Free · neutral (no brand lock-in) · works offline · printable list
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.
Formula: (area−openings)×coats ÷ coverage. Standard latex ≈350 sqft/gal; porous walls use 300.
Volume ft³=L×W×(D/12). 80-lb bag ≈0.6 ft³, 60-lb ≈0.45 ft³. Add 5% waste.
Drops = ceil(totalWidth ÷ rollWidth); each drop wastes one repeat. +10% trim included in buy-up.
Sheet = 32 sqft. Add 10% cuts; subtract large openings first.
Rows = width ÷ (board+gap); boards = rows × length ÷ board length, +10%.
yd³ = L×W×(D/12) ÷ 27. Example 8×4×1ft = 32 ft³ = 1.19 yd³.
BTU = sqft × factor. kW = BTU ÷ 3412. Mini-splits: 9k/12k/18k/24k BTU pick first size above need.
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.