What do you want to power?
This tool will focus on determining your running and starting watt needs. The size of the generator you need depends on your power requirements. Generally, a higher-wattage generator lets you power more items at once. Follow the steps below to help you determine how powerful your portable generator should be.
- Fill in the quantity, running watts and starting watts of the items you wish to power at the same time.
- Press "CALCULATE" button.
Note: The below are estimates only. Check your tool or appliance for exact wattage requirements. The wattages listed in our tool are based on estimated wattage requirements. For exact wattages, check the data plate or owner’s manual on the item you wish to power
Your power needs
Please consider the output of this program to be an approximation.
Frequently asked questions
What is the difference between running watts and starting watts?
Running, or rated watts are the continuous watts needed to keep items running. Starting watts are extra watts needed for two to three seconds to start motor-driven products like a refrigerator or circular saw, this is the maximum wattage the generator can produce.
What if I can’t determine the running or the startingwatt requirement for a tool or appliance?
If the running watts are not on the tool or appliance, you may estimate using the following equation: WATTS=VOLTS x AMPS. Only motordriven items will require starting watts. The starting watts required may be estimated at 1-2x the running/rated watts.
Why is only one starting watt item used to calculate your total starting watt requirement?
Unlike running watts, starting watts are only needed during the first few seconds of operation. In most cases, only one item will start or cycle at the same time, therefore this is the most accurate estimate.