The numbers every project actually needs.
Concrete, framing, electrical, HVAC, roofing, plumbing, and every trade in between — measure once, order right.
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Hand-picked starters.
Order the right pour, every time.
Concrete, asphalt, gravel, mulch — see exact volume and bag counts before you call the supplier.
Concrete Slab Calculator
Drag the slab dimensions — the 3D model and bag count update instantly.
Concrete Mix
Portland, sand, and aggregate ratios for the right PSI — by batch volume.
1 : 2 : 3standard 3,000 PSI mixBoard-Foot Lumber
Pick board size and count — instant board-feet and a material cost estimate.
Right-size by climate zone.
BTU sizing varies wildly by latitude — pick your zone and room size to get the actual heating/cooling target.
HVAC BTU by Climate Zone
Five US climate zones map to BTU-per-square-foot multipliers. Pick yours, drag the room area, get an exact target.
Furnace Sizing
Right-size BTU output by climate, square footage, and insulation level.
~64k BTU2000 ft² · Zone 4Bigger than one calculator? Follow the flow.
Multi-step paths that string the right construction tools together in the order most people actually use them — with your numbers carried from step to step.
Size it right before you build.
Beams, columns, joists, stairs, and framing — engineering numbers from IRC/IBC tables before the inspector arrives.
Staircase Calculator
Calculate stair rise, run, stringer length, and angle with IRC R311.7 compliance — enter total rise and get a code-legal step layout instantly.
7⅛" rise · 10⅜" runcode-compliant · 13 stepsStud & Wall Framing Calculator
Stud count, header sizes, plate lumber, and sheathing for wall framing — enter wall dimensions and on-center spacing to get a full takeoff.
21 studs16 ft wall · 16" o.c.Decks, patios, fences — built to spec.
Plan board counts, post layout, and bag-counts for outdoor projects.
Deck Material Calculator
Joist count, decking boards, fasteners, and post hole concrete — every line item before you hit Home Depot.
86 boards12×16 deck · 16" o.c.Fence Calculator
Post count + rail length + picket spacing — by run length and style.
18 posts150 ft · 8 ft o.c.Wire it right the first time.
Wire sizing, voltage drop, conduit fill, and panel load — the NEC math that keeps inspectors happy.
Wire Size Calculator
Pick amperage and distance — get the minimum AWG that meets the 3% voltage-drop rule.
Ground Fault (GFCI)
Where GFCI/AFCI protection is required and the trip-current thresholds by location.
5 mAClass A GFCI tripBundles, squares, and pitch.
Shingle bundles, gutter sizing, and pitch-to-rise translations for any roofline.
Shingles Calculator
Set the roof area and pitch — waste factor adjusts automatically for steep slopes.
Gutter Size
Match gutter capacity to roof area + rainfall intensity.
6" K-style1800 ft² · 5"/hrPipe size, drain slope, septic load.
Sizing the carry pipe right the first time saves digging twice.
Pipe Size Calculator
Sizing for water supply and DWV — by fixture units and run length.
¾" copper6 fixtures · 50 ftSeptic Tank Size
Tank size by bedroom count + flow rate (state code-tested ranges).
1,500 gal4 BR · standardLawn, beds, and irrigation.
Sod Calculator
Drop your yard area in — pallet count, square-yard total, and a ballpark cost from the local average pop out instantly.
Grass Seed
Pounds of seed by lawn area and grass type — new-lawn vs overseed rates.
~16 lb2,000 ft² · new lawnTile, plank, paint — square-footage math.
Paint Calculator
Room dimensions in, gallons + cost out — counts walls, accounts for coats, and assumes 350 ft²/gal coverage.
Tile Calculator
Box count from total area, tile size, and waste factor.
~3 boxes200 ft² · 12"×12" · 10% wasteDebris, dumpsters, and disposal costs.
Estimate demolition debris weight by material type, match it to the right dumpster size, and get a disposal cost range before the wrecking ball swings.
Dumpster Size Calculator
Find the right dumpster size for your project. Enter debris types and volumes to get a recommended size, weight estimate, and rental cost range.
10-yd roll-offtypical bathroom gutDemolition Waste Calculator
Calculate debris weight in tons and volume in cubic yards by material type — with disposal cost options and a recycling diversion guide.
~4.2 tons1,200 ft² wood-frame gutTwo good options? See the head-to-head.
The construction vocabulary, decoded.
Every definition links to the calculator that puts the term to work. Browse the full glossary →
Concrete (yd³) = (length ft × width ft × depth ft) / 27Slab volume in cubic yards — what the ready-mix dispatcher asks for. Order 5–10% extra for spillage and uneven subgrade.Cooling BTU ≈ room sq ft × 20–30 (by climate zone)The AC sizing rule of thumb — hotter zones use the higher multiplier, then adjust for sun exposure, ceiling height, and occupants.Board feet = (thickness in × width in × length ft) / 12The lumber-yard pricing unit — one board foot is a 1″ × 12″ × 12″ piece, measured on nominal dimensions.Frequently asked questions
How accurate are these material takeoffs?
Each calculator uses the same waste-factor and overage rules a job-site estimator would apply. The defaults err on the side of slightly over-ordering (because under-ordering costs more in delivery fees and lost time than the extra material). You can adjust the waste factor on every quantity calculator.
Are the engineering calculators (HVAC, structural, electrical) code-compliant?
They use ASHRAE Manual J/D/S (HVAC), NEC current edition (electrical), and IBC/IRC current editions (structural) as the basis. They produce defensible numbers for planning and permit submission, but any project that requires a stamped drawing should be reviewed by a licensed engineer in your jurisdiction.
What's the difference between the Material Estimation guide and the calculators?
The guide explains the unit-of-measure conventions (cubic yards vs bags, board-feet vs linear-feet, squares vs square-feet) and the waste-factor framework. The calculators apply those conventions to your specific dimensions. Read the guide once; bookmark the calculators.
Do these calculators handle metric units?
Most have a unit-toggle in the input panel that switches between US customary (inches, feet, pounds, °F) and metric (cm, m, kg, °C). The structural and electrical calculators expose the underlying conversion factors so you can verify the math.
Why isn't there a permit-cost calculator for my city?
The Permit Fee Calculator handles the most common jurisdictional fee schedules (IBC valuation method, plan-review percentage, plumbing fixture unit fee). For city-specific fees, link your jurisdiction's permit office page from inside the calculator — the inputs are flexible enough to model most local schedules.
11 categories, one search box, zero signups. If it has a number, we calculate it.
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