Home Project Calculator

Comprehensive home improvement calculator for paint, flooring, tile, drywall, concrete, roofing, deck, and fence projects. Get material quantities, labor estimates, and shopping lists.

Project Type is the master switch here -- it selects which of eight completely independent calculations runs (paint, flooring, tile, drywall, concrete, roofing, deck, or fence), each with its own dimensions, material options, and cost formula, and each producing its own shopping list. Labor Type sets an hourly rate (DIY at $0, up through Specialist at $100/hr) that multiplies against the labor-hours estimate for whichever project is active -- though three of the eight modes put a floor under that rate internally, on the reasoning that those trades are less commonly done without paid labor: tile and concrete both floor the rate at Professional ($75/hr), so DIY and Handyman all bill the same as Professional, and roofing floors it at Specialist ($100/hr), which makes all four Labor Type settings identical for a roof. Paint, flooring, drywall, deck, and fence apply whatever you pick, DIY's $0 included. Waste Factor adds a percentage buffer to the raw material quantity before it is rounded up to a purchasable unit (gallons of paint, boxes of flooring, sheets of drywall, and so on), which is why doubling Waste Factor does not always visibly change the displayed quantity -- if the raw amount doesn't cross the next whole-unit threshold, the rounded-up purchase quantity stays the same even though the underlying raw need increased. In Paint mode specifically, Number of Coats changes how much paint you need to buy but does NOT change the reported Paintable Area -- that figure describes the physical wall/ceiling/ baseboard surface being painted, which stays the same regardless of how many times you coat it; only Gallons Needed and the resulting Material Cost scale with the coat count.