SpecCalc Hub · High
Wire Size Estimate Calculator
Estimate conductor area from voltage drop only. This is not final cable selection.
Formula
allowed_voltage_drop_v = voltage * max_drop required_area = coefficient * ρ * length * current * PF / allowed_voltage_drop_v recommended_standard_size = first standard size >= required_area
Assumptions
- Inputs are user-provided.
- Results are preliminary estimates.
- Estimate is based only on voltage drop.
Limitations
- Does not check ampacity, protection, installation method, temperature, insulation, local codes, or safety.
Methodology
Solves the simplified voltage-drop equation for conductor area and rounds up to a standard metric size.
This calculator provides an estimate for informational purposes only. It is not a certified engineering design, electrical safety approval, or professional installation recommendation. Always verify final decisions with a qualified professional and applicable local codes.