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.
VFD DC Bus Voltage Calculator
Compare expected and measured VFD DC bus voltage and express recorded ripple as a percentage.
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Transformer Winding Resistance Temperature Calculator
Normalize transformer winding resistance to a reference temperature for comparison of documented test readings.
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Transformer Turns-Ratio Test Calculator
Compare measured transformer turns ratio with an expected nameplate ratio by tap or test point.
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Transformer Tap Voltage Calculator
Calculate no-load secondary voltage at a signed tap position and identify the nearest listed tap for a target voltage.
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Transformer Regulation Calculator
Calculate transformer voltage regulation and voltage difference from no-load and full-load measurements.
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Transformer Losses Calculator
Calculate total transformer loss, input power, and efficiency from core loss, load loss, and output power.
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Transformer K-Factor Calculator
Calculate transformer K-factor from a harmonic current spectrum using an explicit reference basis.
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Transformer Efficiency Calculator
Calculate transformer efficiency from measured input and output power, including efficiency percentage and power loss.
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Transformer All-Day Efficiency Calculator
Calculate time-weighted transformer efficiency and daily energy values from entered loss data and a load profile.
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Thevenin Equivalent Calculator
Enter the Thevenin voltage, Thevenin resistance, and load resistance to evaluate source loading, terminal voltage, and resistive power.
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Solar Self-Consumption Calculator
Compare time-aligned PV generation and site load, with optional battery flows, in a transparent behind-the-meter energy balance.
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RMS Voltage Calculator
Convert a measured or modeled peak voltage to RMS voltage; 0.7071 applies to a verified sinusoidal waveform.
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RMS Current Calculator
Calculate RMS current from a sine-wave peak, verified waveform factor, equally spaced samples, or separate AC and DC components.
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RL Time Constant Calculator
Enter resistance and inductance to calculate the first-order RL time constant and its five-time-constant settling reference.
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Series Resistor Value Calculator
Calculate the equivalent resistance of three fixed resistors in series for component-level circuit review. Final component selection still requires rated voltage, power, tolerance, and application checks.
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Resistor Power Rating Calculator
Evaluate resistor dissipation and a preliminary minimum wattage from the entered electrical values. Confirm the exact part's thermal, pulse, and maximum-working-voltage ratings before selection.
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Parallel Resistor Value Calculator
Calculate the equivalent resistance of three fixed resistors in parallel for component-level circuit review. Final component selection still requires rated voltage, power, tolerance, and application checks.
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Residential Well Pump Electrical Load Calculator
Enter nameplate or measured running-current data to review a private-well pump's operating electrical load. The result is not a pump selector or final circuit-sizing value.
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Residential Well Pump Duty-Point Power Calculator
Enter flow, total dynamic head, and pump/motor efficiency for a duty-point power review. The result does not select a pump curve or guarantee pressure.
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Residential Sump Pump Backup Runtime Calculator
Review an intermittent sump-pump backup scenario using named pump and backup-equipment data. The result does not guarantee flood protection or emergency runtime.
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Residential Panel Phase Balance Calculator
Enter residential panel branch-circuit assignments and load currents for a preliminary 120/240 V or 120/208 V distribution review.
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Residential EV Group Power Sharing Calculator
Allocate a fixed power cap across two or more EVSE or vehicle requests under an explicit sharing policy. The model does not infer product behavior.
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Residential EV Daily Energy and Charger Power Calculator
Convert daily driving, vehicle efficiency, charging efficiency, and available home-charging time into an average EV charging-power requirement.
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Residential EV Circuit Sharing Capacity Calculator
Review a named shared-circuit rule with an entered circuit limit, EVSE cap, appliance schedule, and battery-energy requirement.
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