Drywall Joint Compound Calculator
Standard 3-coat joint compound coverage is 100-150 sq ft per gallon; this calculator defaults to the 125 sq ft/gal midpoint, adjustable to match your product.
Drywall Screw Calculator
Screws per 4x8 sheet ≈32 at 12 in OC fastening pattern on 16 in OC studs, per standard drywall installation practice.
Drywall Sheet Calculator
Sheets = ceil(total area x 1.10 waste / sheet area), using standard 4x8 ft (32 sq ft) or 4x12 ft (48 sq ft) drywall sheets.
Insulation Calculator
Batt coverage = (width in x length in) / 144 sq in per sq ft, computed exactly from your stated batt dimensions rather than a rounded constant. R-value per inch: fiberglass R-3.2, cellulose R-3.7, XPS R-5.0, closed-cell spray foam R-6.5, open-cell spray foam R-3.7 (DOE/ASHRAE reference values).
R-Value Calculator
Total R-value = sum of (material R-value per inch x thickness in inches) across each layer, using DOE/ASHRAE reference R/in values.
Thermal Resistance Calculator
Total R = insulation R + other layer R + interior air film (ASHRAE typical R-0.68) + exterior air film (R-0.17). U-value = 1 / total R.