Fridge. Well pump. Furnace fan. That stack decides whether you bought a generator or an expensive night-light.
Most sizing posts add every appliance in the house. Motors do not all start at once. Only the biggest surge counts on top of everything already running. Then apply the headroom you set on the calculator.
This sheet does not reprint an unsourced house table. Honda and Champion rows are on the generator sizing chart. Enter the same nameplates in the calculator.
Which loads you keep on decides the class. A transfer switch is how that class reaches the panel. The watt ceiling for a 30 A or 50 A switch, shown as amps times 240 V, is on the transfer-switch guide. Back-feeding a dryer outlet is how people kill linemen.
The outage order — closed fridge, then a generator outside — is on how to use a generator when the power goes out.
Method context (not a design stamp):
Yes — free to use, no signup, no email required.
Estimates follow industry-standard sizing rules and common safety margins. Always confirm with a licensed professional for final sizing.
Yes — the page is fully responsive and works on phones, tablets, and desktop.
Formulas are shown inline on the result panel so you can verify each step yourself.