Fence infill calculator
Count full boards in one clear opening
Measure the available infill opening after framing. The gap is your design input, not a recommended movement allowance.
full boards fit
1.625 in remaining at each edge if centered.
Board faces, internal gaps and centered edge spaces are scaled along the clear width. The other dimension is schematic. No posts, support spans or fastening approval.
Formula and exclusions
Full boards = floor((clear opening + internal gap) ÷ (actual board face + internal gap)). Used width = boards × face + (boards − 1) × gap. The remaining space is split equally at the two edges. A board wider than the opening gives zero full boards. No ripped final board or equal-gap optimization is assumed.
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Count the infill. Keep the edges explicit.
DesignHorizontal versus vertical hardwood fencing
Choose board direction by the views, openings and panel rhythm you want to manage.
Read / explore ↗DesignHardwood fence privacy: gaps, coverage and sightlines
Test real viewing angles before settling on an infill gap.
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PlanningLay out the boundary as a sequence
Turn a long boundary into named runs, openings and transition points.
Read / explore ↗