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.
Buck-Boost Transformer Calculator
Estimate buck-boost winding and adjusted kVA from supply and target voltage, load current, phase arrangement, and a planning multiplier. Final transformer selection remains a manufacturer and installation review.
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Box Offset Calculator
Estimate offset travel, second-bend location, multiplier, and shrink for a box offset using the entered depth, bend angle, and first mark. The result supports field layout and does not replace fitting or bender instructions.
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Battery Runtime Calculator
Estimate battery runtime by converting nominal amp-hour capacity to usable watt-hours and dividing by load power. Battery chemistry, discharge behavior, temperature, BMS limits, and inverter performance require separate review.
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Battery Capacity Calculator (Wh, kWh, Ah)
Estimate battery backup capacity in Wh, kWh, and Ah from load power, runtime, system voltage, usable depth of discharge, and efficiency.
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AWG Wire Resistance Calculator
Estimate conductor resistance from AWG size, material, conductor temperature, one-way length, and the number of conductors in the path. Verify published conductor data when resistance affects design or compliance.
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Appliance Load Calculator
Estimate appliance load and current from row-level VA, quantity, demand factors, continuous multipliers, voltage, phase, and an entered comparison capacity. The result does not apply dwelling, dryer, range, branch-circuit, or service demand rules.
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Watts Amps Volts Calculator
Estimate watts, volts, amps, and apparent power from real power, voltage, phase model, and power factor.
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Voltage Drop Calculator
Review circuit voltage drop and margin from load current, one-way length, conductor resistance, phase model, system voltage, and an entered drop limit. The result does not select a conductor or establish code compliance.
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Voltage Divider Calculator
Calculate voltage-divider output, divider current, effective resistance, and resistor power with or without a load resistance.
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Resistor Color Code Calculator
Calculate a four-band resistor color code value, tolerance, and minimum and maximum resistance from the digit, multiplier, and tolerance bands.
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Reactive Power Calculator
Review reactive-power change from real power and power-factor inputs. This is a screening calculation, not capacitor-bank or harmonic-filter selection.
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Power Factor Calculator
Review power factor and reactive power from real power in kW and apparent power in kVA. This is a screening formula, not a power-quality study.
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Ohm’s Law Calculator
Solve for voltage, current, resistance, or power from known fixed-resistance electrical values.
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Energy Use Calculator (kWh from Watts and Time)
Calculate electricity usage in kWh from watts, quantity, hours per day, and number of days.
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Electricity Cost Calculator
Calculate kWh and cost from power, runtime, billing days, and rate per kWh.
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Shunt Resistor Calculator
Estimate meter-shunt and current-sense resistor values before reviewing power rating, thermal behavior, tolerance, calibration, and instrument requirements.
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Short-Circuit Current Calculator
Estimate available fault current from source voltage and total impedance on a common equivalent-circuit basis, with an optional screening multiplier for preliminary review.
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Series Circuit Calculator
Calculate total series resistance, circuit current, and individual resistor voltage drops from a fixed DC-style source and three resistance values.
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Pull Box Sizing Calculator
Estimate preliminary pull-box dimension references from the largest raceway and same-wall raceway sum before verifying NEC 314.28 and the installed layout.
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Parallel Circuit Calculator
Calculate equivalent resistance, total current, and branch currents for three fixed-resistance branches on a common DC-style voltage basis.
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Motor Starting Current Calculator
Estimate motor starting current from full-load current and a selected starting multiplier, with a voltage-sag reference for preliminary review.
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Motor Starter Current Reference Calculator
Estimate starting current, overload reference current, and starter continuous-current discussion values from motor FLA and entered project assumptions.
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Motor Power From Current Calculator
Estimate motor input power, output power, and horsepower from line current, voltage, phase model, power factor, and efficiency.
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Insulation Resistance Calculator
Calculate a temperature-corrected insulation-resistance worksheet value and compare it with an entered screening reference.
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