BuildHowMuch

Updated for 2026 · Store sizes & average prices

How much do you need, and how much will it cost?

Enter your measurements in feet and inches. Get a shopping list in the sizes stores actually sell, a cost estimate you can change to your local prices, and a drawing of the layout.

How many bags of concrete?Price out a deck
Calculators
8Plus 3 cost guides
Prices tracked
63Collected September 17, 2026
Sources cited
119Retailers, makers, codes
80 lb bag of concrete
0.60 cu ftQUIKRETE data sheet

Concrete & Stone

Bags, yards and tons for slabs, footings, post holes, paths and bases.

CalculatorConcrete CalculatorHow many 40, 50, 60 or 80 lb bags — or yards of ready-mix — your pour needs.10×10 ft slab, 4 in: 62 × 80 lb bagsCalculatorGravel CalculatorTons, cubic yards and bags of crushed stone, pea gravel and more.Crushed stone from $30/tonCost guideConcrete Cost 2026Ready-mix per yard, bag prices and installed slab costs by size.Ready-mix $110–$150/yd

Deck & Yard

Complete materials lists for decks and fences, plus mulch and topsoil for the beds around them.

CalculatorDeck CalculatorBoards, joists, beam, posts, screws and footings — with a framing diagram.Built on AWC DCA 6 span tablesCalculatorFence CalculatorPosts, rails, pickets and concrete per post for privacy, picket and split rail fences.6 ft PT picket avg. $2.63CalculatorMulch CalculatorBags or yards of mulch and topsoil, and when bulk delivery pays off.2 cu ft bag avg. $3.47Cost guideDeck Cost 2026Installed price per square foot by material, and totals by deck size.Installed $25–$60/sq ftCost guideFence Cost 2026Price per linear foot by fence type, and totals by yard length.Wood, installed $20–$50/ft

Interior

Paint, flooring and drywall for one room or the whole house.

CalculatorPaint CalculatorGallons for every room, and the cheapest mix of 1- and 5-gallon cans.Coverage from manufacturer data sheetsCalculatorFlooring CalculatorBoxes of laminate, vinyl plank, hardwood or tile with the right waste allowance.Laminate from $0.99/sq ftCalculatorDrywall CalculatorSheets, joint compound, tape and screws from USG coverage rates.1/2 in 4×8 sheet avg. $16.68

Guides

The numbers behind the calculators, explained in plain English.

GuideHow Much Concrete Does a Bag Make?40, 50, 60 and 80 lb yields, bags per yard and why to add 10%.ConcreteGuideHow Much Does It Cost to Build a Deck?What contractors charge, and a line-by-line DIY materials list.DecksGuidePaint Coverage ExplainedWhy one gallon never covers 400 sq ft on a real wall.PaintGuideGravel, Crushed Stone or Pea Gravel?Which stone each project needs, and how much to order.Gravel & stoneGuideDrywall Sizes and Sheet Count4×8 vs 4×12, thicknesses, and how many sheets a room takes.Drywall

A shopping list, not just a number

Results are rounded up to whole bags, boxes, sheets and boards in real store sizes, with waste allowances you can see and change.

Every figure sourced

Yields, coverage rates and span tables come from manufacturer data sheets and building guides; prices from public retail listings and cost guides, with dates.

Checked against other tools

Each calculator is tested with worked examples and compared with established calculators before it goes live. Nothing you enter leaves your browser.

Estimates for planning purposes only, not professional construction advice. Check local building codes and your product's instructions before you build. Prices are national averages collected from public retail listings and cost guides and will differ in your area. BuildHowMuch is independent and not affiliated with, endorsed by or paid by any retailer or manufacturer mentioned on this page. Nothing you enter is stored or sent anywhere.