How to Use the Power Strip Wattage Checker
Plugging several devices into one power strip is convenient, but if the combined load exceeds the strip's rated capacity, the internal wiring can overheat and start a fire. This calculator takes your power strip's rated amperage and the total wattage of connected devices, then calculates your usage rate against the safe limit.
Most household circuits in the US are rated at 15A or 20A. At 120V, a 15A circuit supports up to 1,800W and a 20A circuit up to 2,400W — but that's the absolute maximum, not a safe working limit.
Space heaters, microwaves, hair dryers, and toasters often draw 800-1,500W each, so combining just a couple of them can push a strip close to its limit fast. Standard guidance for continuous loads is to stay at or below 80% of the rated capacity. If your usage rate is above 80%, spread devices across separate outlets or move high-draw appliances to a dedicated circuit.
Frequently Asked Questions
Exceeding the rated wattage causes internal wiring to overheat, which can lead to a fire. Avoid plugging high-wattage items like space heaters, microwaves, or hair dryers into the same strip.
Running a strip at its full rated capacity keeps the wiring hot continuously. Standard practice for continuous loads is to stay at or below 80% of the rated amperage for safety.