Electrical Wire Size Calculator — NEC, IEC, BS, AS/NZS | WireStandard
Multi-standard wire sizing tools for NEC, IEC, BS & AS/NZS
Wire Size Calculator
— Find the correct wire gauge for your circuit based on current, distance and voltage
Voltage Drop Calculator
— Calculate voltage drop percentage and pass/fail for 3% and 5% thresholds
Ampacity Calculator
— Calculate derated ampacity with temperature and bundling correction factors
Circuit Breaker Sizing
— Size circuit breakers with NEC 125% continuous load rule applied
Conduit Fill Calculator
— Calculate conduit fill percentage against NEC 40% limit
AWG ↔ mm² Converter
— Full conversion table: AWG to mm², diameter, ampacity and common use
EGC Size Calculator
— Size equipment grounding conductors per NEC Table 250.122, IEC 60364-5-54, BS 7671 and AS/NZS 3000
PoE Voltage Drop Calculator
— Calculate PoE voltage drop for Cat5e/Cat6/Cat6a cable with 2-pair and 4-pair comparison
PoE Power Budget Calculator
— Plan your PoE switch budget with device presets and environment derating