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.
Motor Current Calculator
Estimate motor running current from horsepower and operating assumptions for preliminary load, voltage-drop, and feeder review.
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Full-Load Current Estimate Calculator
Estimate motor full-load current from horsepower, voltage, phase count, efficiency, and power factor before verified nameplate or table review.
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Demand Factor Estimate (NEC 220 Context)
Estimate demand from two user-defined load blocks, entered factor percentages, and an optional fixed allowance; NEC article references remain contextual.
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Electrical Load Calculator
Estimate apparent power, real power, and reactive-power magnitude from line voltage, load current, phase model, power factor, and utilization.
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Wire Size Calculator (Voltage Drop and Resistance Check)
Check conductor voltage drop and the resistance target implied by the allowed drop.
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Wire Derating Calculator
Estimate adjusted ampacity from a verified base ampacity and entered ambient-temperature and bundling factors; conductor count remains a review flag.
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Segment Bend Calculator
Use total bend angle, number of segment bends, desired radius, and a start mark to lay out equal segment bend marks.
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Residential Load Calculator
Enter the service voltage and four preliminary load estimates to calculate connected load, demand from the entered factor, current at the entered voltage, and diversity allowance. This transparent U.S. English model does not reproduce NEC demand rules or determine a compliant service size.
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Parallel Offset Calculator
Use offset rise, bend angle, conduit center spacing, first mark, and conduit count to lay out staggered marks for parallel conduit offsets.
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Offset Bend Calculator
Use rise height, bend angle, and the first mark distance from the conduit end to estimate the second mark and offset layout geometry.
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Kick Bend Calculator
Use kick or rise height, bend angle, and the distance from the conduit end to the bend mark to estimate the obstruction edge mark and related layout measurements.
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Electrical Service Size Calculator
Use service voltage, phase count, a user-supplied real-power demand basis, power factor, and a target utilization percentage to create a transparent U.S. English preliminary service-size estimate. This calculator does not perform an NEC service calculation, service sizing, or code-compliant service-rating selection.
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Electrical Panel Load Calculator
Add three circuit load-current estimates to create a transparent preliminary estimate using the entered panel voltage, phase count, panel nameplate rating, and target reserve percentage.
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Conduit Fill Calculator
Enter the raceway internal area, the cross-sectional area of one conductor, and the conductor count to estimate occupied area and fill ratio in square inches.
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Ampacity Calculator
Estimate adjusted conductor ampacity from a reviewed base value and explicit adjustment and temperature factors.
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Saddle Bend Calculator
Calculate 3-point saddle bend layout marks from obstruction height, outside bend angle, and center mark location.
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