Fence Panel Calculator

Estimate how many fence panels and posts you need for a straight fence run.

Fence length (m)

Panel width (m)

Extra panels allowanceAdd a spare if you want one for future replacement.

Enter the fence length and press Calculate.

How the fence calculation works

The calculator divides the total run by the nominal panel width and rounds up. A simple straight run normally needs one more post than the number of panel bays.

Planning the final bay

If the fence length is not an exact multiple of the panel width, the final bay may need a cut panel or a narrower custom section.

This is a quantity estimate. Post size, hole depth, foundations, wind loading, boundary position and local planning rules are project-specific.

Frequently asked questions

Are 6 ft fence panels exactly 6 ft wide?

Many are sold at approximately 1.83 m wide, but check the actual manufacturer's dimensions before setting posts.

Does the result include gate posts?

No. Gates often require different posts and spacing, so calculate the gate opening separately.

Concrete for fence posts

For round post holes, use the Concrete Calculator UK to estimate concrete volume across multiple holes.

Turning a fence length into panels and posts

Fence panels are sold in fixed widths, so the result rounds up to a complete panel rather than assuming the final panel can always be used at full size. Measure the actual line of the fence between the intended end points, not just a boundary shown on a plan. Sloping ground, returns and corners should be treated as separate runs where possible.

Remember the space taken by posts

A panel width is not always the same as the centre-to-centre distance between posts. Concrete or timber posts, gravel boards, clips and brackets can change the installed spacing. Use the calculator as a purchasing estimate, then set out the first few post positions using the dimensions of the system you have chosen before digging holes.

Gates, corners and awkward end bays

A straight run normally needs one more post than the number of panel bays, but gates, corners, changes of direction and stepped fencing can require additional posts. If the final bay is narrower than a standard panel, allow for a cut panel or a purpose-made section. The optional extra-panel field can also be used to keep a spare matching panel for later storm or impact damage.