Building & DIY Materials

How much material do you actually need?

Enter your measurements and get the exact number of bags, gallons, or bundles to buy — rounded up, with a copy-ready shopping list. Free, accurate, no sign-up.

Concrete CalculatorCubic yards and how many 40/60/80 lb bags for a slab, footing, or pad.Paint CalculatorGallons of paint for a room from wall size, coats, and coverage.Mulch & Soil CalculatorCubic yards and bags of mulch or topsoil for a bed at any depth.Gravel CalculatorTons and cubic yards of gravel for a driveway, path, or base.Roofing CalculatorSquares and shingle bundles from your roof footprint and pitch.Drywall CalculatorSheets, joint compound, and tape for a room’s walls and ceiling.Flooring CalculatorHow many boxes of flooring for a room, with a waste allowance.Board Foot CalculatorBoard feet and cost for lumber from its dimensions.Deck Board CalculatorDeck boards and joists for a deck from its size and spacing.Rebar CalculatorSuggested rebar size, spacing, and sticks to buy for a slab-on-grade.Paver CalculatorPavers, bedding & joint sand, edging and spikes for a patio or walkway.Brick CalculatorBricks and bags of mortar for a wall, with a waste allowance for cuts.

Estimators that tell you what to buy, not just the math

Most calculators hand you a volume and stop. These turn that number into a purchase decision — how many 80 lb bags, how many gallons, how many bundles — so you can walk into the store (or check out online) with confidence. Every formula is verified against manufacturer spec sheets and industry standards.

Why these are different

  • A real answer: The headline is what to buy — “46 × 80 lb bags” — not a raw cubic-yard figure you still have to convert.
  • Copy-ready shopping list: One tap copies your quantities so you can paste them into a note or send them to whoever’s doing the buying.
  • Shareable: Your inputs live in the page link — bookmark your project or send it to a contractor.
  • Sourced & verified: Bag yields, coverage rates, and pitch math trace to manufacturer specs and standards — and pass an automated accuracy test on every build.