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Work out voltage drop on a DC string or single-phase AC run from length, current, conductor size and material — checked against AS/NZS guidance.
Voltage drop
0.88V
Drop percentage
0.22%
Assessment
Excellent (≤1%)
For a two-wire DC string or single-phase AC run, voltage drop is:
V drop = (2 × length × current × ρ) ÷ area, where the factor of 2 covers the active and return conductors, and ρ is conductor resistivity (~0.0175 Ω·mm²/m for copper, ~0.0282 for aluminium, near 20 °C).V drop ÷ system voltage × 100.AS/NZS 5033caps PV-circuit voltage drop at 3%, and AS/NZS 3000 allows up to 5% total to any point; best practice aims for ≤1% on short runs and ≤2% on longer ones. Real designs use elevated-temperature resistivity and three-phase uses a different factor — this tool is a first check, not a substitute for a licensed electrician's cable sizing.
Estimates only — for guidance, not a quote or engineering specification. Nothing you enter is stored or sent anywhere; the maths runs entirely in your browser.
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