Gravel Board Calculator — Boards, Clips & Materials
Calculate how many gravel boards and clips you need for your fence. Choose between concrete and timber boards to match your fence panels.
Choose how to specify your fence size
Total length of fencing
Concrete posts require gravel board clips
Adds 10% extra for breakages
10% recommended — concrete boards can crack in transit
How We Calculate This
Our gravel board calculator works out the number of boards needed based on either your total fence run length or the number of fence bays. Each bay requires one gravel board.
The formula
Gravel boards = Fence length ÷ Board length (rounded up)
Or simply: Gravel boards = Number of fence bays
Clips = Boards × 2 (for concrete posts only)
For example, a 10m fence with 1.83m boards: 10 ÷ 1.83 = 5.46, rounded up to 6 gravel boards. With concrete posts, you would need 12 gravel board clips (2 per board).
Material comparison
- Concrete gravel boards: 1.83m × 150mm × 50mm, weight approximately 20-25kg each. Rot-proof and maintenance-free. Slot into concrete post grooves
- Timber gravel boards: 1.83m × 150mm × 22mm, pressure-treated softwood. Lighter and easier to handle but will eventually need replacing
Installation tips
- With concrete posts, slide the gravel board into the bottom slot before fitting panels
- Ensure a small gap between the board and the ground for drainage
- On sloping ground, cut timber boards to follow the gradient or stack boards
- Always install gravel boards before fence panels for easiest fitting
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Verify with your supplier.