Generator Size Calculator

Tick everything you want to run at the same time. We’ll add up the watts and show the models we list that can handle it.

Household
Job site
Camping & RV

How it works

Running watts are the total of everything you tick. Some appliances need a burst of extra power to start, so starting watts are that total plus the single biggest starting figure. A generator needs to cover both numbers.

The appliance figures are typical values from Champion Power Equipment’s wattage chart, and the generator figures are each manufacturer’s published specs. Your own appliances may use more or less, so check the label on each one. It’s sensible to leave some headroom.

Safety: never run a fuel generator indoors or in a garage, and have a licensed electrician install a transfer switch before connecting any generator to your home’s wiring.