Break the fence into runs
Measure between corners, ends, and gates as separate straight runs.
This prevents a spacing calculation from skipping required terminal or corner posts.
Count posts by bays
For a simple run, bays = ceiling(run length ÷ maximum post spacing) and posts = bays + 1 before special gate or brace posts.
Use the approved layout rather than treating calculator spacing as a structural recommendation.
Calculate rails
Multiply bays by rails per bay, then convert to stocked rail lengths if rails span more than one bay.
Gate framing and braces are separate components.
Calculate face boards
For spaced boards, board module equals actual board face plus clear gap; count modules across each run and adjust end conditions.
Board-on-board and shadowbox patterns require their own overlap geometry.
Verify exterior material requirements
Wood species, preservative treatment, fastener compatibility, ground clearance, wind, frost, and local rules affect the build.
Quantity calculations do not design the fence.