Electrical Calculator
Voltage Drop Calculator
NEC · BS7671 · AS/NZS 3000 · CEC · IEC 60364 — with code references
⚙️ Select Standard & System Type
🇺🇸 NEC (USA)
🇬🇧 BS7671 (UK)
🇦🇺 AS/NZS 3000
🇨🇦 CEC (Canada)
🌐 IEC 60364
📐 Circuit Parameters
Please fill in all required fields (Voltage, Current or Load, and Length).
PASS
—
Voltage Drop (V)
—
Drop (%)
—
End Voltage (V)
Need code lookup on the job site?
VoltageLab's AI Code Lookup has every NEC article, BS7671 regulation, AS/NZS clause, and CEC rule explained in plain English — searchable from your phone in seconds. Built for electricians, journeymen, and exam candidates.
Formulas: Single-phase & DC: VD = (2 × K × I × L) / A | Three-phase: VD = (√3 × K × I × L) / A
K = resistivity (copper: 12.9 for AWG/ft, 0.0172 for mm²/m | aluminium: 21.2, 0.0282)
Results are indicative. Always verify with a licensed electrical engineer before installation.
