Circuits And Components
Series circuits, parallel circuits, shunts, and component calculation workflows.
Electrical Calculators
Find calculator pages by field task, formula, or reference workflow.
Calculator Categories
Categories group calculators by field workflow and reference context.
Commercial And Industrial Loads
Three-phase load balance, feeder, panel schedule, and commercial load estimate workflows.
Conduit Bending
Saddle, offset, kick, segment, rolling offset, and multiplier workflows for field conduit layout.
Lighting
Lumens, footcandles, fixture count, and lighting energy estimate workflows.
Motors And Starters
Motor current, full-load current, starting current, power, and starter sizing workflows.
Power Quality And Transformers
Transformer kVA, transformer current, generator sizing, and power-quality support workflows.
Power, Energy And Cost
Power factor, reactive power, energy use, and electricity-cost estimate workflows.
Residential Load And Service
Dwelling load, panel load, service size, and NEC 220 demand workflows.
Solar And Backup Power
Battery capacity, runtime, inverter, generator support, solar, backup, and EV charging estimate workflows.
Testing, Protection And Grounding
Insulation resistance, short-circuit current, pull-box sizing, grounding, and protection workflows.
Voltage, Current And Resistance
Ohm law, watts, amps, volts, resistance, and direct electrical formula workflows.
Wire, Raceway And Ampacity
Wire sizing, ampacity, derating, conduit fill, and raceway checks.
Available Calculators
Published calculator workflows ready to use.
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
Use a reviewed base ampacity estimate associated with a conductor size, gauge, or cross-sectional area label, then apply explicit user-supplied decimal factors. Conductor count is a review flag only and does not automatically select an adjustment factor. This preliminary estimate makes no NEC table claim.
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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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