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.
Cable Tray Material Takeoff Calculator
Converts entered cable-tray route rows, stock lengths, fittings, splices, covers, partitions, supports, and allowances into a planning takeoff.
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Cable Reel Capacity Calculator
Estimates cable length, remaining reel capacity, and winding layers from reel geometry, cable outside diameter, packing factor, and existing cable length.
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Cable Pulling Lubricant Quantity Calculator
Estimates cable surface area and lubricant quantity for a planned raceway pull from route geometry, cable count, product coverage, and waste allowance.
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Battery Charge Time Calculator
Estimates battery charging time from nominal capacity, starting state of charge, effective charge current, and charging efficiency.
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Battery Bank Series Parallel Calculator
Models nominal battery-bank voltage, amp-hour capacity, and stored energy from identical batteries arranged in series and parallel.
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Admittance Calculator
Resolves complex admittance magnitude and phase from conductance and susceptance values in siemens and degrees.
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AC Circuit Power Calculator
Resolves apparent, real, and reactive power for a single-phase or balanced three-phase AC load from RMS voltage, RMS current, power factor, and phase model.
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Wire Pulling Tension Calculator
Estimate cable pulling tension, conductor weight, sidewall pressure, and tension per conductor from a simplified pull-route model.
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Wheatstone Bridge Calculator
Solve the resistance required for an ideal balanced Wheatstone bridge from three known arm values and the selected unknown position.
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Voltage Sag Calculator
Estimates voltage sag and remaining voltage from system voltage, available fault current, and a load-current step for initial power-quality review.
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VFD Sizing Calculator
Compares required VFD output current with an entered drive rating using motor FLA, application multiplier, derating factor, and system voltage.
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Transformer Voltage Ratio Calculator
Compares primary and secondary voltage values into ideal transformer voltage ratio and inverse voltage relationship.
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Transformer Voltage Drop Calculator
Estimates transformer voltage regulation, voltage drop, and loaded secondary voltage from nameplate resistance, reactance, load level, and power factor.
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Transformer kVA Calculator
Estimates apparent power and real power for a single-phase or balanced three-phase transformer load from line voltage, current, phase, and power factor.
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Transformer Inrush Current Calculator
Estimates transformer rated current and planning inrush current from kVA, voltage, phase, and a documented inrush multiplier.
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Transformer Impedance Calculator
Converts transformer percent impedance to per-unit and ohmic values, then estimates transformer-limited current on the selected voltage and phase base.
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Transformer Current Calculator
Estimates transformer primary and secondary line current from kVA, primary and secondary voltage, and the selected phase model.
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Three-Phase Load Balance Calculator
Compares three entered phase loads, average load, maximum deviation, imbalance percent, and a simple load-transfer reference for panel or feeder review.
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Subpanel Load Calculator
Estimates demand load, feeder current, subpanel utilization, and spare capacity from connected load, an explicit demand factor, system voltage, phase, panel rating, and target margin.
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Stub-Up Bend Calculator
Sets the conduit mark for a 90-degree stub-up from desired stub height minus the take-up value supplied by the bender or field method.
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Solar String Calculator
Compares PV string module counts against cold-weather Voc and inverter MPPT voltage limits using module data, temperature assumptions, and equipment voltage ratings.
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Solar Panel Size Calculator
Estimates preliminary PV array wattage and panel count from daily energy, peak sun hours, system losses, and panel wattage.
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Solar Battery Size Calculator (kWh, Wh, Ah)
Estimate solar battery-bank capacity in kWh, Wh, and Ah from load, autonomy, efficiency, and usable depth of discharge.
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Service Upgrade Calculator
Compares projected demand, service utilization, spare capacity, and headroom margin from an existing service rating, calculated demand, added load, and explicit planning target.
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