Fence calculator
The calculator needs JavaScript. The worked example, formula and figures below show exactly how it works, so you can do the sum yourself. A guide, not advice. Check your supplier's or maker's figures before ordering.
Short answer
Work out how many panels, posts and gravel boards a fence needs. Enter your measurements below; every figure we start from is shown and you can change it.
Worked example
| You enter | Value |
|---|---|
| Straight runs | 10 m |
| Corners where two runs share a post | 0 |
| Panel width | 1.83 m |
| Post width | 100 mm |
| Gravel boards under the panels | Yes |
Order: 6 panels and 7 posts
| Result | Value |
|---|---|
| Panels | 6 |
| Posts | 7 |
| Gravel boards | 6 |
| Trim the last panel by | 1.68 m |
Show the working
- Run 1 (10 m): (10 − 0.1) ÷ (1.83 + 0.1) = 5.13, rounded up to 6 panels and 7 posts; trim the last panel by 1.68 m
How it works
- Panels per run = (run − post width) ÷ (panel width + post width), rounded up
- Posts = panels + 1 per run, less 1 for each corner where runs share a post
- Gravel boards = panels; trim = panels × panel width + posts × post width − run
Post concrete comes from the maker's instructions, so enter it from the bag.
Our default (adjustable)
These are typical planning figures and our own allowances, not facts about your product. Change any of them in the calculator to match your bag, pack or tin.
| Figure | Our default (adjustable) | Kind | Source |
|---|---|---|---|
| Panel width | 1.83 m | Common UK size Not yet checked against the source | From your product 6 ft panel. |
| Post width | 0.1 m | Common UK size Not yet checked against the source | From your product 100 mm post. |
| Post-fix bags per post | Enter from the bag, pack or tin | Typical value Not yet checked against the source | From your product Enter from the post-fix maker's instructions. |
FAQs
Guides
How many fence panels and posts do I need?
The sum for fence panels and posts on a straight run, sharing posts at corners, gravel boards and concrete per post.