El dimensionamiento BTU varía mucho según la latitud — elige tu zona y el tamaño de la habitación para obtener el objetivo real de calefacción/refrigeración.

Insignia · Dimensionamiento por clima

HVAC BTU by Climate Zone

Cinco zonas climáticas de EE. UU. se corresponden con multiplicadores BTU por pie cuadrado. Elige la tuya, arrastra el área de la habitación y obtén el objetivo exacto.

Area 400 ft²

14,400 BTUZone 3 · Central · 36 BTU/ft² × 400 ft² Abrir calculadora completa

Heating output

Furnace Sizing

Right-size BTU output by climate, square footage, and insulation level.

~64k BTU2000 ft² · Zone 4

Más herramientas HVAC 5 más

Heat LoadManual J Duct SizeCFM lookup Refrigerant Chargelb subcool R-Valueinsulation Energy SavingskWh/yr Heat Lossheat gain Ventilation Rateashrae 62.1 Blown-In Insulationcellulose insulation Spray Foam Insulationopen cell Vapor Barriervapor retarder AC Tonnageair conditioner size Air Changes Per Hourach Boiler Sizeboiler btu Heat Pump vs Gas Furnace Operating Costheat pump savings Mini-Split Sizingmini split sizing Radiant Floor Heatingpex tubing length

Guided journeys

Bigger 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.

Guided journey · 5 steps

Home Renovation Journey

Budget PlannerConcretePaintAC BTUElectricity Cost ~10 minStart journey →

Structural · 32 tools

Size it right before you build.

Beams, columns, joists, stairs, and framing — engineering numbers from IRC/IBC tables before the inspector arrives.

16″ on-center

The standard stud and joist spacing the framing tools default to, straight from IRC tables.

IRC R311.7 compliance

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 steps

Wall framing

Stud & 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.

More structural tools 30 more

Beam SizingNDS bending Joist SpanIRC Table Structural LoadIBC combos Wind LoadASCE 7 Column Loadwood/steel/concrete Board Footlumber order Door Rough Openingrough opening size Door Sizingrough opening Weatherstrippingdoor seal Window Energywindow u-value Window U-Factorwindow energy ADA Rampwheelchair ramp slope Aluminum Weightaluminum density Angle Iron Weightl-shape steel weight Copper Weightcopper density Deck Load Capacitydeck live load psf Elevation Gradeslope percentage Flat Bar Weightbar stock weight Log Weightgreen wood density Lumber Weightboard foot weight Metal Weightsteel weight Miter Angle Cutcompound miter Pipe Weighttube weight Sheet Metal Weightgauge to thickness Snow Loadcalculate roof snow Spiral Staircasespiral stair treads Steel Plate Weightsteel plate lb/sqft Steel Weightsteel density Stone Weightstone density Vertical Curvecrest curve

Exteriores · 5 herramientas

Terrazas, patios, cercas — construidas a especificación.

Planifica el conteo de tablas, la distribución de postes y las bolsas de mezcla para proyectos al aire libre.

Deck materials

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.

Boundary

Fence Calculator

Post count + rail length + picket spacing — by run length and style.

18 posts150 ft · 8 ft o.c.

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Patio Paversunit count Muro de Contencióncapas de bloques Pool Volumegallons Basic Roofingshingles Fencepicket Shedoutbuilding Pond Linerpond volume Pool Chemical Dosingpool chlorine Pool Pump Sizingpool pump gpm Pavercalculate how many

Electricidad · 14 herramientas

Cabléalo bien a la primera.

Dimensionamiento de cables, caída de tensión, llenado de conductos y carga del panel — las matemáticas del NEC que mantienen a los inspectores satisfechos.

Flagship · NEC sizing

Wire Size Calculator

Pick amperage and distance — get the minimum AWG that meets the 3% voltage-drop rule.

Amperage 20A

Distance 50 ft

#10 AWGcopper · 2.1% drop · upsized for VD Open full calculator

NEC 210.8

Ground Fault (GFCI)

Where GFCI/AFCI protection is required and the trip-current thresholds by location.

5 mAClass A GFCI trip

Más herramientas eléctricas 12 más

Llenado de ConductoNEC cap. 9 Carga del Panelamperios usados Breaker Size125% rule Cargador EVamp L1/L2 Ohm's LawV=IR Resistor Codecolor bands Divisor de TensiónVout Solar SystemkW need GeneradorkW de respaldo Electricity Costenergy LED Resistorelectronics Lighting Layoutrecessed lighting Voltage Dropwire gauge Watts to Ampsamps to watts Electrical Service Upgrade100 amp vs 200 amp

Techos · 4 herramientas

Paquetes, squares y pendiente.

Paquetes de tejas, dimensionamiento de canaletas y conversiones de pendiente para cualquier línea de techo.

Flagship · Pitch-aware

Shingles Calculator

Set the roof area and pitch — waste factor adjusts automatically for steep slopes.

Roof Area 2,000 ft²

7120.0 sq · 17% pitch waste Open full calculator

Drainage

Gutter Size

Match gutter capacity to roof area + rainfall intensity.

6" K-style1800 ft² · 5"/hr

Más herramientas de techos 2 más

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Plomería · 7 herramientas

Tamaño de tubería, pendiente de drenaje, carga séptica.

Dimensionar bien la tubería desde el inicio evita excavar dos veces.

Pipe sizing

Pipe Size Calculator

Sizing for water supply and DWV — by fixture units and run length.

¾" copper6 fixtures · 50 ft

Onsite

Septic Tank Size

Tank size by bedroom count + flow rate (state code-tested ranges).

1,500 gal4 BR · standard

Más herramientas de plomería 5 más

Pendiente de Drenaje¼"/ft Water Heatergallons French Draingravel ft³ Fixture UnitsDFU load Water PressurePSI / GPM Fire Flowfire hydrant flow GPM Flow Ratepipe flow gpm Rolling Offsetpipe offset Sump Pump Sizingsump pump size Water Softener Sizingwater softener size

Paisajismo · 5 herramientas

Césped, arriates e irrigación.

Insignia · Cobertura de terreno

Sod Calculator

Ingresa el área de tu jardín — el conteo de pallets, el total en yardas cuadradas y el costo estimado según el precio local aparecen al instante.

Area 2,000 ft²

$/pallet $150

5 pallets~222 yds² · $750 est. Abrir calculadora completa

Seed coverage

Grass Seed

Pounds of seed by lawn area and grass type — new-lawn vs overseed rates.

~16 lb2,000 ft² · new lawn

Más herramientas de paisajismo 3 más

Irrigaciónzonas Patio Paversunit count Topsoilcu yd fill Artificial Turf Costturf infill

Pisos y Paredes · 4 herramientas

Azulejos, tablones, pintura — matemáticas de metros cuadrados.

Insignia · Cobertura de pintura

Paint Calculator

Ingresa las dimensiones del cuarto — galones y costo como resultado: cuenta paredes, considera las capas y asume una cobertura de 350 ft²/galón.

Length 14 ft

Width 12 ft

Coats 2 coats

3 gal468 ft² walls · 2 coats Abrir calculadora completa

Box math

Tile Calculator

Box count from total area, tile size, and waste factor.

~3 boxes200 ft² · 12"×12" · 10% waste

Más herramientas de pisos y paredes 2 más

Laminate Flooringplanks Papel Tapizrollos Drop Ceilingsuspended ceiling Drywallsheetrock Joint Compounddrywall mud Soundproofingstc rating Baseboard & Trimbaseboard linear feet Carpetflooring Countertopcounter square feet Crown Moldingmolding cost Epoxy Garage Floorepoxy floor Grout Coveragetile joint width Thinset Mortartrowel size coverage Baluster Spacing4 inch sphere rule Board and Battenbatten spacing Closet Shelvingcloset rod linear feet Shiplapboard coverage width Trim Miter Anglemiter saw angle Wainscotingrail and stile

Demolition · 2 tools

Debris, 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 sizing

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 gut

Waste estimate

Demolition 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 gut

Metalworking · 14 tools

Shop-floor machining and layout math.

Speeds, feeds, thread specs, and bolt-pattern layout for the drill press, mill, and lathe — starting with converting a material's cutting speed into the RPM you actually dial in.

Speeds & feeds

Spindle Speed Calculator

Convert surface footage (SFM or SMM) and tool/workpiece diameter into the spindle RPM to dial in on a drill press, mill, or lathe.

344 RPM1" HSS drill · mild steel · 90 SFM

Speeds & feeds

Feed Rate Calculator

Machining feed rate (IPM) from spindle RPM, feed per tooth (chip load), and flute count, with a chip-load reference table.

18 IPM3,000 RPM · 0.003" IPT · 2 flutes

Layout

Bolt Circle Layout Calculator

The X/Y coordinates of evenly spaced bolt holes on a bolt circle (BCD) from the number of holes, diameter, and starting angle.

6 holes6 in BCD · 60° apart

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Thread Sizetap drill chart Thread Pitchtpi to mm Tap Drill Sizethread engagement Punch Forcepress tonnage Material Removal RateMRR Pitch Diameterthread & gear PD Bend Allowanceflat pattern Bend Deductionmold line Countersink Depthcsk depth K-Factor Calculator (Sheet Metal)k factor True Positionpositional tolerance

Decide between

Two good options? See the head-to-head.

Tankless water heaterVSTraditional tank

Key terms & formulas

The construction vocabulary, decoded.

Every definition links to the calculator that puts the term to work. Browse the full glossary →

Cubic YardThe standard ordering unit for ready-mix concrete. One cubic yard equals 27 cubic feet and weighs approximately 4,050 lbs. PSI RatingThe compressive strength of cured concrete in pounds per square inch. Residential slabs typically use 3,000–4,000 PSI concrete. BTU (British Thermal Unit)Heat quantity used in cooling capacity. In AC sizing, BTU/hr shows how fast a unit can remove heat from a room. SEER (Seasonal Energy Efficiency Ratio)Seasonal cooling output divided by seasonal energy use. It better reflects annual efficiency than fixed-condition EER. AmpacityThe maximum current a wire can safely carry without overheating, determined by insulation type, ambient temperature, and the number of conductors in a conduit. Voltage DropThe loss of voltage along a wire due to its inherent resistance over a given length. Excessive voltage drop causes dim lights, slow motors, and wasted energy. NECNational Electrical Code — the U.S. standard governing wire sizing, overcurrent protection, and all electrical installation practices in residential and commercial buildings. Roofing SquareA unit of measurement equal to 100 sq ft of roof surface. All shingle quantities are expressed in squares. Waste FactorThe percentage added to account for cuts, trim, and starter course consumption, ranging from 10% for a simple gable to 25% for a complex multi-valley roof. Board Foot (BF)A unit of lumber volume equal to a piece 1 inch thick, 12 inches wide, and 12 inches long — that is 144 cubic inches. It is the standard pricing unit for dimensional and hardwood lumber in the United. Drain Fixture Unit (DFU)A dimensionless value assigned to each plumbing drain fixture that represents its wastewater flow contribution. IPC Table 703.2 converts total DFU counts to minimum drain pipe diameters. Pallet CoverageA standard sod pallet holds approximately 50 rolls, covering about 450 sq ft total. Coverage varies by supplier and roll size, so always confirm the exact sq ft per pallet before placing your order.

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.

Preguntas frecuentes

¿Qué precisión tienen estos cálculos de materiales?

Cada calculadora usa los mismos factores de desperdicio y márgenes de seguridad que aplicaría un estimador en obra. Los valores predeterminados tienden a pedir un poco más de material (porque pedir de menos cuesta más en fletes adicionales y tiempo perdido que el material sobrante). Puedes ajustar el factor de desperdicio en cada calculadora de cantidades.

¿Las calculadoras de ingeniería (HVAC, estructural, eléctrica) cumplen con las normativas?

Se basan en el Manual J/D/S de ASHRAE (HVAC), la edición vigente del NEC (eléctrica) y las ediciones vigentes del IBC/IRC (estructural). Producen cifras defendibles para la planificación y la presentación de permisos, pero cualquier proyecto que requiera planos sellados debe ser revisado por un ingeniero con licencia en tu jurisdicción.

¿Cuál es la diferencia entre la guía de Estimación de Materiales y las calculadoras?

La guía explica las convenciones de unidades de medida (yardas cúbicas vs bolsas, pies de tablón vs pies lineales, squares vs pies cuadrados) y el marco de factores de desperdicio. Las calculadoras aplican esas convenciones a tus dimensiones específicas. Lee la guía una vez; guarda las calculadoras en favoritos.

¿Estas calculadoras manejan unidades métricas?

La mayoría tiene un selector de unidades en el panel de entrada que alterna entre el sistema consuetudinario de EE. UU. (pulgadas, pies, libras, °F) y el métrico (cm, m, kg, °C). Las calculadoras estructurales y eléctricas muestran los factores de conversión subyacentes para que puedas verificar las matemáticas.

¿Por qué no hay una calculadora de costos de permiso para mi ciudad?

La Calculadora de Tarifas de Permiso maneja los calendarios de tarifas jurisdiccionales más comunes (método de valuación del IBC, porcentaje de revisión de planos, tarifa por unidad de artefacto de plomería). Para las tarifas específicas de tu ciudad, enlaza la página de la oficina de permisos de tu jurisdicción desde dentro de la calculadora — las entradas son lo suficientemente flexibles para modelar la mayoría de los calendarios locales.

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15 categorías, un buscador, cero registros. Si tiene un número, lo calculamos.

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