Deck Railing Calculator
Estimate deck-railing posts, rail sections, balusters, fastener packs and material cost for one or more railing runs.
Default project preview
$1,892.80
Railing posts
9
Top and bottom rails
16
Balusters
110
Average span
5.5 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Railing spans = round up (net railing length ÷ maximum post spacing). Posts = spans + 1. Rails and balusters are rounded from stock length and entered spacing.
FAQ
Deck Railing Calculator questions
Does this include stair-railing geometry?+
No. Stair rails require sloped length, stair-specific posts, handrail details and code-compliant transitions.
Why are post locations removed from the baluster estimate?+
Posts occupy positions along the railing run, so the simple spacing estimate deducts one position per span.
Can this verify railing strength?+
No. Post attachment, blocking, fasteners and product ratings require structural verification.