Conduit Bending
Saddle bends, offsets, kicks, segment bends, rolling offsets, and conduit bend multipliers for field layout.
Electrical Calculators for Motors, Solar, Voltage Drop, and Loads
Find calculators for motors, conduit bends, wire sizing, voltage drop, lighting, solar, backup power, and test readings.
Calculator Categories
Browse calculation families by equipment, field task, and electrical method.
Electrical Formulas
Voltage, current, resistance, power, energy, power factor, and cost calculators for basic electrical math.
Estimating And Material Planning
Material takeoff, conduit cut length, wire pull length, waste allowance, and job quantity calculators.
Lighting And Illumination
Lumens, footcandles, lux, fixture count, lighting load, emergency lighting, and lighting energy calculators.
Load Calculations
Residential, commercial, industrial, feeder, panel, service, appliance, HVAC, and EV load calculators.
Motors And Power Quality
Motor current, starter sizing, VFD checks, transformer kVA, generator load, harmonics, and power quality.
Solar And Backup Power
Battery capacity, runtime, inverter size, UPS capacity, generator load, fuel use, and backup power planning.
Solar And PV Systems
PV array size, solar panel count, string voltage, cable voltage drop, charge controller checks, and solar energy output.
Testing, Protection And Grounding
Insulation resistance, short-circuit current, pull-box sizing, grounding, bonding, touch voltage, and protection checks.
Wire, Cable And Raceway
Wire size, cable resistance, raceway fill, ampacity, voltage drop, bend radius, and pull-length calculators.
Available Calculators
Open a calculator to enter values, inspect the formula, and read the result units.
Residential Electrification Load Scenario Calculator
Compare a defined package of heat-pump, water-heater, induction, dryer, EV, or other electrification changes against entered planning capacity. No equipment database is assumed.
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RC Filter Cutoff Calculator
Calculate the ideal first-order RC corner frequency from resistance and capacitance. The result is circuit arithmetic, not a complete filter, EMC, equipment, or code approval.
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PV String Current Calculator
Separate module operating or short-circuit current from the effect of parallel PV strings, with an explicit adjustment factor and screening limit.
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PV Array Energy Calculator
Calculate PV energy results from a documented yield input supplied by PVWatts, SAM, measured data, or another site-specific resource. This is not a generic peak-sun-hours calculator.
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Power Quality Crest Factor Calculator
Summarize peak-to-RMS waveform behavior before a broader power-quality review.
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Power Dissipation Calculator
Enter voltage, current, and operating hours to calculate ideal electrical power and energy. Treat the result as a screening estimate, not a thermal design approval.
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PLC I/O Load Calculator
Enter repeatable PLC, I/O, communication, and field-device rows with manufacturer-supplied current data. Backplane and field-power budgets remain separate.
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Motor Winding Resistance Imbalance Calculator
Compare three measured motor phase-winding resistances as a preliminary test record before qualified interpretation.
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Motor VFD Cable Length Calculator
Compare the entered VFD-to-motor cable run with the exact drive manual limit and show remaining margin and percentage used. It does not create a universal safe-length rule.
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Motor Synchronous Speed Calculator
Calculate rotating-field speed as a reference for induction-motor slip. The result does not predict loaded rotor speed or select equipment.
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Motor Slip Frequency Calculator
Express motor slip as frequency for a motor or drive review. The result does not diagnose a motor or tune a drive.
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Motor Reflected Inertia Calculator
Combine multiple load-inertia rows before an acceleration, braking, or drive-sizing review.
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Motor Load Percentage Calculator
Review motor loading from measured input power or a documented electrical-power estimate. The calculation does not infer load from current alone.
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Motor Current Unbalance Calculator
Review a recorded three-phase motor current set during maintenance or commissioning. The result does not diagnose the motor or choose a repair.
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Motor Acceleration Time Calculator
Calculate acceleration time from total inertia, starting and ending speed, and average net torque. The result supports a transparent timing review before drive or starter selection.
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Monthly Electricity Bill Calculator
Models a monthly electric bill from kWh, energy rate, demand charge, fixed charge, and taxes while keeping tariff-specific adjustments outside the result.
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Maximum Power Transfer Calculator
Evaluates a known Thevenin source against an entered resistive load and separates matched-load power from efficiency and equipment limits.
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Load Factor Calculator
Converts period energy, period hours, and peak demand into average demand, load factor, and peak-to-average ratio while leaving demand windows and tariff rules outside the result.
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Lighting Power Density Calculator
Reports connected lighting power density from served area and lighting load in both W/sq ft and W/sq m without applying an energy-code limit.
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4-20 mA Instrumentation Loop Power Calculator
Reduces two-wire 4-20 mA loop supply, burden, wiring, and device data into voltage drop, transmitter margin, allowable resistance, and loop power.
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Industrial Connected Load Calculator
Totals industrial equipment rows into connected kW, connected kVA, and line-current estimates from entered power factor, voltage, and phase basis.
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Inductor Series Value Calculator
Combines two or three uncoupled series inductors into an ideal equivalent inductance while leaving coupling, saturation, and rating checks separate.
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Inductor Parallel Value Calculator
Combines two or three uncoupled parallel inductors into an ideal equivalent inductance while leaving current sharing and component ratings separate.
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Generator Fuel Runtime Calculator
Estimates generator fuel burn and runtime from rated output, average load, usable tank volume, and a documented fuel-rate basis.
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