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.

Free · neutral (no brand lock-in) · works offline · printable list

DIY Material Calculators

One clean hub for 11 estimates. Each brand has its own tool, but they push their products — here you get generic rates you can tweak, exact vs buy quantities, and a print-ready list.

🎨 Paint gallons
walls, 2 coats, 350 sqft/gal

🧱 Tile boxes
+10% cuts

🪣 Concrete bags
slab L×W×D

🌱 Mulch yd³
area × depth

🧻 Wallpaper rolls
drops + repeat

🪵 Fence
pickets + posts + concrete

🪚 Laminate flooring
+10%, packs

⬜ Drywall sheets
walls+ceiling ÷32

🪟 Deck boards
+10% cuts & gaps

🪴 Raised-bed soil yd³
L×W×H ÷27

🔥 Heater BTU + cost
sqft × climate factor

1 · Paint — gallons

Wall area sqft Doors/windows sqft Coats Coverage/gal

Formula: (area−openings)×coats ÷ coverage. Standard latex ≈350 sqft/gal; porous walls use 300.

2 · Tile — boxes

Floor sqft Sqft / box

3 · Concrete — 60/80-lb bags

Length ft Width ft Thick in 80-lb $/bag Ready-mix $/yd³

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

4 · Mulch — cubic yards

Area sqft Depth in

5 · Wallpaper — rolls

Wall width ft (total) Height ft Roll width in Roll length ft Repeat in (0=none)

Drops = ceil(totalWidth ÷ rollWidth); each drop wastes one repeat. +10% trim included in buy-up.

6 · Fence — pickets, rails, posts, concrete

Length ft Picket width in Gap in Post spacing ft

7 · Laminate — packs

Room sqft Sqft / pack

8 · Drywall — 4×8 sheets

Wall sqft Ceiling sqft

Sheet = 32 sqft. Add 10% cuts; subtract large openings first.

9 · Deck — boards

Deck area sqft Board width in Gap in Board length ft

Rows = width ÷ (board+gap); boards = rows × length ÷ board length, +10%.

10 · Raised-bed soil — cubic yards

Length ft Width ft Depth in

yd³ = L×W×(D/12) ÷ 27. Example 8×4×1ft = 32 ft³ = 1.19 yd³.

11 · Heater BTU + running cost

Room sqft Climate Hours/day $/kWh

BTU = sqft × factor. kW = BTU ÷ 3412. Mini-splits: 9k/12k/18k/24k BTU pick first size above need.

Guides

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 standard. Always verify with your product label. Keywords: how many gallons / bags / rolls / pickets do I need.