Construction · Index
Construction math, done right.
Free calculators for the materials you order and the things you build. Imperial or metric. With the waste factor done right and the rounding-up step nobody else does.
Most calculators give you a raw number and call it done. Real orders happen in supplier increments: half-yard of ready-mix, whole bundles of shingles, full sheets of drywall. We do the rounding here so you don't run short on site.
01 Concrete & masonry
- Concrete volume calculatorslabs · columns · footings
- Concrete slab thickness4 in default · when to go 5–6 in · cost of thicker
- Concrete curing timestrength at 1 · 3 · 7 · 28 days · psi or MPa
- Concrete bag calculator40 · 60 · 80 lb compared
- Cubic yards to bags calculator45 · 60 · 90 bags per yard · fast-set
- Concrete bag yieldsft³ & m³ by bag size · per-pound constant
- Ready-mix vs bagged concretebreak-even volume · short-load fee · labor ceiling
- Concrete weight calculatorpounds · tons · dead load · hauling
- Concrete footing calculatorstrip footing · width by soil & stories · bags
- Concrete steps calculatorstepped-pour volume · solid vs sloped fill · bags
- Concrete mix ratio calculator1:2:3 site mix · cement/sand/gravel · water-cement strength
- Sonotube volume calculatorround footings · frost depth · bags
- Concrete cylinder volume calculatorpiers & columns · belled base · bags
- Fence post calculatorconcrete per hole · depth by frost · bags
- Shed foundation calculatorskid vs pier count · gravel pad · permit & frost thresholds
- Brick calculatormodular · queen · utility compared
- Concrete block wall calculator8×8×16 · half-blocks · mortar bags
- Retaining wall block calculatorblocks · caps · drainage gravel · base
- Rebar spacing calculatorbar count · ties · chairs · weight
- Concrete countertop calculatorGFRC vs solid · bags · weight
- Stucco coverage calculatorscratch · brown · finish · bags
- Concrete sealer calculatorpenetrating vs acrylic · broom/smooth/stamped · gallons
02 Framing & lumber
- Board foot calculatorboard feet · nominal vs actual · $/bf vs $/lin ft
- What is a board foot?definition · nominal vs actual · hardwood surface measure
- Lumber dimensions chartnominal vs actual · inches & mm · PS 20
- Floor joist span table4 species compared · IRC R502.3.1(2)
- Joist span calculatorcoming soon
- Wall framing calculatorstuds · plates · headers · cripples
- Stud count calculator12 · 16 · 24 in oc compared · corner & partition backing
- Door rough opening calculatoropening from slab + jamb & shim allowance · header length
- Window rough opening calculatoropening from window unit size + shim gap by frame material · header length
- Header size calculatorbuilt-up header span by opening & building width · jack studs · IRC R602.7(1)
- OSB sheathing calculatorwall & roof sheet count · gross area, openings left in · H-clip count
- Subfloor calculatorsheet count + panel thickness by joist spacing · gross platform area
- Trim calculatorbase · crown · door & window casing · sticks
- Screws vs nails for framingcode fastener schedule · nail take-off
- Nail & screw size chartpenny sizes to inches & mm · screw gauge · common framing use
- Deck materials calculatorjoists · decking · posts · railing
- Deck cost calculatormaterials bill × your local prices · not a $/ft² average
- Deck beam span calculatorbeam span by species & joist span · smallest beam that clears your posts · IRC R507.5
- Stair calculatorrisers · treads · stringer · IRC check
03 Drywall & paint
- Drywall calculator4×8 · 4×10 · 4×12 + mud
- Drywall mud calculatorready-mix vs setting-type · buckets · bags
- Insulation R-value calculatorsettled depth by material · bags · batt compression
- Vapor barrier calculatorpoly roll count · overlap as seams · climate-zone check
- Paint calculatorsurface-adjusted · gallons or litres
- How much paint do I need?gallons · can figure vs your wall
- Paint sheen guidegloss units by sheen · which sheen per surface
- Deck stain calculatorsemi-transparent vs solid · 2nd-coat coverage
- Wallpaper calculatorrolls by the drop · pattern repeat
04 Tile & flooring
- Tile calculatorwaste by pattern · grout joint
- Backsplash tile calculatorrun × 18 in band · outlet cutout allowance · subway vs mosaic sheets
- Peel and stick vs mortar backsplashmaterial cost · ~4-day mortar cure vs 0 · 120°F peel-stick heat limit
- Grout calculatorvolume by tile size · joint · thickness
- Thinset calculatorbag count by trowel notch size
- Underlayment calculatorcement board · DITRA · plywood by application
- Shower pan calculatordry-pack mortar bed by slope to drain · pre-slope bed counted · bag count
- Ceiling tile calculatordrop-ceiling tiles + grid parts · mains · cross tees · wall molding · wire
- Irregular room square footageL-shape · bay-window trapezoid · angled corner
- Flooring calculatorplank waste by board length
- Hardwood flooring nail calculatorcleats/staples by spacing · per-ft² count tracks board width · end-anchor premium
- Vinyl plank calculatorcartons · transitions · expansion gap
- Vinyl vs laminate flooringmaterial cost · mil vs AC rating · HDF vs SPC core
- Engineered vs solid hardwood flooringmaterial cost · grade & subfloor gate · wear-layer refinishing
- Carpet calculatorroll width · seams · square yards
- Epoxy flooring calculatorcoverage by solids % & dry-film mils · coats
- Self-leveling concrete calculatorbags by area & average fill depth · coverage scaled by depth · single-pour limit
05 Roofing & siding
- Roof shingles calculatorpitch factor · bundles · ridge cap
- Rafter length calculatorrise/run · ridge deduction · overhang
- Roof pitch calculatorrise/run · degrees · pitch factor
- Measure roof pitchlevel drop · phone angle · rise-in-12
- Siding square footage calculatorgable area from pitch · squares · waste
- Soffit and fascia calculatoreave vs rake linear feet · pitch factor · panels
- Gutter calculatorlinear feet · downspout count by roof area & rainfall rate
- Metal roofing calculatorpanel count by net coverage width · PBR/5V/standing seam · end-lap
06 Earthworks
- Excavation calculatorbank vs loose cubic yards · soil swell factor · truckload count
- French drain calculatortrench gravel · pipe · filter-fabric width per lin ft · 1% slope check
- Gravel calculatorvolume · weight · tonnage
- Asphalt calculatortonnage · compacted depth · min lift
- Patio paver calculatorpavers · sand · base · edging
- Paver jointing sand calculatorpolymeric sand bags by joint width · bedding sand kept separate
- Flagstone calculatortons by area & thickness · coverage per ton by stone · breakage allowance
- Fence panel calculatorpre-built panels · posts · on-center spacing
- Landscape edging calculatorlinear feet · coils · stakes by curve radius
- Mulch calculatorcubic yards · bag count · bag-vs-bulk break-even
- Sod calculatorpallets · slabs/rolls · pallet coverage is an input
- Topsoil calculatorcubic yards · settling allowance · bag-vs-bulk break-even
- Sand calculatorcoming soon