Electrical planning

Estimate a practical wire size from current, length, and allowable voltage drop

This calculator uses a simple voltage-drop approach and rounds up to a common cable size. Treat the result as a planning estimate and confirm with installation standards before final use.

Cable Inputs

Provide one-way cable length, current, material, and the allowed voltage drop target.

Current (A)

One-way Length (m)

System Voltage (V)

Allowed Voltage Drop (%)

Conductor Material

This output is a planning estimate. Cable installation method, ambient temperature, bundling, and local code can all change the final requirement.

Sizing Summary

Calculated minimum0 mm²

Recommended standard size0 mm²

Estimated voltage drop0 V

Estimated ampacity check-