Electrical Wire Size Calculator — NEC, IEC, BS, AS/NZS | WireStandard
Multi-standard wire sizing tools for NEC, IEC, BS & AS/NZS
Free electrical wire size calculator supporting NEC, IEC, BS and AS/NZS standards. Wire gauge, voltage drop, ampacity, circuit breaker and conduit fill calculators.
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
Popular Wire Sizing Configurations
Jump directly to the most searched amp and distance combinations.