Generator Size Calculator
Size a standby generator from your appliances' running and starting watts, free online.
About this calculator
Add the running watts of everything you want to power at once, then add the single largest starting surge (motors and compressors start at 2–3× running watts). Add 20% headroom. kVA = kW ÷ 0.8 (typical power factor). Enter each appliance as "name: running watts, starting watts".