Engineering & Construction
34 In-Browser ToolsOhm's law, wire voltage drop, concrete mix volume, steel rebar weight, AC tonnage, and gear ratios. Zero cloud uploads — runs locally on your machine in volatile memory.
Engineering & Construction
Ohm's law, wire voltage drop, concrete mix volume, steel rebar weight, AC tonnage, and gear ratios.
Resistor Color Code Calculator (4, 5 & 6 Band)
electricalDecode 4-band, 5-band, and 6-band axial resistor color bands into exact resistance value, tolerance, and TCR.
Three-Phase Electrical Power Calculator
electricalCalculate active power (kW), apparent power (kVA), reactive power (kVAR), and line current for 3-phase circuits.
Steel Rebar Weight Calculator (D²/162)
civil-constructionCalculate total weight and procurement cost of civil reinforcement steel rebars using diameter and length.
AC Tonnage & Room BTU Calculator
hvacEstimate air conditioner cooling capacity in Tons and BTU/hr based on room dimensions, sunlight, and occupants.
Dimensional Weight Shipping Calculator (Volumetric)
logisticsCalculate dimensional (volumetric) weight and billable shipping weight for FedEx, UPS, DHL, and Air Freight.
Pipe Flow & Water Velocity Calculator
fluid-mechanicsCalculate fluid velocity in pipes and determine Reynolds laminar or turbulent flow regimes.
Gear & Pulley Speed and Torque Ratio Calculator
mechanicalCalculate gear transmission ratios, output shaft RPM, and ideal torque amplification.
Brick & Tile Flooring Estimator (with Grout & Wastage)
constructionEstimate exact tile counts, brick quantities, and commercial box counts for floors and walls.
Paint Wall Coverage & Can Quantity Calculator
constructionCalculate paint volume in liters and gallons required for walls with doors/windows deducted.
CNC Feeds & Speeds Milling Calculator
machiningCalculate optimal spindle speed (RPM) and cutting feed rate for CNC milling and routing.
3D Printing Filament & Electricity Cost Calculator
fabricationCalculate raw filament material cost, printer electricity consumption, and commercial pricing.
Rebar & Structural Steel Weight Calculator (D²/162)
constructionCalculate reinforcing steel rebar bar weights using the standard civil engineering D²/162 formula in kg and tons.
HVAC Cooling Load & AC Tonnage Calculator
hvacEstimate required air conditioner cooling capacity in BTU/hr and refrigeration tons based on room dimensions and climate.
Resistor Color Bands & Tolerance Calculator
electronicsDecode 4-band, 5-band, and 6-band resistor color codes to exact Ohms (Ω), tolerance percentage, and temperature PPM.
Electric Motor Horsepower, Kilowatts & Torque Calculator
electricalCalculate electric motor output power in Horsepower (HP), Kilowatts (kW), full-load rotational RPM, and shaft torque.
OEE (Overall Equipment Effectiveness) Calculator
manufacturingCalculate Overall Equipment Effectiveness (OEE) from machine Availability, Performance efficiency, and Quality yield.
Battery Runtime & Inverter UPS Backup Calculator
electricalCalculate backup runtime in hours for home inverters, UPS systems, and battery storage banks based on watt load.
Off-Grid Solar Battery Bank Sizing Calculator
solarSize off-grid solar battery banks in Amp-Hours (Ah) and Kilowatt-Hours (kWh) with autonomy days margin.
RC Time Constant & Cutoff Frequency Filter Calculator
electronicsCalculate RC circuit time constant (Tau), cutoff frequency (-3dB fc), and capacitor charging/discharging voltage over time.
Sheet Metal Bend Allowance & Flat Pattern Calculator
fabricationCalculate Bend Allowance (BA), Bend Deduction (BD), Setback, and Flat Pattern blank layout for sheet metal press brake forming.
Structural Beam Deflection & Bending Stress Calculator
structuralCalculate maximum deflection and bending stress for simply supported and cantilever beams under point and distributed loads.
HVAC Cooling Load & Air Conditioner Tonnage Calculator
hvacCalculate room cooling load in BTU/hr and HVAC air conditioning tonnage sizing based on room dimensions and insulation.
Pipe Friction Pressure Loss & Head Loss Calculator (Hazen-Williams)
plumbingCalculate hydraulic head loss in meters/feet and pressure drop in PSI/bar across pipes using the Hazen-Williams equation.
Welding Wire, Electrode & Shielding Gas Consumption Estimator
fabricationEstimate MIG wire weight in kg, stick electrode consumption, and shielding gas volume in liters for fabrication joints.
SMD Resistor Code Calculator & Decoder (3-Digit, 4-Digit, EIA-96)
electronicsDecode surface-mount SMD resistor markings (3-digit, 4-digit, EIA-96, and decimal R notation) into exact Ohms and tolerance.
Gear Ratio, Speed & Torque Calculator
Calculate gear transmission reduction ratio, driven gear RPM, and torque multiplication from tooth counts.
Hydraulic Cylinder Force & Speed Calculator
Calculate hydraulic piston extension and retraction force (kN/tons) and operating speed from bore and pressure.
Brickwork, Masonry & Mortar Quantity Calculator
civil-constructionCalculate required number of bricks, cement bags, and sand volume for masonry walls.
Concrete Mix Ratio & Material Volume Calculator (M15, M20, M25)
civil-constructionCalculate cement bags, sand tons, and coarse aggregate for concrete slabs, columns, and beams.
Flooring & Wall Tile Quantity & Box Calculator
civil-constructionCalculate total floor and wall tiles, boxes needed, and adhesive mortar with wastage.
Wall Paint Coverage & Primer Volume Calculator
civil-constructionEstimate liters of wall paint and primer required based on room dimensions and coats.
Wall Plastering Material & Cement Mortar Calculator
civil-constructionCalculate cement bags and sand volume for internal (12mm) and external (20mm) wall plaster.
Reinforcement Steel Rebar Weight & Length Estimator
civil-constructionCalculate steel rebar weight (kg & tons) from bar diameter (D²/162 formula) and length.
Home Construction & Civil Material Estimation Toolkit
workflowsComprehensive building estimation suite: Calculate bricks, concrete, tiles, paint, plaster, and rebar.