DC Wire Size Calculator
Voltage drop sizing for DC circuits
Instructions
Enter current, one-way length, supply voltage, allowable voltage drop %, and conductor material. Click Calculate to get the minimum cross-sectional area.
Formula
A ≥ ρ · 2L · I / Vdrop,allow
Common Questions
Does this include ampacity?
No. This sizes for voltage drop only. Always verify thermal ampacity per code.