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.
Fuse Coordination Screen Calculator
Compare entered upstream and downstream clearing times and report the arithmetic margin for preliminary protection review.
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Fixture Spacing Calculator
Calculate rectangular-room fixture spacing, rows, columns, and count from mounting height and spacing criterion.
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Fixture Count Calculator
Calculate preliminary fixture quantity from area, target footcandles, fixture lumens, coefficient of utilization, and light-loss factor.
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Fault Loop Impedance Calculator
Calculate measured and lead-corrected fault-loop impedance from entered test voltage and current without making a trip-time or acceptance decision.
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Extension Cord Voltage Drop Calculator
Screen extension-cord voltage drop and entered rating margin as a voltage-drop workflow mode; it does not approve safe use.
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Exit Sign Load Calculator
Calculate total exit-sign load and optional emergency-duration energy from sign wattage, count, and duration.
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EV Solar Charging Calculator
Calculate allocated PV energy, EV-delivered energy, driving miles, and remaining grid energy from entered solar and EV assumptions.
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Equipment Short Circuit Rating Calculator
Compare entered equipment SCCR with available fault current and show margin and rating utilization.
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Equipment Grounding Conductor Size Calculator
Compare selected conductor area with an entered EGC required area and show the arithmetic margin.
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Energy Intensity Calculator
Calculate energy and cost intensity from annual electricity use, served floor area, and energy rate for a building-level screening view.
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Energy From Power And Time Calculator
Calculate electrical energy in watt-hours and kilowatt-hours by multiplying constant power by elapsed time.
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Energy Cost per Device Calculator
Calculate per-device energy and cost from device watts, quantity, runtime, operating days, and energy rate, with total annual cost for the repeated load.
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Enclosure IP Rating Screen Calculator
Compare entered dust and water protection digits with project minimums and show the resulting margins without treating the output as product certification.
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Enclosure Heat Dissipation Calculator
Calculate enclosure temperature rise, internal temperature, and margin from internal heat, ambient temperature, and thermal resistance.
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Emergency Lighting Duration Calculator
Calculate emergency lighting runtime from usable battery energy, emergency load, conversion efficiency, and reserve assumptions.
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Electrical Safe Work Distance Calculator
Convert and compare recorded work-distance values against a stated reference without creating a safe-work boundary or compliance decision.
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Electrical Inspection Checklist Calculator
Summarize checklist rows, count pass, fail, and not-applicable outcomes, and flag required failed items for qualified review.
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Dwelling Pool Equipment Load Calculator
Compare entered pool equipment loads with panel or service capacity while keeping Article 680, bonding, grounding, and protection review separate.
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Dwelling Load Schedule Calculator
Compare entered dwelling load schedule groups with an entered capacity while keeping NEC method selection and service sizing separate.
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Dwelling Hot Tub Load Calculator
Compare entered hot-tub component loads with entered circuit capacity while keeping protection, bonding, and manufacturer review separate.
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Dwelling Garage Load Calculator
Compare entered garage load with panel or service capacity and show the EV allowance share of the entered total.
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Dwelling Detached Structure Load Calculator
Calculate entered detached-structure load, planned load with spare, and feeder-capacity margin from lighting, receptacle, equipment, and HVAC values.
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Dwelling Addition Load Calculator
Calculate added connected load, entered-coincidence planned peak, and service-capacity margin from dwelling addition values.
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Dimming Energy Savings Calculator
Calculate annual kWh and cost savings when dimming reduces average lighting power over a stated schedule.
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