Sugerir herramienta

Dinos qué herramienta te gustaría ver. Construimos una por semana a partir de peticiones reales.

Construye con cabeza.

Ingeniería

Más de 100 calculadoras, estimadores, validadores y conversores inspirados en Reddit para electricidad, mecánica, ingeniería civil, fluidos y térmica, materiales, estructuras, fontanería, seguridad, topografía y conversiones de ingeniería.

107 herramientas disponibles

Subcategorías

Voltage Drop Calculator

Compute the percentage drop across a feeder or branch circuit quickly.

Abrir herramienta

Wire Size & Ampacity Sizer

Find the conductor and OCPD size for any continuous load.

Abrir herramienta

Conduit Fill Calculator

Validate raceway fill against the 40% rule and Chapter 9 tables.

Abrir herramienta

Box Fill Calculator

Size a box to meet NEC 314.16 volume and claw counts.

Abrir herramienta

Residential Service Load Calculator

Run a quick NEC 220 standard or optional demand factor.

Abrir herramienta

Conductor Derating & Correction

Combine adjuster factors for one final ampacity.

Abrir herramienta

Transformer kVA & Buck-Boost Sizer

Pick the right kVA, tap, and configuration for a transformer job.

Abrir herramienta

Motor FLA & Feeder Sizing (NEC 430)

Compute FLA, feeder ampacity, and OCPD limits.

Abrir herramienta

Low-Voltage Cable Run Calculator

Estimate end-of-run voltage, signal loss, and gauge upgrades.

Abrir herramienta

Room Lighting Lumens Calculator

Estimate fixture count and layout for any space.

Abrir herramienta

Beam Span & Size Estimator

Quick-check a wood, LVL, or W-shape against deflection.

Abrir herramienta

Spread Footing & Pad Sizer

Estimate a square isolated pad for axial and moment loads.

Abrir herramienta

Rebar Weight & Length Calculator

Convert bar size, length, and lap into pounds and tons.

Abrir herramienta

Stair Stringer Calculator

Lay out rise, run, and stringer length to code.

Abrir herramienta

Motor Horsepower Converter

Convert between mechanical, metric, BTU, and electrical HP.

Abrir herramienta

Cut/Fill Volume Calculator

Compute net cut and fill volumes with shrink and swell.

Abrir herramienta

Traverse Closure & Bowditch Adjust

Compute misclosure and adjusted coordinates.

Abrir herramienta

Horizontal & Vertical Curve Solver

Solve PC, PT, and station offsets for any curve.

Abrir herramienta

Coordinate Inverse & Forward

Convert between DMS coordinates and azimuth/distance.

Abrir herramienta

Slope & Grade Calculator

Express slope in pitch, percent, ratio, and angle.

Abrir herramienta

Culvert & Storm Pipe Sizing

Compute design Q and pipe diameter with Manning's equation.

Abrir herramienta

Aggregate Tonnage Calculator

Compute cubic yards, tons, and bag counts for any job.

Abrir herramienta

Manual J Lite Load Calculator

Estimate room-by-room heating and cooling loads.

Abrir herramienta

Duct Sizing & CFM by Friction

Size duct runs from CFM and friction rate.

Abrir herramienta

Refrigerant Target Superheat & Subcool

Get the right superheat or subcool target by gas.

Abrir herramienta

Furnace & AC BTU Sizing

Match a unit's capacity to the home.

Abrir herramienta

Drywall Sheets, Mud & Screws Estimator

Compute drywall sheets, joint compound, tape, and screws.

Abrir herramienta

Paint Coverage & Gallon Estimator

Estimate gallons of paint, primer, and prep.

Abrir herramienta

Board Feet & Lumber Cost

Compute board feet, cost, and fall-off vs. vendor counts.

Abrir herramienta

Linear Feet vs Board Feet Converter

Convert between BF and LF for any nominal size.

Abrir herramienta

Compound Miter & Crown Angle Calculator

Get miter and bevel for any crown or picture frame.

Abrir herramienta

Wood Shrinkage & Movement Calculator

Estimate dimensional change across moisture content.

Abrir herramienta

Stair Stringer Diagram Generator

Visualize the cut layout and printable diagram.

Abrir herramienta

Mortar Mix Ratio Calculator

Get Portland, lime, and sand batched by mix type.

Abrir herramienta

Brick & CMU Block Counter

Estimate brick, block, mortar, and grout.

Abrir herramienta

CMU Grout Volume Calculator

Estimate grout for bonded or unbonded CMU cells.

Abrir herramienta

Wall Area & Material Estimator

Compute wall SF net of openings.

Abrir herramienta

Simple Bar-Chart Schedule Builder

Lay out a small job's milestone Gantt without MS Project.

Abrir herramienta

Ladder Angle & Pitch Safety Checker

Validate a ladder against OSHA 1910.23.

Abrir herramienta

Fall Clearance & Anchor Height Calculator

Compute required fall clearance per OSHA.

Abrir herramienta

Daily Construction Report Builder

Generate a printable site-log from a daily form.

Abrir herramienta

Bid Markup & Margin Calculator

Compute sell price, gross profit, and tax.

Abrir herramienta

Labor-Hours Per Task Estimator

Estimate crew days, man-hours, and labor cost.

Abrir herramienta

OSHA Stair & Guardrail Compliance Checker

Validate stair dimensions and guardrails against OSHA 1910.

Abrir herramienta

Torque Unit Converter

Switch between Nm, lb-ft, kgf-m, and oz-in.

Abrir herramienta

Pressure / Stress Converter

Translate Pa, MPa, psi, ksi, bar, and atm.

Abrir herramienta

Flow Rate Converter

Switch between CFM, m3/s, GPM, and L/min.

Abrir herramienta

Dynamic & Kinematic Viscosity Converter

Convert cP, mPa-s, cSt, and mm2/s.

Abrir herramienta

Thermal Conductivity Converter

Translate W/(m K), BTU/(h ft F), and W/(m C).

Abrir herramienta

Energy Unit Converter (Engineering)

Convert J, kJ, kWh, BTU, therm, and ft-lb.

Abrir herramienta

Panel Load & Sub-Panel Sizer

Tally a panel's connected load and pick the next standard bus rating.

Abrir herramienta

Wire DC Resistance Calculator

Compute the ohms and percent drop for any gauge length and material.

Abrir herramienta

Raceway Fill by Trade Size & Wires

Size EMT, PVC, and flex by actual cable area and Chapter 9 tables.

Abrir herramienta

Solar PV Wire & String Sizer

Compute conductor ampacity and Voc correction for PV arrays.

Abrir herramienta

Generator Sizing Calculator

Pick the right standby or jobsite kW for any load list.

Abrir herramienta

DC Battery Runtime Estimator

Estimate runtime, depth-of-discharge, and battery bank size.

Abrir herramienta

Gear Ratio & Output RPM

Compute gear train ratios, output RPM, and torque multiplication.

Abrir herramienta

ASME Shaft Diameter Sizer

Estimate a shaft diameter from torque and material allowable.

Abrir herramienta

Screw Jack Mechanical Advantage

MA, velocity ratio, and efficiency for a screw jack.

Abrir herramienta

Two-Pulley RPM & Speed Ratio

Match driver to driven pulley by RPM, diameter, and belt length.

Abrir herramienta

Spring Rate (k) Calculator

Size a compression or tension spring from load and deflection.

Abrir herramienta

Open Channel Flow & Manning Velocity

Compute uniform flow for a ditch, swale, or channel cross-section.

Abrir herramienta

Catch Basin & Inlet Sizing

Sump and grate capacity check against design Q.

Abrir herramienta

Riprap & Outlet Protection Sizing

Stabilize a culvert outlet with the right stone size.

Abrir herramienta

Shrink & Swell Bank-to-Compacted Cubic Yards

Convert bank yards to compacted or loose yards using shrink/swell factors.

Abrir herramienta

Stormwater Detention Volume

Size a detention basin for pre- vs. post-development runoff.

Abrir herramienta

True ↔ Magnetic Bearing Converter

Convert true azimuth to magnetic with local declination.

Abrir herramienta

Pipe Schedule ID/OD Lookup

Find inside diameter, wall thickness, and weight per foot for any schedule.

Abrir herramienta

Boiler Heat Load by EDR

Convert EDR (sq ft) into MBH for steam or hot-water boilers.

Abrir herramienta

Chilled Water Pipe Sizing

Pick a chilled water pipe by GPM and ΔT with velocity caps.

Abrir herramienta

Closed-Loop Expansion Tank Sizing

Pick a diaphragm expansion tank for a hydronic or hot-water loop.

Abrir herramienta

Natural Gas Pipe Sizing (BTU)

Match gas pipe length and BTU load to the right nominal size.

Abrir herramienta

Concrete Bag Count Calculator

Count 60-lb, 80-lb, or bag-calculator-ready mixes for any pour.

Abrir herramienta

Stucco & Plaster Coverage Estimator

Coverage, bags, and labor for scratch, brown, and finish coats.

Abrir herramienta

Roof Shingle Squares Estimator

Count shingle squares, starter, ridge cap, and felt underlayment.

Abrir herramienta

Ceiling Tile & Grid Estimator

Count 2x2 / 2x4 tiles, grid mains, tees, and wire.

Abrir herramienta

Fence Material Estimator

Posts, rails, pickets, concrete, and gates for any fence run.

Abrir herramienta

AWG ↔ mm² Wire Gauge Converter

Convert AWG / kcmil to metric mm² cross-section and diameter.

Abrir herramienta

Hardness Scale Converter (HRC/HB/HV)

Approximate cross-scale conversions between Rockwell, Brinell, and Vickers.

Abrir herramienta

Frequency ↔ Wavelength Converter

Convert Hz to wavelength in vacuum, air, or with speed-of-sound.

Abrir herramienta

Specific Heat Capacity Converter

Convert J/(kg·K), BTU/(lb·°F), and cal/(g·°C).

Abrir herramienta

Floor & Ceiling Joist Span Estimator

Quick-check a wood joist or TJI against span tables.

Abrir herramienta

Door / Window Header Beam Sizer

Estimate a header for a door or window opening in a bearing wall.

Abrir herramienta

Deck Post & Footing Sizer

Sizing for deck posts, footings, and beam spans per IRC.

Abrir herramienta

Euler Column Buckling Load

Compute critical buckling load for a fixed/pinned steel or wood column.

Abrir herramienta

Shear Wall Line Length & Capacity

Estimate required shear wall length for a given wind or seismic story shear.

Abrir herramienta

Tank Water Heater Sizing by Household

Pick a tank size (gal) for a family of 1–6.

Abrir herramienta

Pipe Flow Velocity & Friction Loss

Solve velocity and Hazen-Williams head loss for any diameter.

Abrir herramienta

Floor Drain Trap Primer Frequency

Compute primer valve cycles/day to keep P-traps wet.

Abrir herramienta

Rainwater Harvesting Tank Sizer

Size a cistern from roof catchment area and local rainfall.

Abrir herramienta

Restaurant Grease Trap Sizer

Pick a grease trap by fixture count and flow rate.

Abrir herramienta

Arc Flash Boundary (IEEE 1584)

Compute incident energy and arc flash boundary distance.

Abrir herramienta

Confined Space Air Monitoring Limits

O2, LEL, CO, and H2S atmospheric alarm criteria.

Abrir herramienta

Lockout / Tagout (LOTO) Procedure Builder

Generate a printable LOTO isolation procedure.

Abrir herramienta

Noise Dose & TWA Calculator (OSHA / NIOSH)

Compute 8-hour time-weighted average and % dose.

Abrir herramienta

PPE Category 0–4 Selector (NFPA 70E)

Pick the NFPA 70E PPE category for any arc flash task.

Abrir herramienta

Bearing (NE/NW/SE/SW) ↔ Azimuth Converter

Convert quadrant bearings to azimuth decimal degrees and back.

Abrir herramienta

Bowditch / Compass Rule Adjust

Distribute a traverse misclosure by distance.

Abrir herramienta

UTA / Coordinate Area Calculator

Compute planar area of an ordered lat/lon or N/E polygon.

Abrir herramienta

UTM Zone Lookup by Longitude

Find the UTM zone, central meridian, and convergence for any longitude.

Abrir herramienta

Resistor Color-Band Decoder

Read a 4-band or 5-band resistor color code into ohms, with tolerance and ppm/K.

Abrir herramienta

Solar Payback & ROI

Estimate the payback period, lifetime savings, and IRR of a rooftop solar install.

Abrir herramienta

Wall Framing Spec Check

Validate a stud-and-plate wall against common code spans.

Abrir herramienta

BTU / dimensionado de UPS para sala de servidores

Dimensiona la refrigeración y carga de UPS de un pequeño cuarto de servidores.

Abrir herramienta

Dimensionado de Windows ISO / WIM

Estima el tamaño final de un .iso personalizado.

Abrir herramienta

Asignador de subred IPv6

Determina el prefijo de subred a partir de una delegación /N.

Abrir herramienta

TCO de copia de seguridad 3-2-1 en la nube

Estima el coste mensual de un plan 3-2-1 con nivel frío.

Abrir herramienta

Explorar otra categoría