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.
Raceway Size Calculator
Compare conductor area requirements with a selected raceway area and entered fill limit for preliminary raceway review.
Open calculator
Raceway Fill Area Calculator
Estimate allowable fill area, remaining area, and reserved share from entered raceway dimensions and planning assumptions.
Open calculator
PV String Voltage Calculator
Estimate cold PV string Voc and STC Vmp, then compare string voltage with an entered inverter maximum for preliminary equipment review.
Open calculator
PV Array Tilt Calculator
Compare fixed PV array tilt with site latitude and estimate tilt offset, cosine alignment, and screened daily energy from a documented baseline.
Open calculator
PV Array Azimuth Calculator
Compare PV array azimuth with a project reference direction and estimate circular-angle alignment from an entered daily-energy baseline.
Open calculator
PT Ratio Calculator
Estimate a measured potential-transformer voltage ratio and signed ratio error from primary, secondary, and nominal ratio entries.
Open calculator
Protective Relay Time Calculator
Apply externally supplied inverse-time relay curve constants to a fault-current multiple and compare the operating time with an entered limit.
Open calculator
Protective Relay Pickup Calculator
Convert a secondary relay pickup setting through a CT ratio and compare the primary pickup with available fault current.
Open calculator
Protective Device Clearing Time Calculator
Compare measured or curve-derived protective-device clearing time with an entered limit and report margin, ratio, and review comparison.
Open calculator
PPE Category Screen Calculator
Compare recorded incident energy with a recorded arc rating and show the entered margin while leaving PPE category selection to qualified review.
Open calculator
Power Triangle Angle Calculator
Estimate power factor, reactive-power magnitude, and power-triangle angle from known kW and kVA values, with leading or lagging sign left to external review.
Open calculator
Power From Energy And Time Calculator
Convert watt-hours and elapsed hours into average power in watts and kilowatts without implying peak demand or equipment rating.
Open calculator
Power Factor Penalty Calculator
Estimate current and threshold apparent power, excess kVA, and the resulting rate-based charge from entered power-factor and billing assumptions.
Open calculator
Power Analyzer Sampling Calculator
Compare an analyzer sample rate with the Nyquist screening minimum implied by the entered fundamental frequency and harmonic order.
Open calculator
Polarity Test Calculator
Estimate voltage magnitude and margin, then compare the measured sign and magnitude with the entered test criteria.
Open calculator
Photocell Load Calculator
Estimate connected load, annual kWh, and annual cost from fixture count, duty schedule, operating days, and entered electricity rate.
Open calculator
Phase Sequence Check Calculator
Estimate relative phase angles, then compare the observed sequence and spacing with the entered expectation.
Open calculator
Peak To RMS Voltage Calculator for Sine Waves
Convert peak voltage to RMS and peak-to-peak voltage for a sinusoidal waveform.
Open calculator
Peak Demand Calculator
Estimate diversified peak demand and compare it with entered service capacity for preliminary load review.
Open calculator
Parallel Raceway Ampacity Calculator
Estimate equal current sharing and adjusted ampacity margin from the entered parallel-raceway count, ampacity, and adjustment factor.
Open calculator
Panel Capacity Calculator
Estimate a panel load screen from existing and planned current, then compare it with an entered panel rating and reserve target.
Open calculator
Oscilloscope Timebase Calculator
Estimate displayed time window, waveform period, and frequency from an entered oscilloscope timebase, division count, and visible cycles.
Open calculator
Oscilloscope Bandwidth Calculator
Estimate signal-frequency bandwidth needs before checking oscilloscope and probe specifications.
Open calculator
Optional Method Dwelling Load Calculator
Keep row-level dwelling load arithmetic visible while preserving the entered method and source records for qualified review.
Open calculator