Fence Panel Calculator
Fencing a garden boundary means getting your panel count, post count and postcrete right before you start digging — too few materials means a wasted trip back to the shop, too many means money sat unused in the shed. Enter the total length of your fence run and your panel size below and we'll work out exactly how many panels, posts and bags of postcrete you need, plus a few well-reviewed garden essentials to go alongside the job.
Enter your fence run
Tell us the total length of fencing you need and the panel size you plan to use.
Enter a fence length above to see how many panels, posts and bags of postcrete you'll need.
Recommended for your garden
A few well-reviewed options to go alongside your fencing project.
£429.00
Pros
- Weatherproof, UV-protected resin construction
- No rot, rust or peeling paint
- Lockable double doors with skylight for natural light
Cons
- Needs a solid, level base for assembly
£349.00
Pros
- Traditional overlap timber cladding
- Budget-friendly for the size
- Includes windows for natural light
Cons
- Requires annual timber treatment
Frequently asked questions
Do I need my neighbour's permission to replace a shared fence?
You don't normally need permission to replace a fence on your own side of a boundary, but if the fence or its posts sit directly on the boundary line or are jointly owned, it's good practice — and can avoid disputes — to discuss the work with your neighbour first, especially if you need temporary access to their side to fit posts or panels.
How deep should fence posts be?
As a general rule, bury around a third of the total post length in the ground, with a minimum hole depth of about 600mm (60cm) for a standard 1.8m panel fence. Deeper holes, around 750mm, are safer on exposed or windy sites to stop posts leaning over time.
Concrete or postcrete for fence posts?
Postcrete (fast-setting fence post concrete) is the easier option for most DIY jobs — you pour it dry around the post with some water and it sets rigid in minutes, holding the post in position while you work. Traditional mixed concrete is cheaper for large jobs but needs mixing, more care to keep posts aligned, and longer to cure.
How many bags of postcrete does one fence post need?
For a standard post hole of around 300mm x 300mm x 600mm, two 20kg bags of postcrete is a reasonable estimate for most residential fence posts, though larger or deeper holes for taller fences may need three.