ProjectCalcWorks
Interior project tools

Interior & Flooring Calculators

Turn measured surfaces into whole purchase units while keeping product coverage and waste assumptions explicit.

Drywall CalculatorSheets from wall or ceiling area, openings and sheet size. Flooring CalculatorPurchase area and whole cartons from exact product coverage. Insulation CalculatorNet area and whole packages from exact product coverage. Blown-In Insulation CalculatorWhole bags from exact product-chart coverage. Paint CalculatorGallons from paintable area, coats and product coverage. Tile CalculatorPurchase area, whole tiles, boxes and optional cost. Stud Wall CalculatorUseful when the measured wall surface is part of a new framing project.

Whole-unit rounding happens at the end

The purchase calculators keep measured area separate from the quantity you need to buy. After your chosen waste or extra-material percentage is applied, drywall is divided by sheet coverage, flooring and tile by product box coverage, insulation by package coverage, blown-in insulation by coverage per bag, and paint by coverage per gallon. Whole purchase units are then rounded up.

That distinction matters because rounding too early can compound error. Intermediate values retain full precision; user-facing quantities are rounded only where the purchasing decision requires it.

Product specifications still control

Drywall presets cover common sheet dimensions documented by USG, while a custom sheet size remains available. Flooring/tile box coverage, insulation package coverage, blown-in bag coverage and paint coverage are never guessed: enter the value printed on the exact product specification or manufacturer chart. See Sources & Data for the verification policy.