Fencing Calculator

About Fencing Calculator

Fence Calculator estimates exactly how many panels, posts, gravel boards, post caps, arris rails, featheredge boards and bags of concrete you need for any UK fencing job — built for tradespeople and DIYers.

Enter your fence run length and pick a fence type. The app does the rest: panel count, post count, recommended post length, and concrete quantity. Switch to closeboard mode for featheredge board counts, arris rails, and per-bay breakdown. Add prices to see total cost in pounds.

KEY FEATURES

• Two fence types — panel fence and traditional closeboard with featheredge boards
• Standard UK panel sizes (6ft × 6ft, 6ft × 5ft, 6ft × 4ft, 6ft × 3ft)
• Closeboard featheredge widths — 100mm, 125mm (standard), 150mm — with 25mm overlap
• Three concrete methods — Postcrete (20kg bags), Quick-set (20kg bags), or manual ballast + cement mix
• Cement:ballast mix ratio matches BS 8500-1 / NHBC Chapter 11 (C20 fence-post mix, 1:4 by mass)
• Arris rail count follows BS 1722-5 — 2 rails below 1500mm, 3 rails at or above
• Post hole depth scales by fence height — 600mm for fences under 1500mm, 750mm for taller (per BS 1722-5 and Jacksons fitting guide)
• Recommended post length always meets or exceeds requirement — never under-spec'd
• Optional gravel boards (150mm) and post caps
• Custom closeboard height (300–2400mm)
• Optional cost estimation with per-item prices
• Share results to text, email or messaging apps

CALCULATION ACCURACY

Constants and rules cross-referenced with BS 1722-5 (close-boarded fencing specification), BS 8500-1 (concrete mix), NHBC Chapter 11 (post-fixing C20 mix), Hanson and Holcim Postcrete TDS, and supplier catalogues from Jacksons Fencing, Travis Perkins, Lawsons and Crestala. Standard bay width 1830mm matches the UK 6ft trade convention.

WHO IT'S FOR

• Fencers and landscape contractors quoting jobs
• Home renovators planning garden fences
• DIYers replacing damaged fence runs

NO FLUFF

No accounts, no tracking beyond the basics, no signup. Free to use.

DISCLAIMER

Calculations are estimates. Buy 10% extra for waste, cuts and breakages. Check your purchase with your supplier and obey local planning rules — fences over 2m generally require planning permission (1m next to a highway).