Why Check Power Strip Overload Ahead of Time
Plugging several devices into one power strip adds up their combined draw, putting a strain on the strip's internal wiring. Most household power strips in the US are rated around 15A, roughly 1,800W, and running several high-draw appliances at once — space heaters, microwaves, hair dryers — can easily push past that limit.
This calculator sums the wattage of each device you plug in and compares the total against your power strip's rated capacity, flagging whether you're safe, approaching the limit, or already overloaded. Leave unused device fields blank and they're automatically treated as 0W, so you only need to fill in what's actually plugged in. The estimated monthly cost also helps you understand your usage pattern.
Running a strip above its rated capacity for extended periods can overheat the wiring and start a fire, so if the calculator flags overload risk, move some devices to a different outlet right away. This is worth checking regularly during winter when space heater use rises.
Frequently Asked Questions
Exceeding the rated capacity can overheat the internal wiring and lead to a fire. The risk grows when several high-wattage devices, like space heaters, are plugged in at once.
Most household power strips are rated around 15A, or roughly 1,800W in the US. Check the label on the strip or its packaging for the exact rated current and wattage.
Any blank device field is treated as 0W and excluded from the total. You only need to enter the devices you're actually using.