BuildToolsHub US Construction Calculators

Framing & Lumber

Header Lumber Estimator

Estimate header and king/jack stud lumber at openings.

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Educational US estimate only. Not engineering, structural, code, or professional construction advice. Mix designs, codes, and local conditions vary — verify with licensed professionals and your building department.

Estimator methodology

BuildToolsHub takeoffs separate net measured quantities from ordered quantities. Ordered qty = net × condition-based waste, then rounded for plant or package sizes (e.g. ready-mix to the nearest 0.5 yd³).

  • Concrete bags: Quikrete / SAKRETE published yields (80 lb ≈ 0.60 ft³). Ready-mix contingencies follow ASTM C94 purchaser practice.
  • Rebar: CRSI published lb/ft tables; optional lap allowance ≈ 40× bar diameter (confirm with drawings).
  • Roofing: NRCA squares (100 ft²); pitch factor √(1+(rise/12)²); ~3 bundles/square for standard shingles.
  • Aggregates / fill: ASTM C29-style densities; swell/compaction allowances for haul and place volumes.
  • Masonry: BIA / NCMA common unit factors (e.g. ~1.125 CMU/ft² for 8×16 face).

Use the Order tab for a supplier call sheet and the Assumptions panel for the exact factors applied to this run.

Why use Header Lumber Estimator

Estimate board feet for built-up headers and jack/king studs based on opening widths and wall thickness.

Header size is structural—confirm spans and loads with tables or an engineer.

How to use

  1. Enter job dimensions. Pick a pour/layout condition to set industry waste %, or choose Custom.
  2. Review Net vs Order on the Summary tab — order the rounded quantity, not net alone.
  3. Open the Order tab for a supplier checklist, then print, export CSV, or share the link.

Related searches

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About Header Lumber Estimator

What size header do I need?

Depends on span, load, and species. This tool estimates quantity, not required size.

Are double headers common?

Yes for many openings; some use engineered lumber instead.

Include cripples?

Add cripple studs above/below openings as a separate count.

Is this professional engineering advice?

No. Educational estimates only. Verify with a licensed professional and local codes.

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