Every tool you need for power system studies
Short circuit analysis, load flow, auto equipment sizing, NEC-compliant calculators, and worked examples, all in your browser.
Start FreeCore Analysis
Short circuit, load flow, single line diagrams, and auto equipment sizing — the foundation of every power system study.
Short Circuit Analysis SoftwareRun ANSI/IEC short circuit studies in your browser. Three-phase and line-to-ground fault currents, automatic duty checks, and instant results. Start free.Load Flow Analysis SoftwareWeb-based load flow analysis with real-time bus voltages, branch flows, and voltage drop. Newton-Raphson method. No installs. Start free.Single Line Diagram SoftwareBuild single line diagrams in your browser with drag-and-drop. Built-in device libraries, auto-connect, and live calculations. No installs. Start free.Auto Equipment Sizing SoftwareAutomatic cable, breaker, and transformer sizing per NEC 2023. Sizes update live as you change the model. Override when needed. Start free.ANSI Short Circuit Analysis SoftwareANSI/IEEE short circuit analysis with momentary, interrupting, and steady-state fault currents. Automatic duty checks. Browser-based. Start free.
Sizing Calculators
NEC-compliant calculators for cables, breakers, transformers, motors, generators, conduit fill, and more.
Cable Sizing Calculator per NECSize cables automatically per NEC 2023. Ampacity tables, derating factors, voltage drop, and parallel conductors. Integrated with your one-line. Start free.Voltage Drop CalculatorCalculate voltage drop across your entire electrical system. Integrated with load flow analysis. Identify issues before they become problems. Start free.Fault Current CalculatorCalculate fault currents at every bus in your system. Three-phase, line-to-ground, momentary, and interrupting values. ANSI/IEC methods. Start free.Breaker Sizing CalculatorSize breakers and fuses per NEC 240 automatically. Standard trip sizes, automatic duty checks, and live updates. Integrated with your one-line diagram. Start free.Transformer Sizing SoftwareSize transformers based on connected load and system requirements. Integrated with load flow and short circuit analysis. Live updates. Start free.One Line Diagram MakerCreate one line diagrams online with built-in calculations. Drag-and-drop builder, device libraries, and live short circuit and load flow. Start free.Motor Feeder Sizing CalculatorSize motor feeders per NEC 430. Conductor ampacity, OCPD sizing, and voltage drop for motor circuits. Automatic, integrated with your one-line. Start free.Service Entrance Sizing CalculatorSize service entrance equipment per NEC. Main breaker, service conductors, grounding electrode conductor. Integrated with load calculations. Start free.Panel Schedule CalculatorCalculate panel loading, check capacity, and verify breaker sizing. See connected load, demand load, and available capacity. Integrated analysis. Start free.Generator Sizing CalculatorSize standby and emergency generators based on connected load. Motor starting impact, load stepping, and system analysis. Integrated with your one-line. Start free.Conduit Fill CalculatorCalculate conduit fill percentage per NEC Chapter 9. Automatic conductor area lookup, trade size selection, and fill compliance. Integrated with sizing. Start free.Demand Load CalculatorCalculate electrical demand load per NEC 220. Demand factors, connected load summaries, and service sizing. From your actual model, not a spreadsheet. Start free.Power Factor Correction SizingSize power factor correction capacitors from your load flow analysis. See real and reactive power flow, target power factor, and kVAR requirements. Start free.UPS Sizing CalculatorSize UPS systems based on connected critical load. kVA requirements, battery runtime, and system integration. From your one-line diagram model. Start free.Switchgear Sizing SoftwareSize switchgear based on calculated demand and available fault current. AIC verification, bus rating checks, and main breaker sizing. Integrated analysis. Start free.
Worked Examples
Step-by-step calculation examples showing exactly how ekx solves real engineering problems.
Short Circuit Calculation ExampleSee how short circuit calculations work with a real example. Build a system, get fault currents, check device duties. Interactive, not just theory. Start free.Load Flow Calculation ExampleSee load flow analysis in action. Build a system, see bus voltages and branch flows update live. Interactive example, not just theory. Start free.Electrical Load Calculation for BuildingsCalculate electrical loads for commercial and industrial buildings. Connected load, demand factors, and service sizing per NEC. From your model, not a spreadsheet. Start free.Voltage Drop Calculation ExampleSee voltage drop calculations work on a real system. Build circuits, set cable lengths, and watch voltage drop calculate across every path. Interactive. Start free.Cable Ampacity CalculationCalculate cable ampacity per NEC 310. Temperature correction, conduit fill derating, continuous load factors. Automatic, integrated with sizing. Start free.Transformer Sizing ExampleSee transformer sizing work in a real system. kVA from connected load, impedance in the model, voltage and fault current impact. Interactive example. Start free.AIC Rating Verification SoftwareVerify equipment AIC ratings against calculated available fault current. Automatic checks at every bus. Flag underrated equipment instantly. Start free.
Standards & Use Cases
NEC compliance, ANSI methods, online studies, PDF reports, and system design — all in one platform.
Online Power System StudiesRun short circuit, load flow, and equipment sizing studies online. No software to install. Cloud-saved results. Professional reports. Start free.Web-Based Electrical Analysis SoftwareElectrical analysis software that runs in your browser. Short circuit, load flow, equipment sizing. No installs, no dongles, no IT headaches. Start free.Electrical Study ReportsGenerate professional short circuit, load flow, and equipment sizing study reports. One-click PDF export. Custom title blocks. Start free.NEC Compliance SoftwareEquipment sizing per NEC 2023. Cable ampacity, OCPD sizing, derating factors, and voltage drop — all checked automatically. Start free.Electrical System Design SoftwareDesign electrical systems with integrated analysis. One-line diagram, short circuit, load flow, and equipment sizing in one browser-based tool. Start free.Power Distribution Design SoftwareDesign power distribution systems with integrated analysis. From utility service to branch circuits. Load flow, fault current, and sizing in one tool. Start free.Industrial Power System Analysis SoftwarePower system analysis for industrial facilities. Motor loads, large transformers, high fault currents. Short circuit, load flow, and sizing. Start free.
Compare Alternatives
See how ekx stacks up against legacy desktop tools like ETAP, SKM PowerTools, and EasyPower.
ETAP AlternativeLooking for an ETAP alternative? ekx offers short circuit, load flow, and equipment sizing at a fraction of the cost. Web-based, no dongles. Start free.SKM PowerTools AlternativeLooking for an SKM PowerTools alternative? ekx offers short circuit, load flow, and equipment sizing in a modern web app. No installs. Start free.EasyPower AlternativeLooking for an EasyPower alternative? ekx offers short circuit, load flow, and equipment sizing online. No installs, no five-figure license. Start free.
Built For
Purpose-built workflows for electrical consultants, facility engineers, and small engineering firms.
Power System Software for Electrical ConsultantsShort circuit, load flow, and equipment sizing for electrical consultants. Lower overhead, faster deliverables, professional reports. Start free.Power System Analysis for Facility EngineersQuick power system studies for facility engineers. Short circuit, load flow, and equipment sizing without the cost and complexity of enterprise tools. Start free.Power System Software for Small Engineering FirmsAffordable power system analysis for small electrical engineering firms. Short circuit, load flow, and sizing without the enterprise price tag. Start free.
Stop fighting your legacy software.
Build the one-line, get short circuit and load flow results, and auto-size your equipment. Takes minutes, not days.
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