Electrical Calculators
Code-compliant calculators for voltage drop, conduit fill limits, breaker sizing, OHM's law, and AWG references.
3 Phase Voltage Imbalance
Launch the 3 Phase Voltage Imbalance tool to calculate accurate results.
Ac Motor Speed Slip
Launch the Ac Motor Speed Slip tool to calculate accurate results.
NEC Wire Ampacity Derating Calculator
Automatically calculate NEC 310.15 wire derating limits based on extreme ambient temperatures and excessive conduit fill (bundle crowding).
Battery Room Hydrogen Ventilation Calculator
Calculate minimum required exhaust airflow (CFM/L/s) to maintain safe hydrogen LEL concentrations in lead-acid UPS battery rooms per IEEE 484.
Box Fill
Launch the Box Fill tool to calculate accurate results.
Cable Pulling Lubricant Estimator
Launch the Cable Pulling Lubricant Estimator tool to calculate accurate results.
NEC Cable Tray Sizing Calculator
Calculate required cable tray width per NEC Article 392 using the 50% fill ratio rule. Enter cable ODs and quantities to get minimum tray cross-section area and recommended standard tray width (6", 12", 18", 24", 30", 36") for multi-conductor power and control cable installations.
NEC Circuit Load & Breaker Sizing
Calculate total circuit amperage and determine the safe NEC breaker size required to handle both continuous and peak non-continuous loads.
Conduit 3-Bend Saddle Planner
Generate exact tape measure marks for a 3-bend electrical saddle. Calculate shrink amounts, center marks, and outside bend distances for 45-degree and 60-degree saddles.
NEC Conduit Fill & Jam Ratio Capacity
Mathematically calculate conduit wire fill percentages against strict NEC limits, and analyze the exact 3-wire jam risk ratios to prevent subterranean cable damage.
Conduit Nipple Fill (NEC 60%) Capacity
Mathematically calculate NEC Chapter 9 Note 4 wire fill limits for conduit nipples. Automatically override the 40% rule and apply the strict 60% mechanical threshold when runs are under 24 inches.
Advanced Conduit Offset Bending
Mathematically calculate multiplier marks and shrinkage for electrical conduit offsets. Map trigonometry against depth, distance, and pipe loss to execute perfect 30, 45, and 60-degree bends.
Conduit Pull Tension
Launch the Conduit Pull Tension tool to calculate accurate results.
NEC Conduit Support Spacing Limits
Determine mandatory maximum strap support spacing for EMT, Rigid, and PVC conduit according to strict NFPA 70 National Electrical Code standards.
Data Center PUE & DCiE Diagnostics
Determine Power Usage Effectiveness (PUE) and Data Center Infrastructure Efficiency (DCiE) to calculate exact electrical cooling overhead and wasted facility compute ratios.
DC Circuit Voltage Drop Limits
Mathematically map critical voltage loss for off-grid, marine, and automotive DC systems using exact copper resistance and loop-distance friction.
Solar DC Ampacity & Wire Sizing Limiters
Mathematically determine the exact AWG copper wire gauge required for off-grid solar and low-voltage DC battery banks. Calculate Circular Mils to defeat catastrophic thermal sag.
AC Single-Phase EXACT Voltage Drop Engine
Mathematically calculate the absolute voltage drop of a single-phase AC circuit using the strict NEC Circular-Mil constant (K=12.9 Copper / 21.2 Aluminum).
Available Fault Current & AIC Rating Calculator
Calculate transformer-terminal symmetrically bolted fault current (SCA) and minimum breaker AIC rating requirements. NEC 110.9 compliance engine using the impedance multiplier method.
GEC Sizing Calculator — NEC Table 250.66
Determine the minimum Grounding Electrode Conductor (GEC) size per NEC 250.66 based on service entrance conductor material and gauge. Includes ground rod, Ufer, and water pipe electrode exceptions.
Generator Gas Pipe Sizing Calculator (NG & LP)
Select the minimum required schedule 40 black iron gas pipe diameter for standby generators based on total BTUH demand and measured run length. Avoid generator fuel starvation and pressure drops during startup surges.
Backup Generator Sizing & Load Calculator
Determine exactly what size standby or portable generator you need. Calculate continuous running watts and single-motor surge startup watts for your essential household appliances.
Ground Fault Loop Impedance Calculator (Zs)
Calculate total Earth Fault Loop Impedance (Zs) to verify circuit safety compliance. Determine if fault currents are high enough to trip breakers within the mandatory 0.4-second window.
NEC Grounding Electrode Conductor Size Calculator
Determine the exact AWG / kcmil gauge requirement for main service Grounding Electrode Conductors (GEC) based on National Electrical Code Table 250.66.
Ieee Arc Fault Current
Launch the Ieee Arc Fault Current tool to calculate accurate results.
Electrical Knockout & Hole Saw Calculator
Convert nominal electrical conduit Trade Sizes (1/2 to 4-inch) into the exact physical fractional hole saw or hydraulic punch dimensions required for panel entry.
LED Strip Voltage Drop Calculator
Calculate DC voltage drop for 12V and 24V LED strip lighting. Determine if power injection or thicker AWG wire is required to prevent dimming and color shift.
Lighting & Foot-Candle Sizing Calculator
Calculate the total required fixture array and bare lumens needed to achieve a target foot-candle illumination density for any commercial or residential space.
Lighting Uniformity Ratio Calculator
Calculate critical commercial Avg/Min and Max/Min illuminance uniformity ratios for safety code compliance.
Lumen Depreciation Factor (LLMF) Calculator
Calculate specific LED baseline light-loss maintenance factors across targeted time durations using natural exponential decay formulas.
Electric Motor FLA & Branch Circuit Breaker Calculator
Estimate standard Full Load Amps (FLA) for single and 3-phase AC motors. Calculate Minimum Circuit Ampacity (MCA) and standard breaker sizes using the NEC 125% continuous load rule.
Motor Run & Start Capacitor Sizing Calculator
Estimate full-load amps (FLA) and calculate the required Run and Start capacitor microfarad (µF) ratings for single-phase motors.
Motor Locked Rotor Amps (LRA) Calculator
Calculate initial electromagnetic locked rotor inrush current spikes based strictly on AC motor HP and NEMA Nameplate code letters.
Motor Locked Rotor Amps
Launch the Motor Locked Rotor Amps tool to calculate accurate results.
Motor Overload (Heater) Sizing Calculator (NEC)
Determine exact National Electrical Code (NEC) maximum permitted thermal overload trip limits using FLA, Service Factor, and Temperature Rise data.
Motor Slip
Launch the Motor Slip tool to calculate accurate results.
Motor Startup Voltage Drop Calculator
Calculate extreme instantaneous voltage drop at the motor terminals during electromagnetic locked-rotor inrush (LRA) to prevent contactor chatter and stalls.
NEC Whole-House Load Estimator
Estimate your residential main service ampacity requirements according to NEC Article 220 standard calculations and demand factors.
NEMA Motor Starter Sizing Calculator
Determine the required NEMA size (00 to 9) for magnetic motor starters and contactors based on horsepower, phase, and system voltage according to NEMA ICS 2 standards.
Neutral Sizing
Launch the Neutral Sizing tool to calculate accurate results.
Ohm's Law Calculator
Instantly calculate Voltage, Current (Amps), Resistance (Ohms), or Power (Watts) by entering any two known circuit parameters.
Peukert Battery Capacity
Launch the Peukert Battery Capacity tool to calculate accurate results.
Power Over Ethernet (PoE) Voltage Drop Calculator
Determine DC voltage loss, heat dissipation, and true delivered voltage on Cat5e/Cat6 runs powering Access Points and PTZ cameras over long distances.
Point To Point Fault Current
Launch the Point To Point Fault Current tool to calculate accurate results.
Power Factor Correction Kvar
Launch the Power Factor Correction Kvar tool to calculate accurate results.
Power Factor Correction
Launch the Power Factor Correction tool to calculate accurate results.
Pull Box Sizing
Launch the Pull Box Sizing tool to calculate accurate results.
Pv Combiner Fuse Sizing
Launch the Pv Combiner Fuse Sizing tool to calculate accurate results.
Pv String Sizing
Launch the Pv String Sizing tool to calculate accurate results.
Rc Time Constant
Launch the Rc Time Constant tool to calculate accurate results.
Short Circuit Current Rating Sccr
Launch the Short Circuit Current Rating Sccr tool to calculate accurate results.
Three Phase Voltage Drop
Launch the Three Phase Voltage Drop tool to calculate accurate results.
Transformer Fla
Launch the Transformer Fla tool to calculate accurate results.
Transformer Inrush Current Sizing Calculator
Determine primary Full Load Amps (FLA) and model maximum theoretical inrush current fault spikes using transformer impedance values.
Transformer kVA Size Calculator | 1-Phase & 3-Phase
Size single-phase and three-phase electrical transformers. Input your load amperage and voltage to determine base kVA, then apply the NEC 125% continuous load rule to find the correct standard commercial transformer size.
Transformer OCPD Sizing Calculator (NEC 450.3)
Determine legally compliant primary and secondary overcurrent protection device (OCPD) sizes for transformers per NEC Table 450.3(B).
Transformer Short Circuit Fault Current Calculator (Infinite Bus)
Calculate the absolute maximum available short-circuit fault current at a transformer's secondary terminals. Essential for specifying safe AIC breaker limits and preventing arc flash explosions.
Transformer Tap Rules Calculator (NEC 240.21)
Determine legally compliant drop conductor wire sizing under the NEC 240.21(B) 10-Foot and 25-Foot breaker tap rules. Calculates 10% and 33.3% minimum ampacity thresholds instantly.
NEC 300.5 Trench Depth Calculator
Determine mandatory OSHA and NEC excavation targets for direct burial, PVC raceways, and rigid metal conduits across all environmental locations.
OSHA Trench Shoring & Sloping Calculator
Determine safe visual sloping widths and massive excavation dirt volumes required to secure OSHA compliance in Type A, B, and C hazard soils.
Ups Sizing
Launch the Ups Sizing tool to calculate accurate results.
Electrical Voltage Drop Calculator (VD)
Calculate NEC compliance for voltage drop across long wire runs. Compute copper/aluminum resistance limits for single-phase and three-phase circuits.
Electrical Wire Pull Tension & Sidewall Pressure Estimator
Calculate extreme tension forces and sidewall bearing limits for heavy commercial conduit pulls. Account for Capstan effect multipliers across 90-degree sweeps.
NEC Wire Size (AWG) Ampacity Selector
Select code-compliant American Wire Gauge (AWG) based on amperage draw, temperature rating, and material, fully compliant with NEC Table 310.16 standards.