Generator size calculator
Pick everything in your home that has to run during an outage. Mark what can take turns — it often drops you a whole generator class.
Quick start
CIRCUIT 01
Kitchen
2 selectedRefrigerator
700 W run · 2,900 W start · 120 V
Chest freezer
500 W run · 1,500 W start · 120 V
Upright freezer
700 W run · 2,900 W start · 120 V
Microwave (1,000 W)
1,000 W run · 1,000 W start · 120 V
Coffee maker
1,300 W run · 1,300 W start · 120 V
Toaster
1,100 W run · 1,100 W start · 120 V
Slow cooker
250 W run · 250 W start · 120 V
Dishwasher
1,500 W run · 1,500 W start · 120 V
Electric stove, 8-inch burner
2,100 W run · 2,100 W start · 240 V
CIRCUIT 02
Heating & Cooling
1 selectedFurnace fan (1/2 HP)
875 W run · 3,150 W start · 120 V
Furnace fan (1/3 HP)
700 W run · 2,100 W start · 120 V
Window AC (10,000 BTU)
1,200 W run · 2,200 W start · 120 V
Window AC (12,000 BTU)
1,700 W run · 4,200 W start · 120 V
Central AC (3 ton)
3,500 W run · 10,500 W start · 240 V
Heat pump
4,700 W run · 9,200 W start · 240 V
Space heater
1,500 W run · 1,500 W start · 120 V
Dehumidifier
650 W run · 1,950 W start · 120 V
Box fan
150 W run · 300 W start · 120 V
Ceiling fan
75 W run · 75 W start · 120 V
CIRCUIT 03
Water
1 selectedSump pump (1/2 HP)
1,050 W run · 2,700 W start · 120 V
Sump pump (1/3 HP)
800 W run · 2,100 W start · 120 V
Well pump (1/2 HP)
1,000 W run · 2,550 W start · 240 V
Well pump (1 HP)
2,000 W run · 6,000 W start · 240 V
Electric water heater
3,900 W run · 3,900 W start · 240 V
CIRCUIT 04
Laundry
Washing machine
1,150 W run · 2,800 W start · 120 V
Electric dryer
5,500 W run · 6,400 W start · 240 V
Gas dryer
700 W run · 2,100 W start · 120 V
CIRCUIT 05
Everyday
2 selectedLED lights (10 bulbs)
100 W run · 100 W start · 120 V
TV (LED 55")
150 W run · 150 W start · 120 V
Wi-Fi router + modem
20 W run · 20 W start · 120 V
Laptop
150 W run · 150 W start · 120 V
Desktop computer + monitor
800 W run · 800 W start · 120 V
Phone chargers
25 W run · 25 W start · 120 V
Security system
100 W run · 100 W start · 120 V
Hair dryer
1,500 W run · 1,550 W start · 120 V
Garage door opener (1/2 HP)
700 W run · 1,450 W start · 120 V
CIRCUIT 06
Medical
CPAP (with heated humidifier)
120 W run · 120 W start · 120 V
Oxygen concentrator (5 LPM)
350 W run · 1,050 W start · 120 V
EV charger (7 kW+)
Not counted — we’ll explain why in your result.