24V Wire Size Calculator
Preset to 24 V. Adjust load, run length, drop %, and material.
How to Use This Calculator
Optimized for 24 V DC systems. Enter the load, one-way length, allowable drop %, and material. The tool computes the minimum cross-sectional area to meet your drop target.
Formula
Vdrop = I · R = I · (ρ · 2L / A)
A ≥ ρ · 2L · I / Vdrop,allow
Frequently Asked Questions
What drop % is typical for 24 V?
3% is a common design goal; use stricter targets for sensitive devices.