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27
Calculator Modules
30+
Standards & Codes
24,217
Automated Tests
42
Countries with PPP Pricing
23
Languages Supported
27 professional calculators, one platform
Built by engineers, for engineers. Every calculation is transparent, traceable, and standards-compliant.
Arc Flash
IEEE 1584 incident energy analysis
Battery/UPS Sizing
Size battery banks and UPS systems per IEEE 485, IEC 62485, AS/NZS 4086
Busbar & Busduct Sizing
Busbar and busduct sizing with thermal, mechanical, and voltage drop verification
Cable Pulling
Physics-based cable installation feasibility — tension, SWBP, jam ratio, conduit fill
Cable Sizing
Size cables for current rating per AS/NZS 3008, BS 7671, IEC 60364
Cable Tray
Cable tray sizing and fill calculations with cross-section visualization
Conduit Fill
NEC Chapter 9 conduit fill — find conduit size or max conductors
Earthing System
Earthing/grounding electrode resistance, touch & step voltage analysis
Emergency Power
Generator, UPS sizing, and emergency load management with load sequencing
EV Charging
EV charger sizing, demand factors, and load management
Harmonic Analysis
IEEE 519 / IEC 61000 harmonic analysis and power quality assessment
HVAC Electrical Sizing
Motor sizing, protection, and cable selection for HVAC equipment
Lighting Design
Lumen method lighting design with layout, glare, and energy compliance
Lightning Risk & Protection
IEC 62305 risk assessment and lightning protection system design
LV Network Design
Multi-node network design with interactive SLD generation
Maximum Demand
Maximum demand assessment with diversity factors
Motor Calculator
FLC, starting current, protection sizing, cable requirements
MV Cable Sizing
MV cable sizing with IEC 60287 thermal rating and charging current
Power Factor
Capacitor bank sizing and power factor correction with harmonic analysis
Protection Coordination
Device coordination and discrimination
Short Circuit
Calculate fault current and verify cable thermal withstand
Solar PV & Energy Storage
PV array sizing, string calculations, and energy storage
Transformer
Impedance, losses, efficiency & protection sizing
Voltage Drop
Analyze voltage drop and maximum cable length
Learn, reference, and master electrical engineering
Free guides, standards references, worked examples, and downloadable tools to complement your calculations.
Methodology Guides
Step-by-step calculation methods with standard clause references and worked equations.
Standards Reference
Quick reference for AS/NZS, BS, IEC, and NEC cable sizing and wiring standards.
Learning Center
Beginner-friendly tutorials explaining core electrical engineering concepts.
Worked Examples
Real-world scenarios with complete solutions and standard compliance checks.
Free Downloads
Pocket reference cards, wall posters, checklists, toolbox talk cards, and printable quick-reference PDFs.
Engineering Blog
Standards updates, industry insights, and calculation tips from practising engineers.
How does ECalPro compare?
Honest, side-by-side comparisons with the tools engineers already know.
ECalPro vs ETAP
Cloud-native SaaS vs $50K desktop suite. 95% of engineering calcs, 99% less cost.
ECalPro vs jCalc
Multi-standard coverage vs AS/NZS-focused. 27 calculators, 30+ standards, 23 languages.
Best Arc Flash Calculators
IEEE 1584-2018 compliant tools compared. PPE categories, incident energy, report output.
Free reference materials for every engineer
Print these pocket-sized reference cards and carry them to site. Each includes a QR code to our full calculator.
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- Standards: AS/NZS 3008, IEC 60364, BS 7671
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Every calculation is tested against published reference data and international benchmarks.
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Cross-validated against CIGRE TB 880 benchmarks
24,000+ Automated Tests
Continuous integration testing on every standard table
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Calculations follow ISO 80000 and IEC methodology
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Standards-compliant electrical calculations with full clause references and audit-ready reports. Free forever, no credit card required.