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Voltage Drop Calculator
Calculate voltage drop in wires
Current: $12 AWG, $100ft, $20A, $120V $1Φ
How It Works
Calculate voltage drop in electrical conductors based on wire size, length, and current.
A voltage drop calculator estimates the loss of electrical potential along a conductor due to its resistance. Excessive voltage drop can cause equipment malfunction, reduced efficiency, and overheating. The National Electrical Code recommends less than 3% voltage drop for branch circuits and 5% for feeders. Calculations depend on wire material (copper or aluminum), gauge (AWG), circuit length, and current in amperes.
Results
Enter values to see results
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Quick Tips
- • Results update automatically as you type
- • Use Tab to navigate between fields
- • Press Enter to calculate
Frequently Asked Questions
How does the Voltage Drop Calculator work?
Simply enter your values into the input fields above. The Voltage Drop Calculator uses standard formulas to compute results instantly as you type or click.
Is the Voltage Drop Calculator free?
Yes, this calculator is completely free to use. No registration, no hidden fees, no limits.
How accurate are the results?
Results are computed using industry-standard mathematical formulas. For critical decisions, we recommend consulting a professional.
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