Power Strip Load Calculator – Check If Your Devices Safely Fit on the Power Strip
The power strip load calculator computes the total power of all devices connected to a power strip and checks if it exceeds the safe load limit. Prevents overloading and fire risk.
Enter device wattages or amperage, and the calculator computes total power and compares it to the power strip's rated capacity (typically 15-20 A / 1,800-2,400 W in the US). You'll clearly see if the combination is safe.
How Many Devices Can You Connect to One Power Strip?
US outlets are typically 120V / 15-20A, so the theoretical maximum is 1,800-2,400W. However, it's recommended to stay below 80% capacity, or under 1,440-1,920W. High-wattage appliances (oven, washing machine, space heater) should be plugged directly into wall outlets, not power strips.
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Browse all tools →The power strip load calculator helps check whether your extension cord can handle the combined power of connected devices. An important safety tool for preventing overload and fire risks.
Enter the power strip's capacity and the power consumption of connected devices, and the calculator shows the total load with warnings if limits are exceeded.
- Calculate the combined power consumption of multiple devices in watts.
- Compare the load to the power strip's maximum capacity.
- See clearly whether the load is at a safe level or overloaded.
The power strip's rated capacity must not be exceeded – preferably leave a 10-20% safety margin.
- Power strip capacity is usually specified in watts or amperes.
- Motorized devices (vacuum cleaners, microwaves) can cause startup surges.
- Daisy-chained power strips multiply safety risks.
An overloaded power strip is a common cause of fires – never exceed the rated capacity.
- Never daisy-chain power strips – use a longer cord if needed.
- A damaged power strip must not be used – replace it with a new one.
- CE-marked power strips and fuse protection increase safety.