How this calculator works
This runs our fence panel calculator. Subtract the width of the gates from the total length and divide by the width of a panel (1.83 m), rounding up. A fence needs one more post than it has panels, and each gate adds one more. Posts are buried about a third of the fence height, and at least 600 mm.
Worked example: 10 m of 1.8 m fence with one 0.9 m gate: 5 panels, 7 posts of — m, 5 gravel boards and 7 post caps. Without the gate, 10 m needs 6 panels.
Materials by fence length (1.8 m panels of 1.83 m, one 0.9 m gate)
The last panel is often cut down to fit.
| Fence length | Panels | Posts | Gravel boards |
|---|---|---|---|
| 6 m | 3 | 5 | 3 |
| 10 m | 5 | 7 | 5 |
| 15 m | 8 | 10 | 8 |
| 20 m | 11 | 13 | 11 |
| 30 m | 16 | 18 | 16 |
Tips before you buy
- Fit gravel boards under the panels so that the timber does not touch the soil. It makes the panels last much longer.
- Set the posts at the panel spacing, check them for plumb in both directions, and let the concrete set before hanging the panels.
- Start at the end that is most visible, or the end with the gate, so that any cut panel ends up in a less visible place.
- Use pressure-treated posts rated for ground contact.
- Check for buried services before you dig, using the free LSBUD service.
Tools & materials for this project
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Frequently asked questions
How many fence panels do I need for 10 metres?
5 panels of 1.83 m for 9.1 m of fence, if one 0.9 m gate takes up the rest. With no gate, 10 m needs 6 panels, with the last one cut down.
How many fence posts do I need?
One more than the number of panels, plus one for each gate. 5 panels and a gate need 7 posts.
How long should fence posts be?
The fence height plus a third of the height (and at least 600 mm) in the ground. A 1.8 m fence takes — m posts.
What is the standard size of a fence panel?
1.83 m (6 ft) wide, and 0.9, 1.2, 1.5 or 1.8 m high. Other widths are sold, so check before you order the posts.
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Related calculators & guides
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.