Construction calculators that get the numbers right, the first time.
Free construction calculators for roofing, masonry, framing, decking, fencing, and interior finishing, built for contractors and DIYers who need a number now. Enter your dimensions and the material estimate updates as you type.
23
Calculators
$0
Always free
Instant
Live results
Every calculator, one job site
The material estimates contractors and DIYers look up most, one page each.
Roofing
Masonry & Landscaping
Concrete Calculator
Cubic yards and bag counts for any slab or footing
Calculate nowConcrete Cost Calculator
What a concrete slab or driveway actually costs
Calculate nowDriveway Cost Calculator
Concrete, asphalt and gravel priced side by side
Calculate nowGravel Calculator
Tons and cubic yards of gravel for any area
Calculate nowMulch Calculator
Cubic yards and bags of mulch for your beds
Calculate nowTopsoil Calculator
Cubic yards, tons, and bags of topsoil for any area
Calculate nowCinder Block Calculator
Blocks and mortar bags for a CMU wall build
Calculate nowRetaining Wall Calculator
Blocks, rows, and cap units for your wall build
Calculate nowAsphalt Calculator
Tons and cubic yards of asphalt for your driveway
Calculate nowRebar Calculator
Grid spacing, linear feet & sticks for a slab
Calculate nowDecking & Fencing
Interior
Paint Calculator
How many gallons of paint the room actually takes
Calculate nowFlooring Calculator
Square footage and boxes, with waste factored in
Calculate nowInsulation Calculator
Rolls or batts needed for any wall or ceiling area
Calculate nowBlown-In Insulation Calculator
Bags needed for attic cellulose or fiberglass insulation
Calculate nowBaseboard Calculator
Linear feet and pieces of trim for any room
Calculate nowHow it works
Three steps to a materials list you can order from.
Pick your calculator
Roofing, masonry, framing, decking, fencing, or interior finishing.
Enter your measurements
The dimensions you already have. Length, width, depth, or rise and run.
Get instant results
Quantities, costs, and material counts update live as you type.
Every formula here is the one the trades already use. We are not doing anything clever with it, just the arithmetic, instantly, without a calculator app and a notepad.
Built for contractors, estimators, and DIY builders
Getting a material quantity wrong costs money in both directions. Over-order and you have paid for a pile of leftovers. Under-order and the job stops while you drive back to the supplier. Each calculator here does one estimate properly, which is faster than a spreadsheet and harder to get wrong than doing it in your head.
Standard trade math
Cubic feet to cubic yards on a concrete pour, slope factors on a roof, board feet on a lumber order. Nothing proprietary, just the formulas already in use, applied consistently.
Waste allowances included
Estimates account for real job-site cutting losses, between 5% and 15% depending on the material and the layout. A herringbone floor wastes far more than a straight one, and the numbers here reflect that.
Frequently asked questions
Yes. No sign-up, no email gate, no account. Open a page and start typing. There is nothing to unlock and no paid tier holding back the useful features.
The arithmetic is exact and the formulas are the standard ones the trades already use. What varies is everything the math cannot see: waste, site conditions, how a particular brand actually behaves. That is why we round sensibly and tell you to add 5 to 10% on material orders, and why we won't pretend the number is final.
No. Everything runs in the browser as you type. Nothing to download, no plugin, no spreadsheet to keep a copy of.
Yes. Every calculator is built to work one-handed on a phone, which is the realistic case: you are holding a tape measure with the other hand.