Extension Cord Gauge Chart

Garage Setup Hub · garagesetuphub.com · reviewed September 13, 2026

Minimum cord gauge by amps and length
Up to 10 amps, 25 ft	16 AWG
Up to 10 amps, 50 ft	14 AWG
Up to 10 amps, 100 ft	12 AWG
10-15 amps, 25 ft	14 AWG
10-15 amps, 50 ft	12 AWG
10-15 amps, 100 ft	10 AWG
Rule of thumb	Double the length, go one gauge thicker
Label 12/3	12 AWG wire, 3 conductors with ground

Typical values for general guidance. Always check the manufacturer's specification for your exact product.

Share or embed this chart

You are welcome to use this chart on your blog, forum or class handout. Please keep the credit link.

Embed code

<a href="https://garagesetuphub.com/blog/extension-cord-gauge-chart"><img src="https://garagesetuphub.com/charts/extension-cord-gauge-chart/image.png" alt="Extension Cord Gauge Chart" width="1200" style="max-width:100%;height:auto"></a>
<p>Source: <a href="https://garagesetuphub.com/blog/extension-cord-gauge-chart">Extension Cord Gauge Chart</a> by <a href="https://garagesetuphub.com/">Garage Setup Hub</a></p>

Read the full guide behind this chart →