Roofing Calculator

Free tool — embed on your site for free.

You need
  • Roof area
    23 squares (2,277.00 sq ft)
    1,800 sq ft footprint × 1.15 pitch multiplier + 10% waste
  • Shingle bundles
    69 bundles
    Asphalt: ~3 bundles per square. Metal/cedar/slate ship as panels or per-piece.
  • Underlayment rolls
    6 × 400 sq ft rolls
    Synthetic underlayment covers 200-400 sq ft; 15# felt ~400 sq ft.
  • Roofing nails
    57 lb
    ~2.5 lb per square at 4 nails per shingle. Use 6 nails in high-wind zones.
  • Material cost estimate
    $3,985
    23 squares × ~$175/sq (25-30 years lifespan)
  • Total installed estimate
    $9,677
    Material + labor at $250/sq. Regional variance: ±30%.

Roofing is almost never a DIY job. Hot asphalt, 2-story fall risk, insurance claim complexity, and the warranty requirement for licensed installers all point to hiring a pro. Use this calculator to sanity-check contractor quotes.