A single 100-foot cord is better.

Daisy-chaining two 50-foot cords works in a pinch, but it’s not ideal. Each connection adds resistance, and more resistance means voltage drop — your tool or appliance gets less power, runs weaker, and could overheat.

The bigger issue is the extra connection points. Every plug-to-receptacle junction is a potential failure point: looser fit, moisture ingress, tripping hazard. If you’re running something heavy like a table saw or space heater, that extra resistance can cause the cords to get warm or even melt the plugs.

Get one continuous 100-foot cord instead. You’ll have fewer failure points, less voltage drop, and one less thing to think about. Worth the extra few bucks.