Generator Size Calculator
Add up the running and starting watts of what you want to power in an outage to choose the right portable or standby generator.
Result
Uses typical wattages. Check the label on your appliances, and have an electrician install a transfer switch before connecting a generator to your house wiring.
Generator size to look for
6,000W
- Running watts
- 3,325W
- Peak with the biggest motor starting
- 4,825W
What you picked
Refrigerator: 700 W running, 2,200 W starting, Sump pump (1/2 hp): 1,050 W running, 2,150 W starting, Furnace fan (1/2 hp): 875 W running, 2,350 W starting, Lights (LED, whole house): 300 W running, 300 W starting, TV, router and laptop: 400 W running, 400 W starting