GenSizer
Free generator size calculator — find the right wattage for outages, RV and job sites.
Runs locally in your browser — no upload, no trackingBy appliance
Generator Size for a Refrigerator
Find the right generator for a refrigerator. Enter its running and startup watts to see the recommended generator size, with headroom for the compressor surge.
Generator Size for a Well Pump
Find the right generator for a well pump. Enter its running and startup watts to see the recommended generator size, with headroom for the motor surge.
Generator Size for a Central AC
Size a generator for a central air conditioner. Enter its running and startup watts to see the recommended size with surge headroom.
Generator Size for a Sump Pump
Find the right generator for a sump pump. Enter its running and startup watts to see the recommended generator size, with headroom for the motor surge.
Generator Size for a Furnace
Size a generator for a furnace blower. Enter its running and startup watts to see the recommended size with surge headroom.