Measure the area that will actually receive coating. For a solid flat fence, route length excluding gates × height × painted faces gives a starting area. Rails, post faces, board edges and gate infill add surface. Open picket fences can have less face area but more exposed edges.
Divide coating area × coats by the selected coverage per litre per coat. Then add a chosen allowance for texture and losses. A 10 m × 1.8 m fence coated on both faces has 36 m² before edges and posts. At an illustrative 8 m²/L for one coat, that is 4.5 L before allowance.
Measure the area that will actually receive coating. For a solid flat fence, route length excluding gates × height × painted faces gives a starting area. Rails, post faces, board edges and gate infill add surface. Open picket fences can have less face area but more exposed edges.
↗A loose board can be a local repair. Several leaning posts, recurring gate sag or widespread deterioration may point to a supporting-system problem. Look at posts, rails, fixings and gate alignment rather than judging the fence only by its visible finish.
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Fence