Fence Panel Calculator
Work out exactly how many fence panels, posts, gravel boards and bags of concrete you need for your garden fence — gates included.
Calculate Your Fence Materials
Enter the total run of fencing, your panel size, and any gates to see how many panels, posts, gravel boards and bags of concrete your project needs.
Fencing Calculator
Enter the fence run and panel details to see the materials list
The full run of fencing you need to cover
Standard fence panels are usually 1830mm (6ft) wide
Used to fine-tune the materials guidance below
Gate widths are deducted from the run and each gate adds two posts
Materials Needed
Based on standard UK fencing installation guidance
Standard Fence Run Reference Chart
Approximate panels and posts needed for common fence run lengths, based on standard 1.83m (6ft) wide panels.
| Fence Run | Panels Needed | Posts Needed | Concrete Bags (approx.) |
|---|---|---|---|
| 6 m | 4 | 5 | 10 |
| 9 m | 5 | 6 | 12 |
| 12 m | 7 | 8 | 16 |
| 15 m | 9 | 10 | 20 |
| 20 m | 11 | 12 | 24 |
| 25 m | 14 | 15 | 30 |
| 30 m | 17 | 18 | 36 |
Fence Panel Calculator FAQ
Everything you need to know about working out panels, posts and materials for your fence.
Divide the total length of fencing you need by the width of one panel, then round up to the nearest whole number. For example, a 20 metre run using standard 1.83 metre wide panels needs 11 panels to cover the distance, with the final panel or post spacing adjusted to fit.
You generally need one more post than the number of panels, since each panel sits between two posts and neighbouring panels share a post. A run of 11 panels typically needs 12 posts, with extra posts added for any gates.
As a general guide, one 20kg bag of postcrete or similar fast-setting concrete is enough for a smaller post hole, while larger or taller posts often need two bags each to set them firmly. Always check the product guidance for your specific post size and soil type.
Gravel boards are recommended along the base of a fence to keep the panels off the ground, which helps prevent rot and extends the life of the fence. You typically need one gravel board per panel bay, matched to the same width as the fence panels.