Post and Rail Calculator

Transform your boundary, paddock, or driveway with a classic post and rail fence, use our Post & Rail Calculator to accurately estimate the posts, rails, and fixings you’ll need. Whether you’re fencing a small garden edge or several acres, the tool helps you plan with confidence, reduce waste, and order the right quantities first time.

What is Post & Rail Fencing?

Post and rail is a simple, strong, and attractive fencing style made from vertical fence posts and horizontal rails. It’s ideal for agricultural land, equestrian paddocks, rural driveways, and natural-looking garden boundaries. Common configurations include 2-rail, 3-rail, or 4-rail setups using sawn, half-round, or machine-round components. Wire stock fencing can be added for stock-proofing without spoiling the open look.

How does the Post & Rail Calculator help?

Our calculator removes the guesswork by giving you a clear, itemised list of materials based on your fence length. You’ll be able to order with confidence and keep your project on schedule.

You’ll get:

• Number of posts
• Number of rails
• Amount of nails needed

Expert tips for a professional finish

• Mark out corners first: set and plumb end/corner posts, then run a string line for straight, even bays.
• Choose UC4 posts: posts in ground contact should be UC4-treated; treat any cut ends with end-grain preservative.
• Mind your centres: wider post centres reduce posts but may increase rail deflection; 2.4 m–3.0 m is a reliable sweet spot.
• Gates: allow for gate openings and add strainer posts, hanging sets, and gate furniture where required.