BuildToolsHub US Construction Calculators

Paint & Coatings

Paint Coverage Calculator

Estimate gallons from wall area, coats, and coverage rate.

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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 Paint Coverage Calculator

Estimate interior or exterior paint needs from paintable area, number of coats, and product coverage.

Texture, color changes, and porous surfaces can reduce coverage versus the label.

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.

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About Paint Coverage Calculator

What coverage is typical?

Many paints claim about 350–400 sq ft per gallon per coat on smooth surfaces.

Do I paint ceilings separately?

Yes—measure ceiling area and use ceiling paint coverage.

Primer needed?

Often yes on new drywall or stark color changes—calculate primer coats too.

Is this professional engineering advice?

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

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