is 8 feet for most residential wood fences. Use 6-foot spacing for tall fences (8 ft+), high-wind areas, or when using lightweight materials. Too wide causes sagging between posts.
Wood: $10-35/linear foot installed. Vinyl: $25-45/foot. Chain link: $8-18/foot. These include materials and professional installation. DIY saves 40-60% by eliminating labor costs.
Use 4x4 posts for fences under 6 feet tall. Use 6x6 posts for fences 6 feet and taller, gate posts, and corner posts. Gate posts should always be at least 6x6 to handle the weight and swing stress.
Most municipalities require permits for fences over 6 feet tall. Some require permits for any fence. Check your local building codes and HOA rules before starting. Property surveys may be needed to confirm lot lines.
Pressure-treated pine: 10-15 years. Cedar: 15-20 years. Redwood: 20-25 years. Lifespan depends on climate, soil contact, and maintenance. Staining or sealing every 2-3 years can add 5-10 years to lifespan.
Chain link is the cheapest at $8-18 per linear foot installed. For privacy, pressure-treated wood is the most affordable at $10-25 per foot. Vinyl costs more upfront but requires less maintenance over time.
No. All calculations run in your browser. Your fence dimensions, material choices, and cost data are never transmitted to any server.