How much wastage should I add?

10% for tile/flooring/wallpaper cuts; 5-10% for paint; 5% for concrete. Our calculators include it and show exact vs buy quantities.

Are these calculators neutral?

Yes. Brand tools exist but push their own products; this hub uses generic coverage rates you can adjust.

DIY Material Calculators — Paint, Tile, Concrete, Mulch, Wallpaper, Fence, Flooring, Drywall, Deck, Soil, BTU (Free)

1 · Paint — gallons

Wall area (sqft)Total wall area

Doors/windows (sqft)Subtract openings

Coats

Coverage / galStandard latex ~350

Updates live as you type

Formula: (area − openings) × coats ÷ coverage. Porous walls use 300.

2 · Tile — boxes

Floor area (sqft)

sqft per box

3 · Concrete — 60/80-lb bags

Length (ft)

Width (ft)

Thickness (in)

80-lb $/bag

Ready-mix $/yd³

Volume ft³ = L×W×(D/12). 80-lb ≈0.6 ft³, 60-lb ≈0.45 ft³. +5% waste.

4 · Mulch — cubic yards

Area (sqft)

Depth (in)

5 · Wallpaper — rolls

Total width (ft)

Height (ft)

Roll width (in)

Roll length (ft)

Repeat (in, 0=none)

Drops = ceil(width ÷ rollWidth). Each drop wastes one repeat. +10% trim.

6 · Fence — pickets, rails, posts, concrete

Length (ft)

Picket width (in)

Gap (in)

Post spacing (ft)

7 · Laminate — packs

Room (sqft)

sqft per pack

8 · Drywall — 4×8 sheets

Wall sqft

Ceiling sqft

Sheet = 32 sqft. Add 10% cuts.

9 · Deck — boards

Deck area (sqft)

Board width (in)

Gap (in)

Board length (ft)

10 · Raised-bed soil — cubic yards

Length (ft)

Width (ft)

Depth (in)

yd³ = L×W×(D/12) ÷ 27. 8×4×1 ft = 1.19 yd³.

11 · Heater BTU + running cost

Area (sqft)

BTU / sqft

Hours / day

$/kWh

BTU = sqft × factor. Mini-splits: 9k/12k/18k/24k BTU

Guides

Concrete cost → Bags per yard → Paint coverage → Wallpaper repeat → Mulch depth → Posts & concrete → Tile wastage → Drywall sheets → Heater BTU → Deck & soil →

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Methodology

Generic rates, adjustable. Paint 350 sqft/gal; tile/flooring/wallpaper +10%; concrete 0.6/0.45 ft³ per 80/60-lb bag +5%; fence posts every 8 ft, 2–3 bags 50-lb per post. Verify with product label. Keywords: how many gallons / bags / rolls / pickets do I need.