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How much do I need?
Island-standard factors, instant answers, one tap to cart. No reloads, no spreadsheets.
Concrete slab
bags of mix — 45 bags ≈ 1 cu yd (80 lb)
≈ 1.48 cu yd → 67 bags
67 bags for 12×10 ft at 4"
Block wall
8×8×16 CMU — 1.125 blocks per sq ft + mortar
≈ 270 blocks · 8 bags mortar
270 blocks for 30×8 ft
Rebar for a slab
#4 bar grid · 20 ft lengths · 5% lap allowance
≈ 196 ft → 11 × 20 ft bars
11 bars at 16" grid
Paint
≈ 350 sq ft per gallon per coat
≈ 3 gallons
3 gal for 400 sq ft × 2
Stud framing
studs on center + 3 plates per run (8 ft lengths)
≈ 16 studs + 9 plate lengths
16 studs + 9 plates
Rules of thumb, not engineering.
Estimates use standard island factors (45 bags/cu yd, 1.125 block/sq ft, 350 sq ft/gal). For structural work, send the drawings on WhatsApp — a supplier counter-checks the takeoff free with any quote.