Observed arrival · 2026-09-06
Nails & Numbers: Construction Calculators That Show Their Work
A collection of U.S. construction calculators that names its governing code or standard, publishes the relevant tables, and explains the assumptions behind each result.
Field notes
Nails & Numbers organizes construction calculators around named references such as IRC R507, AWC DCA 6, IRC R311.7, and NDS design values. The homepage says each tool publishes the table it uses as searchable text, states conditions such as load, grade, wet or dry service, and deflection limits, and includes a worked example. One cited comparison distinguishes a 2-ply 2x10 span of 10 ft 4 in in southern pine from 8 ft 4 in in Douglas fir-larch. The extract does not show the calculators’ actual input screens.
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Editorial observations of this landing page, not a rating.
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