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
- Sonotube volume calculatorround footings · frost depth · bags
- Concrete cylinder volume calculatorpiers & columns · belled base · bags
- Fence post calculatorconcrete per hole · depth by frost · bags
- 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
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
- Trim calculatorbase · crown · door & window casing · sticks
- Screws vs nails for framingcode fastener schedule · nail take-off
- Deck materials calculatorjoists · decking · posts · railing
- 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
- Paint calculatorsurface-adjusted · gallons or litres
- How much paint do I need?gallons · can figure vs your wall
- 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
- Grout calculatorvolume by tile size · joint · thickness
- Thinset calculatorbag count by trowel notch size
- Underlayment calculatorcement board · DITRA · plywood by application
- Flooring calculatorplank waste by board length
- Vinyl plank calculatorcartons · transitions · expansion gap
- Carpet calculatorroll width · seams · square yards
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