Calculate exact quantities for paint, tile, laminate, wallpaper, drywall, concrete slabs, and appliance electricity costs with zero waste. Instant Imperial (ft/gal/lb) & Metric (m/L/kg) conversion.
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For standard straight installation, industry pros recommend adding 7–10% extra material. For diagonal layouts or rooms with many corners and alcoves, add 12–15% to account for cuts and future repairs.
When wallpaper has a pattern repeat (e.g., 32 cm or 12.6 in), each vertical strip must be cut longer to align the design, reducing the number of usable strips you get per roll.
A standard drywall installation uses roughly 30–35 screws per sheet (spaced every 20–25 cm along studs), plus perimeter track profiles, vertical studs every 40–60 cm, and joint compound for seams.
One cubic meter of concrete requires roughly 80 bags of 25 kg dry mix (or 40 bags of 50 kg). One cubic yard requires roughly 45 bags of 80 lb pre-mixed concrete (or 60 bags of 60 lb).