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)

Decode 4-band, 5-band, and 6-band axial resistor color bands into exact resistance value, tolerance, and TCR.

electrical

Three-Phase Electrical Power Calculator

Calculate active power (kW), apparent power (kVA), reactive power (kVAR), and line current for 3-phase circuits.

electrical

Steel Rebar Weight Calculator (D²/162)

Calculate total weight and procurement cost of civil reinforcement steel rebars using diameter and length.

civil-construction

AC Tonnage & Room BTU Calculator

Estimate air conditioner cooling capacity in Tons and BTU/hr based on room dimensions, sunlight, and occupants.

hvac

Dimensional Weight Shipping Calculator (Volumetric)

Calculate dimensional (volumetric) weight and billable shipping weight for FedEx, UPS, DHL, and Air Freight.

logistics

Pipe Flow & Water Velocity Calculator

Calculate fluid velocity in pipes and determine Reynolds laminar or turbulent flow regimes.

fluid-mechanics

Gear & Pulley Speed and Torque Ratio Calculator

Calculate gear transmission ratios, output shaft RPM, and ideal torque amplification.

mechanical

Brick & Tile Flooring Estimator (with Grout & Wastage)

Estimate exact tile counts, brick quantities, and commercial box counts for floors and walls.

construction

Paint Wall Coverage & Can Quantity Calculator

Calculate paint volume in liters and gallons required for walls with doors/windows deducted.

construction

CNC Feeds & Speeds Milling Calculator

Calculate optimal spindle speed (RPM) and cutting feed rate for CNC milling and routing.

machining

3D Printing Filament & Electricity Cost Calculator

Calculate raw filament material cost, printer electricity consumption, and commercial pricing.

fabrication

Rebar & Structural Steel Weight Calculator (D²/162)

Calculate reinforcing steel rebar bar weights using the standard civil engineering D²/162 formula in kg and tons.

construction

HVAC Cooling Load & AC Tonnage Calculator

Estimate required air conditioner cooling capacity in BTU/hr and refrigeration tons based on room dimensions and climate.

hvac

Resistor Color Bands & Tolerance Calculator

Decode 4-band, 5-band, and 6-band resistor color codes to exact Ohms (Ω), tolerance percentage, and temperature PPM.

electronics

Electric Motor Horsepower, Kilowatts & Torque Calculator

Calculate electric motor output power in Horsepower (HP), Kilowatts (kW), full-load rotational RPM, and shaft torque.

electrical

OEE (Overall Equipment Effectiveness) Calculator

Calculate Overall Equipment Effectiveness (OEE) from machine Availability, Performance efficiency, and Quality yield.

manufacturing

Battery Runtime & Inverter UPS Backup Calculator

Calculate backup runtime in hours for home inverters, UPS systems, and battery storage banks based on watt load.

electrical

Off-Grid Solar Battery Bank Sizing Calculator

Size off-grid solar battery banks in Amp-Hours (Ah) and Kilowatt-Hours (kWh) with autonomy days margin.

solar

RC Time Constant & Cutoff Frequency Filter Calculator

Calculate RC circuit time constant (Tau), cutoff frequency (-3dB fc), and capacitor charging/discharging voltage over time.

electronics

Sheet Metal Bend Allowance & Flat Pattern Calculator

Calculate Bend Allowance (BA), Bend Deduction (BD), Setback, and Flat Pattern blank layout for sheet metal press brake forming.

fabrication

Structural Beam Deflection & Bending Stress Calculator

Calculate maximum deflection and bending stress for simply supported and cantilever beams under point and distributed loads.

structural

HVAC Cooling Load & Air Conditioner Tonnage Calculator

Calculate room cooling load in BTU/hr and HVAC air conditioning tonnage sizing based on room dimensions and insulation.

hvac

Pipe Friction Pressure Loss & Head Loss Calculator (Hazen-Williams)

Calculate hydraulic head loss in meters/feet and pressure drop in PSI/bar across pipes using the Hazen-Williams equation.

plumbing

Welding Wire, Electrode & Shielding Gas Consumption Estimator

Estimate MIG wire weight in kg, stick electrode consumption, and shielding gas volume in liters for fabrication joints.

fabrication

SMD Resistor Code Calculator & Decoder (3-Digit, 4-Digit, EIA-96)

Decode surface-mount SMD resistor markings (3-digit, 4-digit, EIA-96, and decimal R notation) into exact Ohms and tolerance.

electronics

Gear Ratio, Speed & Torque Calculator

Calculate gear transmission reduction ratio, driven gear RPM, and torque multiplication from tooth counts.

engineering

Hydraulic Cylinder Force & Speed Calculator

Calculate hydraulic piston extension and retraction force (kN/tons) and operating speed from bore and pressure.

engineering

Brickwork, Masonry & Mortar Quantity Calculator

Calculate required number of bricks, cement bags, and sand volume for masonry walls.

civil-construction

Concrete Mix Ratio & Material Volume Calculator (M15, M20, M25)

Calculate cement bags, sand tons, and coarse aggregate for concrete slabs, columns, and beams.

civil-construction

Flooring & Wall Tile Quantity & Box Calculator

Calculate total floor and wall tiles, boxes needed, and adhesive mortar with wastage.

civil-construction

Wall Paint Coverage & Primer Volume Calculator

Estimate liters of wall paint and primer required based on room dimensions and coats.

civil-construction

Wall Plastering Material & Cement Mortar Calculator

Calculate cement bags and sand volume for internal (12mm) and external (20mm) wall plaster.

civil-construction

Reinforcement Steel Rebar Weight & Length Estimator

Calculate steel rebar weight (kg & tons) from bar diameter (D²/162 formula) and length.

civil-construction

Home Construction & Civil Material Estimation Toolkit

Comprehensive building estimation suite: Calculate bricks, concrete, tiles, paint, plaster, and rebar.

workflows