Elec Voltage Drop Calculator

Estimate voltage drop using verified cable data, with clear assumptions and limitations. Educational guidance only.

Elec Voltage Drop Calculator helps you estimate voltage drop using cable data and circuit details you provide. Enter your design current, one-way cable length, nominal voltage and a verified voltage-drop coefficient for your selected cable. Include any upstream voltage drop and choose a percentage budget to compare against. Features: • Single-phase radial and balanced three-phase radial calculations. • Results in volts and as a percentage of nominal voltage. • Comparison against your chosen voltage-drop budget. • Clear calculation steps, assumptions and limitations. • An illustrative example to help you explore the tool. • Links to further information from Elec Training. Calculations run locally within the extension. No account is required. The extension does not collect or transmit your inputs, browsing history or analytics. Inputs are cleared when the popup closes. This is an educational voltage-drop calculator, not a complete cable-sizing tool. Cable size and temperature document the coefficient you supply; they do not automatically select or correct it. The tool does not assess current-carrying capacity, fault protection, disconnection times or overall installation compliance. A result within your chosen budget does not establish BS 7671 compliance. Disclaimer – Professional Electrical Advice This tool is provided by Elec Training for educational and general guidance purposes only. Results and information should not be treated as a substitute for professional electrical advice, inspection or assessment. Always seek advice from a suitably qualified and competent electrician before carrying out electrical installation, testing, maintenance or design work. All electrical work must comply with the latest applicable UK regulations, standards and safety requirements. Elec Training accepts no responsibility for decisions or work undertaken solely on the basis of information generated by this tool. Learn more: https://elec.training/