Fence Calculator
Estimated Materials
Total Estimated Cost
$750.00
Post count includes +1 for ending post
Planning a new fence for your backyard, garden, or property line? Our Fence Calculator helps you determine exactly how many panels, posts, rails, and pickets you need to buy. Save money by ordering the right amount of material the first time.
Quick tip: Always check your local building codes and property lines before starting. A standard 6-foot tall wood fence usually requires 3 rails and posts every 8 feet.
- Calculates posts, panels, and pickets
- Estimates total material cost
- Adjustable picket and gap spacing
How to Calculate Fence Materials
Calculating materials for a fence requires three main measurements: the total length of the fence, the desired height (which determines rail count), and the spacing between posts. Most homeowners use prefabricated panels, which come in standard 6 or 8-foot widths. If you are building a custom fence from scratch, you will also need to calculate pickets.
Our tool simplifies this process by using the total length to determine the number of sections. It automatically adds an extra post for the end of the run and calculates pickets based on the width and gap spacing you provide. This ensures your estimate includes all the major vertical and horizontal components.
Fence Post Spacing Rules
Post spacing is critical for the structural integrity of your fence. If posts are too far apart, the fence may sag or blow over in high winds.
- 8-Foot Spacing: The industry standard for most residential fences, especially vinyl and wood panels.
- 6-Foot Spacing: Recommended for heavy privacy fences, windy areas, or when using thinner rails that might sag.
- Corner & End Posts: Remember that every corner or end requires a post, regardless of spacing. Our calculator assumes a straight line and adds one end post to the total.
Calculating Pickets and Gaps
The number of pickets depends on the "effective width" of each picket. This is the width of the board plus the width of the gap between boards.
For a "solid" privacy fence, the gap is zero. For a "picket" fence or shadowbox style, you might have a 1-inch or 2-inch gap. The formula is:
Total Pickets = (Fence Length in Inches) / (Picket Width + Gap Width)
Always buy 5-10% extra pickets to account for boards that are split, warped, or damaged upon arrival.
3 Common Fencing Scenarios
1. Standard Privacy
6ft tall wood fence with 8ft spacing and no gap between pickets.
Best for: Backyards
2. Decorative Picket
4ft tall fence with 2-inch gaps between narrow pickets.
Best for: Front yards
3. Heavy Duty Vinyl
Prefabricated 8ft panels with internal aluminum reinforcement.
Best for: Low maintenance
Frequently Asked Questions
Should I use pressure-treated wood for my fence?
Yes, especially for the posts. Posts are in direct contact with the ground and moisture. Pressure-treated wood or cedar is essential to prevent rot and insect damage.
Do I need concrete for every post?
While some use gravel for drainage, concrete is highly recommended for gate posts and corner posts to prevent leaning over time. For line posts, it depends on your soil type.
How do I handle a slope?
You can either "step" the fence (keep panels level but drop them down) or "rack" the fence (slope the rails to follow the ground). Stepping is easier with prefab panels.