Free Quantity Estimators
for Construction Projects
Accurate material quantities for concrete, lumber, roofing, flooring, paint, and 40+ more. Get bags, boards, squares, and cost estimates in seconds — free, no account needed.
Calculator Categories
View all →Concrete
Calculate concrete volume, bags, and cost for slabs, footings, columns, and more.
Lumber & Framing
Board feet, stud counts, deck lumber, and framing material calculators.
Roofing
Shingles, underlayment, metal roofing, and pitch calculators.
Flooring
Hardwood, tile, carpet, and laminate flooring material calculators.
Paint & Stain
Interior paint, exterior paint, and fence stain coverage calculators.
Framing
Wall framing, header sizing, and structural material calculators.
Fencing
Fence material, post, rail, and picket calculators.
Decking
Deck boards, joists, posts, and composite decking calculators.
Electrical
Wire gauge, circuit load, conduit fill, and outlet spacing calculators.
Plumbing
Pipe sizing, flow rate, and drain slope calculators.
Landscaping
Mulch, gravel, topsoil, and sod calculators for yard and garden projects.
Masonry
Brick, block, paver, and mortar calculators for walls, patios, and driveways.
HVAC
Air conditioner sizing, insulation R-value, and duct calculators.
Drywall
Drywall sheet, joint compound, and tape calculators for walls and ceilings.
Specialty
Pool volume, stucco, waterproofing, and other specialty construction calculators.
Most Popular Calculators
Concrete Slab Calculator
ConcreteCalculate exactly how much concrete you need for a slab — cubic yards, bags of pre-mix, and estimated cost.
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Board Feet Calculator
Lumber & FramingCalculate board feet of lumber from thickness, width, and length. Get linear feet and cost estimates.
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Roofing Shingles Calculator
RoofingCalculate the number of shingle squares, bundles, ridge cap, and roofing nails needed for your roof.
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Interior Paint Calculator
PaintCalculate how many gallons of paint and primer you need for any room — walls, ceiling, and trim.
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Hardwood Flooring Calculator
FlooringCalculate square footage, number of boxes, and cost for hardwood flooring installation.
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Tile Calculator
FlooringCalculate the number of tiles, bags of grout, thinset mortar, and tile spacers needed for a tile project.
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Why Use Our Construction Calculators?
Accurate material estimates save time and money. Ordering too little means a costly return trip to the store mid-project. Ordering too much wastes money on materials you'll never use. Our calculators use industry-standard formulas — ACI specs for concrete, manufacturer coverage rates for paint, AWC span tables for lumber — so your estimates are right the first time.
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Contractor-grade formulas
Based on ACI, NRCA, and manufacturer specs — the same math pros use.
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Cost estimates included
Every calculator shows material cost so you can budget before you buy.
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Buy links to top stores
Tap through to Home Depot or Lowe's with the right product pre-selected.
All 48 Calculators
Frequently Asked Questions
Are these construction calculators free?
Yes. All calculators on Quantity Estimator are completely free to use with no account required. Enter your measurements and get instant material estimates.
How accurate are the material estimates?
Our calculators use industry-standard formulas: ACI 318 for concrete, NRCA guidelines for roofing, NEC ampacity tables for wire sizing, and manufacturer coverage rates for paint. Results include a 10% waste factor where appropriate. Always confirm with your supplier before placing a large order.
Can I save or share my calculations?
Yes. After calculating, the URL updates with your inputs automatically. Copy the URL to share or bookmark your calculation. You can also use the Copy Results button to save your estimate as text.
Do the calculators work on mobile?
Yes. All calculators are fully responsive and work on phones, tablets, and desktops. No app download needed.
What materials do the calculators cover?
The site covers 15 categories: concrete, lumber, roofing, flooring, paint, framing, fencing, decking, drywall, masonry, landscaping, HVAC, electrical, plumbing, and specialty (pool, solar, spray foam). Each category has multiple calculators targeting specific tasks like slab pours, shingle ordering, or wire gauge sizing.
Should I add a waste factor to my material order?
Yes — always add 10% to any material order. Cuts create offcuts, forms overfill slightly, and tiles break during installation. Most calculators on this site include a built-in 10% waste factor, but you can adjust it. For complex shapes or diagonal tile patterns, use 15%.
Are these calculators suitable for professional contractors?
Yes. The formulas are based on the same standards professionals use: ACI 318 (concrete), AWC span tables (lumber and framing), NRCA (roofing), and NEC 310.15(B)(16) (electrical). That said, these are estimating tools — structural decisions for permitted work should be reviewed by a licensed engineer.