Fence Calculator Form
Use one consistent unit throughout the project. Costs are optional but useful for budgeting.
Example Data Table
These examples show how different garden fence layouts can be budgeted before buying panels, posts, rails, and concrete.
| Scenario | Mode | Gross Length | Gate Openings | Net Length | Panels | Estimated Posts |
|---|---|---|---|---|---|---|
| Backyard rectangle | Rectangle | 200 ft | 4 ft | 196 ft | 25 | 27 |
| Side garden run | Direct length | 85 ft | 0 ft | 85 ft | 11 | 11 |
| Irregular orchard edge | Custom runs | 118 ft | 6 ft | 112 ft | 14 | 16 |
Formula Used
Gross boundary length depends on the chosen mode. Rectangle mode uses 2 × (length + width). Custom runs sum every entered segment. Direct length uses the single total run.
Net fence length = gross boundary length − total gate openings.
Base panels = ceiling(net fence length ÷ panel width).
Estimated line posts = ceiling(net fence length ÷ post spacing) − corner posts − end posts.
Total posts = line posts + corner posts + end posts + gate posts.
Rails = panels × rails per panel.
Pickets per panel = ceiling(panel width ÷ (picket width + picket gap)).
Concrete volume = posts × π × (hole diameter ÷ 2)2 × hole depth.
Purchase quantities apply the waste factor: base quantity × (1 + waste% ÷ 100), rounded up where needed.
Total cost = materials subtotal + labor subtotal.
How to Use This Calculator
- Select the calculation mode that matches your garden layout.
- Enter the total boundary dimensions, segment lengths, or direct fence run.
- Add gate widths so the tool can remove openings from the fenceable distance.
- Set panel width, post spacing, rails, picket details, and waste percentage.
- Add concrete and cost values if you also want a budget estimate.
- Click Calculate Fence Plan to see results above the form.
- Use the CSV or PDF buttons to download the results table.
- Review the Plotly chart for a quick cost breakdown before purchasing materials.
FAQs
1) What does fence length mean here?
Fence length means the total boundary distance that actually needs fencing after subtracting gate openings. It helps estimate panels, rails, posts, concrete, and budget more realistically for a garden project.
2) Should I subtract gate openings from the perimeter?
Yes. Gates occupy part of the boundary but do not need standard fence panels. Subtracting those openings gives a more practical net fence length for ordering fence materials and labor.
3) Why is a waste allowance included?
Waste covers cutting losses, awkward corners, damaged boards, minor layout changes, and spare material for repairs. Even a small allowance can prevent an extra trip when installation begins.
4) Can I use feet or metres?
Yes. Choose the label you want, then keep every measurement in that same unit. Consistent entries matter more than the actual unit name shown in results.
5) Why does the panel count round upward?
Panels are bought as whole units. If the final span is partial, you still need another panel or must trim one. Rounding up protects the plan from shortages.
6) What if my panel width and post spacing differ?
That is allowed. Panel width estimates panel count, while post spacing estimates support intervals. Comparing both helps you spot layout mismatches before ordering materials or setting posts.
7) Is the concrete estimate exact?
It is a planning estimate based on cylindrical post holes. Real usage can vary because of soil collapse, drainage gravel, bell-shaped holes, or displacement from the post itself.
8) Can this work for curved or irregular garden edges?
Yes. Use the custom run mode and enter measured segments from your layout. For curves, break the boundary into short straight sections for a closer approximation.