Posts
Post length is selected around the finished fence height and installation method. For in-ground fitting, the calculator allows at least 450mm below ground where a suitable stock length exists.
Free Wern-Wood project calculator
Build Your Featheredge Fence
Enter your measurements and we’ll work out the materials you need, ready to add to your basket.
- Boards, posts, rails and fixings calculated
- Quantities include a 10% contingency
- Add everything to your basket in one go
Fence measurements
Posts and rails
Gravel boards and postmix
Calculations use a fixed 25mm featheredge overlap
and include a fixed 10% board contingency.
Rails
Available motorway rail lengths are compared against the selected post spacing, favouring fewer pieces where the resulting waste is reasonable.
Stock alternatives
Temporarily unavailable variants remain part of the calculator. Where possible, an available alternative is selected and shown clearly before anything is added to basket.
Use our free featheredge fence calculator to estimate the boards, posts, rails, gravel boards, postmix and fixings needed for a straight fence run. Enter your measurements and choices to build a materials estimate using current Wern-Wood products.
How many feather edge boards do I need?
Enter the total fence run, then choose the board width and length. The calculator uses a fixed 25mm featheredge overlap, works out the board quantity across the full run and adds a 10% contingency for waste and cutting.
How many feather edge boards per metre?
With the calculator's fixed 25mm overlap, a 125mm featheredge board gives 100mm of effective coverage, so you need roughly 10 boards per metre before contingency. A 150mm board gives 125mm of effective coverage, so you need roughly 8 boards per metre before contingency. The calculator then rounds to whole boards and adds the 10% contingency across the complete fence run.
What does the calculator include?
- 125mm or 150mm pressure treated featheredge boards
- Fence posts for in-ground or bolt-down installation
- Motorway rails
- Optional gravel boards
- Postmix and suitable fixings where selected
- Current product prices and availability before adding to basket
How much should feather edge boards overlap?
This calculator uses a fixed 25mm overlap so every estimate is calculated consistently. If your fence is being built with a different overlap, the number of boards required will change.
The calculator is designed as a materials estimate for a straight fence run. Gates, corners and substantial changes in ground level may need separate adjustment.
Need the installation method as well as the quantities? See our step-by-step feather edge fence guide for post centres, rail spacing, gravel board, 25mm overlap and fixing position.
Need to compare the available components first? View the complete Featheredge Boards range or shop the individual pressure treated featheredge boards.
