Work out fence panel quantity instantly with clear inputs, formula shown and shareable results.
Panel count is fence length divided by panel width, with a part panel added if the run does not divide evenly. Because a cut panel wastes the remainder and awkward runs sometimes need two cuts, a small allowance is added on top of the whole panels.
Panel count
Panels = ceil((whole panels + part panel) x (1 + allowance))
Panels = ceil((whole panels + part panel) x (1 + allowance)). Panel count is fence length divided by panel width, with a part panel added if the run does not divide evenly.
At the least visible end, or split between both ends so the fence looks symmetrical. Setting post positions from a corner rather than the middle keeps the cut in one place.
This calculator takes 4 inputs: Fence length, Panel width, Panel height, Cut panel allowance. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.