Generator Size Calculator
Find the right generator size for residential or commercial loads.
Add each load below. Motors require 3–6× rated current at start-up.
W
W
W
W
PF
%
Generator Recommendation
Formulas
- kVA running = Total watts × surge factor / (PF × 1000)
- kVA sized = kVA running × (1 + margin%/100)
- Standard generator sizes: 3.5, 5, 7.5, 10, 14, 20, 25, 30, 40, 60, 80, 100 kVA