Construction & DIY
Calculators.
Materials, electrical, roofing, and landscaping — build with confidence, not guesswork. Materials
8 toolsGet exact material quantities before you buy — no waste, no shortages, no surprise trips to the store.
Concrete Calculator
Cubic yards, bags, and ready-mix for slabs, footings, and posts.
Concrete Mix Design Calculator
ACI 211.1 mix design — water-cement ratio, aggregate proportions, and batch quantities by PSI target.
Brick Calculator
Bricks, mortar, and waste factor for any wall layout.
Mulch Calculator
Cubic yards and bags for garden beds and landscapes.
Rebar Calculator
Grid quantities, weight, lap splices, and cost per ACI 318 standards.
Change Order Calculator
Calculate labor, materials, overhead, and profit markup for construction scope changes.
Building Permit Fee Estimator
Estimate permit fees for renovations, new construction, electrical, plumbing, and HVAC projects.
Job Costing Calculator
Track labor, materials, and overhead to calculate total project cost and profit margin.
Outdoor
5 toolsPlan decks, fences, and retaining walls with accurate material lists and cost estimates.
Decking Calculator
Board feet, joists, and hardware for deck builds.
Fence Calculator
Posts, rails, and pickets by linear footage.
Retaining Wall
Block count, gravel base, and drainage for retaining walls.
Roof Calculator
Roofing squares and material for any roof shape.
Shed Calculator
Framing lumber, sheathing, roofing, and total cost estimate for any shed or outbuilding size.
HVAC
7 toolsSize your heating and cooling equipment correctly — oversized units waste energy, undersized ones can't keep up.
AC BTU Calculator
Room-by-room BTU sizing with climate and insulation factors.
Duct Sizing Calculator
ASHRAE equal friction and velocity methods for round and rectangular supply and return ducts — velocity checks and pressure drop for any CFM.
HVAC Load Calculator (Manual J)
Calculate residential heating and cooling loads by climate zone, envelope insulation, windows, and infiltration — with furnace BTU/hr and AC tonnage sizing.
Furnace Sizing Calculator
Size a gas, oil, or electric furnace by BTU/sqft rule-of-thumb — with climate zone multipliers and AFUE efficiency adjustment.
Heat Loss Calculator
BTU/hr heat loss per surface using U-value × area × ΔT — with design temperature lookup and total building heat loss.
Ventilation Rate Calculator
ASHRAE 62.1 & 62.2 — calculate required CFM, air changes per hour, and outdoor air loads for residential and commercial spaces.
Refrigerant Charge Calculator
Total system charge for split ACs and heat pumps by capacity and line set length — with superheat and subcooling targets.
Electrical
14 toolsWire sizing, resistor values, and circuit calculations — get the math right before you wire.
Wire Size Calculator
NEC-compliant wire gauge for safe, efficient circuits.
Ohm's Law
Voltage, current, resistance, and power relationships.
Voltage Divider
Output voltage from two resistors in series.
LED Resistor
Current-limiting resistor for single and series LEDs.
Resistor Color Code
4, 5, and 6-band resistor color code decoder.
Electricity Cost
Monthly and annual energy cost from watts and hours.
Generator Sizing
Calculate backup generator size from your appliance list.
Circuit Breaker Size
NEC-compliant breaker sizing with GFCI/AFCI requirements.
Conduit Fill
Check NEC wire fill percentage for EMT, PVC, and Rigid conduit.
Solar Panel Size
How many panels you need, battery sizing, and 25-year ROI.
EV Charger Sizing
Breaker size, wire gauge, panel load & charging time per NEC 625.
Electrical Panel Load
NEC 220 demand load calculation — service size and capacity analysis.
Ground Fault (GFCI) Calculator
NEC 2020 GFCI and AFCI requirements by room type — outlet count, code sections, and protection cost estimates.
Lighting Layout Calculator
Foot-candle targets, fixture count, and grid spacing by room type — zonal cavity method with efficacy and energy density checks.
Flooring & Walls
4 toolsSquare footage calculations for paint, flooring, wallpaper, and tile — including waste allowance.
Paint Calculator
Gallons needed for walls and ceilings by room dimensions.
Flooring Calculator
Square footage with waste factor for hardwood, laminate, and vinyl.
Wallpaper Calculator
Rolls needed with pattern repeat and window deductions.
Tile Calculator
Tiles, adhesive, and grout for floors and backsplashes.
Roofing
4 toolsRoof area, pitch, shingle bundles, and gutter capacity — everything above the top plate.
Landscaping
5 toolsTopsoil, sod, seed, pavers, and irrigation — plan your outdoor spaces with accurate quantities.
Topsoil Calculator
Cubic yards and delivery cost for garden beds.
Sod Calculator
Rolls, pallets, and cost for instant lawn.
Grass Seed
Pounds per 1,000 sq ft by grass species.
Patio Calculator
Pavers, sand base, and edging for outdoor living.
Irrigation Calculator
Zone flow rates, pipe sizing, and water needs.
Plumbing
7 toolsSize water heaters, calculate flow rates, and plan plumbing systems with engineer-grade accuracy.
Water Heater Size Calculator
First Hour Rating method — find the right tank size, tankless GPM, or heat pump for your household.
Pipe Size Calculator
Hazen-Williams + fixture unit method — size supply and drain pipes for any residential or commercial project.
Water Pressure Calculator
Diagnose home water pressure issues, calculate friction losses, elevation effects, and size PRVs or booster pumps.
Septic Tank Size Calculator
Size your septic tank by bedrooms or flow, calculate leach field area from perc test results, and plan your pumping schedule.
French Drain Calculator
Size perforated pipe drainage systems using Manning's equation and the Rational Method. Full materials BOM included.
Fixture Unit Calculator
Calculate total DFU and WSFU, then size drain stacks and supply mains per IPC/UPC code. Supports all standard fixture types.
Drain Slope Calculator
Calculate drain pipe grade in inches per foot, check IPC/UPC code compliance, and compare flow velocity using Manning's equation.
Structural & Framing
8 toolsSize beams, frame walls, calculate lumber quantities — professional structural calculations without the engineering fees.
Board Foot Calculator
Calculate lumber quantities in board feet with species pricing, grade comparison, and project presets.
Joist Span Calculator
Maximum floor and ceiling joist spans by species, grade, size, and spacing per IRC Table R502.3.1.
Stud & Framing Calculator
Count studs, size headers, and estimate plate lumber for wall framing with doors, windows, and corners per IRC R602.
Structural Beam Sizing Calculator
NDS bending, shear, and deflection checks for sawn lumber, glulam, and LVL beams — pass/fail for any span and load.
Staircase Calculator
Rise, run, stringer length, and angle per IRC R311.7 — with headroom check and full tread/riser count.
Structural Load Calculator
IBC load combinations (LRFD & ASD) — dead, live, snow, wind, and seismic with total factored demand.
Wind Load Calculator
ASCE 7-16 simplified procedure — velocity pressure, design wind pressures by zone, and total base shear for exposure B, C, and D.
Column Load Calculator
Axial capacity, slenderness ratio, LRFD factored load, and utilization ratio for wood, steel, and concrete columns.
Excavation & Aggregate
3 toolsCalculate gravel, crushed stone, and fill material quantities — tons, cubic yards, truck loads, and cost.
Gravel & Aggregate Calculator
Tons and cubic yards for gravel, crushed stone, sand, and fill — with material density, compaction, and truck loads.
Trench Calculator
Excavation volume with trapezoidal cross-section, swell and shrink factors, spoil disposal, and shoring area.
Cut & Fill Calculator
Earthwork balance — bank CY cut and compacted fill with swell and shrink factors for grading projects.
Masonry & Foundation
3 toolsSize footings, calculate concrete volume, and check soil bearing capacity — IRC R403 code references included.
Footing Calculator
Concrete volume, rebar schedule, and soil bearing for strip, spread, and pier footings per IRC R403.
CMU Block Calculator
Blocks, mortar, grout, and rebar with course-by-course schedule and bond beam guide.
Post Hole Calculator
Concrete bags for cylindrical post holes — 60 and 80 lb bags, burial depth, and frost line guidance.
Drywall
4 toolsCalculate drywall sheets, joint compound, tape, and screws — full materials list with GA-214 finish level guide.
Drywall Calculator
Sheets, compound, tape, and screws for any room or project with multi-room support and finish level guide.
Drop Ceiling Calculator
Ceiling tiles, main runners, cross tees, and wall angle for suspended grid ceilings in any room shape.
Soundproofing Calculator
Estimate wall STC rating and noise reduction for common drywall assemblies — resilient channel, MLV, and Green Glue comparisons.
Joint Compound Calculator
Joint compound gallons, tape, and corner bead for any room — with drywall finishing level guide and material cost estimates.
Insulation
5 toolsR-value requirements by IECC climate zone — material quantities, thickness, cost, and energy payback.
Insulation R-Value Calculator
IECC climate zone requirements, bags/rolls needed, thickness, and energy payback for attic, wall, and floor assemblies.
Blown-In Insulation Calculator
Bags of cellulose or fiberglass needed by R-value target — coverage chart, settled depth, and cost comparison.
Spray Foam Calculator
Board-feet of open or closed-cell foam by surface area and thickness — DIY kit vs professional cost comparison.
Vapor Barrier Calculator
Square footage, rolls needed, overlap waste, perm rating, and IRC Table R702.7.1 code compliance by climate zone.
Energy Savings Estimator
Annual savings and payback period for insulation upgrades, window replacements, and air sealing by climate zone and fuel type.
Interior Finishing
4 toolsCarpet, countertops, molding, and trim — precise quantities so you buy once and waste nothing.
Carpet Calculator
Square yards with roll width, seam layout, waste factor, and multi-room support — plus pad and tack strip.
Countertop Calculator
Square footage by section, edge linear feet, and material cost comparison for granite, quartz, laminate, and butcher block.
Crown Molding Calculator
Linear feet, piece count, miter angles, and waste factor for room perimeter crown molding installation.
Baseboard & Trim Calculator
Perimeter linear feet with door, window, and corner deductions — piece count, waste, and cost estimate.
Windows & Doors
5 toolsEnergy performance and rough opening sizing — get windows and doors right before framing.
Window Energy Calculator
Annual heat loss through windows using U-value × area × HDD — with U-factor and SHGC comparison by climate zone.
Window U-Factor Comparison Calculator
Compare current vs replacement window U-factors — calculate heat loss reduction, annual savings, payback period, and ENERGY STAR qualification.
Door Rough Opening Calculator
Rough opening width and height for any door size — header size by span and load type per IRC R602.7.
Door Sizing Calculator
Rough opening, header size, ADA clearances, and framing materials for any door type — interior, exterior, French, sliding, and garage.
Weatherstripping Calculator
Weatherstrip length, air leakage reduction, and energy savings for doors and windows — by gap size and strip type.
Pool & Water Features
4 toolsVolume, liner sizing, and chemical starting points for pools, ponds, and water features.
Pool Volume Calculator
Gallons for rectangular, oval, round, and kidney pools — with pump turnover time and chemical starting doses.
Pool Chemical Dosing Calculator
Exact doses for chlorine, pH, alkalinity, CYA, and calcium hardness — with Langelier Saturation Index water balance.
Pond Liner Calculator
EPDM or PVC liner dimensions using length/width + 2×depth + 2×overlap — with volume, pump size, and cost.
Pool Pump Sizing Calculator
Required GPM, total dynamic head, recommended HP, and operating costs — single-speed vs variable-speed pump comparison.
Demolition
2 toolsEstimate debris volume, weight, and disposal costs before the sledgehammer swings.