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.
Polarization Index Calculator
Estimates the 10-minute-to-1-minute insulation-resistance ratio and compares it with an entered reference PI. The result is a comparison calculator, not an acceptance decision.
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Impedance Calculator
Estimates AC impedance magnitude, phase angle, and power-factor magnitude from resistance and reactance values already matched to the frequency under review.
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Heat Pump Electrical Load Calculator
Estimates heat-pump equipment VA, auxiliary-heat VA, total load, and panel current from nameplate MCA, auxiliary heat, voltage, and phase.
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Harmonic Distortion Calculator
Estimates THD and each listed harmonic as a percentage of the fundamental from entered fundamental and harmonic RMS values.
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Grounding Resistance Calculator
Estimates single-rod and combined grounding resistance from soil resistivity, rod geometry, rod count, and spacing. The result is a model calculation, not a field test.
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Generator Size Calculator
Estimates planning running and surge ratings, plus an apparent-power basis, from running watts, starting loads, power factor, and margin.
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Footcandle Calculator
Estimates average illuminance in footcandles and lux from fixture lumens, area, coefficient of utilization, and light loss factor.
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Feeder Load Calculator
Estimates feeder VA and line current from connected load, demand factor, continuous-load treatment, voltage, and phase.
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EV Charging Time Calculator
Estimates EV charging time, grid energy, and miles added from battery capacity, state-of-charge window, charger power, efficiency, and vehicle efficiency.
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EV Charger Load Calculator
Estimate the panel or service load impact of one or more EVSE units using entered charger current, quantity, continuous-load factor, voltage, phase, existing load, and rating.
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EV Charger Circuit Size Calculator
Estimate EVSE circuit ampacity and apparent load from entered charger current, voltage, phase, continuous-load factor, conductor ampacity, and OCPD values.
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Emergency Lighting Battery Calculator
Estimate emergency-lighting battery energy and amp-hour requirements from the connected load, required runtime, battery voltage, usable capacity, conversion efficiency, and reserve.
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Dryer Load Calculator
Estimate connected dryer load, demand-adjusted VA, and line current from entered nameplate rating, dryer quantity, demand factor, voltage, and phase.
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Current Divider Calculator
Estimate ideal current division in a fixed-resistance parallel circuit from total current and up to three branch resistance values.
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Continuous Load Calculator
Estimate adjusted continuous-load current and VA from entered load current, continuous portion, multiplier, voltage, phase, and available ampacity.
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Continuity Test Calculator
Correct a continuity-test resistance reading for entered lead resistance and compare it with a reference threshold; test current is recorded for context only.
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Conduit Cut Length Calculator
Add straight conduit runs, bend count, shrink per bend, and optional waste allowance to create a transparent cut-length calculation.
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Conduit Body Fill Calculator
Estimates conduit-body fill from conductor area, conductor count, an entered splice or device allowance, and verified body capacity. It does not reproduce conduit-body tables.
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Conductor Resistance Temperature Calculator
Estimates conductor resistance at a second temperature from a known resistance basis and temperature coefficient. The calculation does not identify conductor material or select wire size.
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Concentric Bend Calculator
Space parallel conduit bends from the inside radius, conduit spacing, bend angle, and number of segments, with arc-length and chord references for layout.
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Commercial Load Calculator
Estimates connected VA, demand-adjusted load, continuous-load addition, and line current from entered commercial load blocks and phase data.
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Capacitor Code Calculator
Decode common three-digit capacitor markings and convert the nominal value between pF, nF, and uF. Confirm the full marking and component rating before applying the result.
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Capacitor Bank Size Calculator
Estimate required power-factor correction kVAR and capacitance per phase from real power, current and target power factor, system voltage, frequency, and capacitor connection.
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Cable Bend Radius Calculator
Estimate cable bend geometry from a verified outside diameter, manufacturer or project bend-radius multiplier, and bend angle. Confirm the resulting radius against the cable's published requirements.
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