Understanding Fence Calculations
Building a fence requires careful planning to ensure you have all the necessary materials. The main components include posts, rails, pickets (or panels), concrete for setting posts, and hardware. This calculator helps you estimate quantities and costs for your specific fence project.
Fence Type Comparison
| Type | Cost/Linear Ft | Lifespan | Maintenance |
|---|---|---|---|
| Wood Privacy | $15-35 | 15-20 years | High (stain/seal) |
| Wood Picket | $10-25 | 15-20 years | High (paint/stain) |
| Vinyl Privacy | $20-40 | 25-30 years | Low (wash) |
| Chain Link | $8-18 | 20+ years | Very Low |
| Split Rail | $12-20 | 15-25 years | Low |
Standard Fence Components
Posts
Posts are set 6-10 feet apart depending on fence type and desired strength. For privacy fences, 8 feet is standard. Posts should be set in concrete at least 1/3 of the total post length (e.g., 2 feet deep for a 6-foot fence with 8-foot posts).
Rails
Horizontal rails connect posts and support pickets. Standard fences use 2-3 rails. A 6-foot fence typically uses 3 rails (top, middle, bottom). Rails are usually 2x4 or 2x3 lumber.
Pickets
Pickets are the vertical boards that create the fence surface. Standard pickets are 3.5 inches or 5.5 inches wide. Space pickets 0-3 inches apart for privacy, or 2-4 inches for decorative fences.
Post Depth Guidelines
| Fence Height | Post Length | Depth in Ground |
|---|---|---|
| 4 ft | 6 ft | 24" |
| 5 ft | 7 ft | 24" |
| 6 ft | 8 ft | 24-30" |
| 8 ft | 10-12 ft | 30-36" |
Fence Building Tips
- Call 811 before digging to locate underground utilities
- Check local codes and HOA rules before building
- Keep fence 2-4 inches off the property line (verify local laws)
- Set corner and end posts first, then string a line for middle posts
- Use pressure-treated lumber for posts that contact the ground
- Add 10% extra materials for waste and mistakes
- Allow concrete to cure 24-48 hours before attaching rails