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Mais de 100 calculadoras, estimadores, validadores e conversores inspirados no Reddit para elétrica, mecânica, engenharia civil, fluidos e térmica, materiais, estruturas, hidráulica, segurança, topografia e conversões de engenharia.

107 ferramentas disponíveis

Subcategorias

Voltage Drop Calculator

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

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Wire Size & Ampacity Sizer

Find the conductor and OCPD size for any continuous load.

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Conduit Fill Calculator

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

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Box Fill Calculator

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

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Residential Service Load Calculator

Run a quick NEC 220 standard or optional demand factor.

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Conductor Derating & Correction

Combine adjuster factors for one final ampacity.

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Transformer kVA & Buck-Boost Sizer

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

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Motor FLA & Feeder Sizing (NEC 430)

Compute FLA, feeder ampacity, and OCPD limits.

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Low-Voltage Cable Run Calculator

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

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Room Lighting Lumens Calculator

Estimate fixture count and layout for any space.

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Beam Span & Size Estimator

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

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Spread Footing & Pad Sizer

Estimate a square isolated pad for axial and moment loads.

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Rebar Weight & Length Calculator

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

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Stair Stringer Calculator

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

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Motor Horsepower Converter

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

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Cut/Fill Volume Calculator

Compute net cut and fill volumes with shrink and swell.

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Traverse Closure & Bowditch Adjust

Compute misclosure and adjusted coordinates.

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Horizontal & Vertical Curve Solver

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

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Coordinate Inverse & Forward

Convert between DMS coordinates and azimuth/distance.

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Slope & Grade Calculator

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

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Culvert & Storm Pipe Sizing

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

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Aggregate Tonnage Calculator

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

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Manual J Lite Load Calculator

Estimate room-by-room heating and cooling loads.

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Duct Sizing & CFM by Friction

Size duct runs from CFM and friction rate.

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Refrigerant Target Superheat & Subcool

Get the right superheat or subcool target by gas.

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Furnace & AC BTU Sizing

Match a unit's capacity to the home.

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Drywall Sheets, Mud & Screws Estimator

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

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Paint Coverage & Gallon Estimator

Estimate gallons of paint, primer, and prep.

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Board Feet & Lumber Cost

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

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Linear Feet vs Board Feet Converter

Convert between BF and LF for any nominal size.

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Compound Miter & Crown Angle Calculator

Get miter and bevel for any crown or picture frame.

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Wood Shrinkage & Movement Calculator

Estimate dimensional change across moisture content.

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Stair Stringer Diagram Generator

Visualize the cut layout and printable diagram.

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Mortar Mix Ratio Calculator

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

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Brick & CMU Block Counter

Estimate brick, block, mortar, and grout.

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CMU Grout Volume Calculator

Estimate grout for bonded or unbonded CMU cells.

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Wall Area & Material Estimator

Compute wall SF net of openings.

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Simple Bar-Chart Schedule Builder

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

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Ladder Angle & Pitch Safety Checker

Validate a ladder against OSHA 1910.23.

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Fall Clearance & Anchor Height Calculator

Compute required fall clearance per OSHA.

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Daily Construction Report Builder

Generate a printable site-log from a daily form.

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Bid Markup & Margin Calculator

Compute sell price, gross profit, and tax.

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Labor-Hours Per Task Estimator

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

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OSHA Stair & Guardrail Compliance Checker

Validate stair dimensions and guardrails against OSHA 1910.

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Torque Unit Converter

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

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Pressure / Stress Converter

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

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Flow Rate Converter

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

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Dynamic & Kinematic Viscosity Converter

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

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Thermal Conductivity Converter

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

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Energy Unit Converter (Engineering)

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

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Panel Load & Sub-Panel Sizer

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

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Wire DC Resistance Calculator

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

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Raceway Fill by Trade Size & Wires

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

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Solar PV Wire & String Sizer

Compute conductor ampacity and Voc correction for PV arrays.

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Generator Sizing Calculator

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

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DC Battery Runtime Estimator

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

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Gear Ratio & Output RPM

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

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ASME Shaft Diameter Sizer

Estimate a shaft diameter from torque and material allowable.

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Screw Jack Mechanical Advantage

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

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Two-Pulley RPM & Speed Ratio

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

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Spring Rate (k) Calculator

Size a compression or tension spring from load and deflection.

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Open Channel Flow & Manning Velocity

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

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Catch Basin & Inlet Sizing

Sump and grate capacity check against design Q.

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Riprap & Outlet Protection Sizing

Stabilize a culvert outlet with the right stone size.

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Shrink & Swell Bank-to-Compacted Cubic Yards

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

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Stormwater Detention Volume

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

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True ↔ Magnetic Bearing Converter

Convert true azimuth to magnetic with local declination.

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Pipe Schedule ID/OD Lookup

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

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Boiler Heat Load by EDR

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

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Chilled Water Pipe Sizing

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

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Closed-Loop Expansion Tank Sizing

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

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Natural Gas Pipe Sizing (BTU)

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

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Concrete Bag Count Calculator

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

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Stucco & Plaster Coverage Estimator

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

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Roof Shingle Squares Estimator

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

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Ceiling Tile & Grid Estimator

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

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Fence Material Estimator

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

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AWG ↔ mm² Wire Gauge Converter

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

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Hardness Scale Converter (HRC/HB/HV)

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

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Frequency ↔ Wavelength Converter

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

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Specific Heat Capacity Converter

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

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Floor & Ceiling Joist Span Estimator

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

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Door / Window Header Beam Sizer

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

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Deck Post & Footing Sizer

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

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Euler Column Buckling Load

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

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Shear Wall Line Length & Capacity

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

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Tank Water Heater Sizing by Household

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

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Pipe Flow Velocity & Friction Loss

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

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Floor Drain Trap Primer Frequency

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

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Rainwater Harvesting Tank Sizer

Size a cistern from roof catchment area and local rainfall.

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Restaurant Grease Trap Sizer

Pick a grease trap by fixture count and flow rate.

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Arc Flash Boundary (IEEE 1584)

Compute incident energy and arc flash boundary distance.

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Confined Space Air Monitoring Limits

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

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Lockout / Tagout (LOTO) Procedure Builder

Generate a printable LOTO isolation procedure.

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Noise Dose & TWA Calculator (OSHA / NIOSH)

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

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PPE Category 0–4 Selector (NFPA 70E)

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

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

Convert quadrant bearings to azimuth decimal degrees and back.

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Bowditch / Compass Rule Adjust

Distribute a traverse misclosure by distance.

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UTA / Coordinate Area Calculator

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

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UTM Zone Lookup by Longitude

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

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Resistor Color-Band Decoder

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

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Solar Payback & ROI

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

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Wall Framing Spec Check

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

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BTU / dimensionamento de UPS de sala de servidores

Dimensiona a refrigeração e carga de UPS de uma pequena sala de servidores.

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Dimensionamento de ISO do Windows

Estima o tamanho final de um .iso personalizado.

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Alocador de sub-rede IPv6

Determine o sub-prefixo a partir de uma delegação /N.

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TCO de backup 3-2-1 em nuvem

Estima o custo mensal de um plano 3-2-1 com camada fria.

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