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CraftedCalcs

Construction calculators with cited formulas and IRC code references.

Stair calculator live now. Drywall, paver, concrete and more coming. Free, no signup. For DIYers and contractors.

Start with the Stair Calculator →

See what's coming ↓

Featured Calculators

  • Stair Calculator
    Rise, run, and stringer length, with IRC code checks.
    Available now →
  • Sheetrock Calculator
    Drywall sheets, screws, mud, and tape for your room.
    Coming soon
  • Paver Calculator
    Patio, walkway, and fire pit paver counts.
    Coming soon
  • Attic Insulation Calculator
    R-value and coverage area for attic insulation.
    Coming soon
  • Hardwood Flooring Calculator
    Square footage plus waste factor for hardwood install.
    Coming soon
  • Vinyl Siding Calculator
    Siding squares for exterior house wrap.
    Coming soon

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Why CraftedCalcs

Most online calculators show you a single number with no explanation. Most competitors' calculators hide their formula, assume you want only the headline material, and skip waste factors. We do the opposite.

  • Every formula shown — so you can verify the math, not trust it blindly
  • Waste factors explained — 10% for simple installs, 15% for diagonal flooring, more for complex cuts
  • "What else you'll need" sidebars — screws, mud, tape, sealant, nails — the materials beginners forget
  • Code reference checks — IRC, ICC, ACI standards flagged where they apply
  • Clear DIY scope — we flag where a licensed pro is the right call