Extension Cord Size Calculator — Free Online Calculator
Find the right extension cord gauge for your power tools. Enter wattage and cord length for a safe recommendation.
How to Use This Calculator
Enter the tool wattage from its nameplate, select cord length and voltage.
The Formula Explained
Extension cord sizing is based on both amperage and distance. Longer cords need thicker gauges to prevent excessive voltage drop, which can damage motors and overheat the cord.