Box Offset Calculator
Use this focused box-offset workflow when conduit must clear a box or fitting. It keeps the box depth and reference distance visible without assuming a specific bender.
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Check conduit bends, wire and raceway limits, load estimates, motor values, circuits, and testing with clear inputs and transparent formulas.
Most Used Calculators
Choose a calculator by task, then review the inputs, formula, and limitations before you use the result.
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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Appliance Load Calculator
Use this appliance load workflow for preliminary row-by-row household appliance load arithmetic when appliance VA, quantity, demand factors, continuous multipliers, voltage, phase, and a comparison ampere value are known.
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Electrical Load Calculator
Enter line voltage, phase count, load current, power factor, and utilization percentage to create a transparent U.S. English preliminary electrical-load estimate for motors and related equipment planning. For balanced three-phase input, line voltage means line-to-line voltage. The utilization percentage scales the entered load current before power is estimated.
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Capacitor Code Calculator
Use this component-code workflow to decode common three-digit capacitor markings. Confirm the full marking and component rating before use.
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Ohm's Law Calculator
Enter the known electrical values and choose what to solve for. This is an educational fixed-resistance estimate, not an equipment-selection or code-compliance result.
Open calculatorFind Tools For Your Work
Choose an entry point that matches how you approach the electrical task.
Field-ready checks
Saddle, offset, kick, segment, rolling offset, and multiplier workflows for field conduit layout.
Plan the job
Dwelling load, panel load, service size, and NEC 220 demand workflows.
Check the method
Series circuits, parallel circuits, shunts, and component calculation workflows.
Learn by doing
Browse the full published calculator set and use the site search when you need supporting articles.
Browse By Category
Move from the job context to the calculator category that matches it.
Conduit Bending
Saddle, offset, kick, segment, rolling offset, and multiplier workflows for field conduit layout.
Wire, Raceway And Ampacity
Wire sizing, ampacity, derating, conduit fill, and raceway checks.
Residential Load And Service
Dwelling load, panel load, service size, and NEC 220 demand workflows.
Motors And Starters
Motor current, full-load current, starting current, power, and starter sizing workflows.
Circuits And Components
Series circuits, parallel circuits, shunts, and component calculation workflows.
Voltage, Current And Resistance
Ohm law, watts, amps, volts, resistance, and direct electrical formula workflows.
Power, Energy And Cost
Power factor, reactive power, energy use, and electricity-cost estimate workflows.
Power Quality And Transformers
Transformer kVA, transformer current, generator sizing, and power-quality support workflows.
Lighting
Lumens, footcandles, fixture count, and lighting energy estimate workflows.
Solar And Backup Power
Battery capacity, runtime, inverter, generator support, solar, backup, and EV charging estimate workflows.
Commercial And Industrial Loads
Three-phase load balance, feeder, panel schedule, and commercial load estimate workflows.
Testing, Protection And Grounding
Insulation resistance, short-circuit current, pull-box sizing, grounding, and protection workflows.
Keep the work moving.
Open the calculator library when you know the task, or search by the field question you need to answer.