Panel-rated sizing tool
What size
generator
do you need?
Add the appliances you want to run, and get the minimum generator rating in watts, kW, kVA and amps — built for electricians, homeowners, contractors and RV owners across the US.
Required Generator
-- kW
Step 1–3
Build your load list
Search the appliance database or add your own equipment with its exact running and starting watts, then review your recommended generator size in the panel on the right.
Appliance database
Your load list
ApplianceRunning WStarting WQty
No appliances added yet. Search above or add a custom item below.
Add custom appliance
Advanced options
Recommended generator
Total running watts
0 W
Peak starting watts
0 W
Recommended generator size
0 W
0 kW · 0 kVA · 0 A
Portable
Safety margin
25%
Est. fuel use / hr
0.0
gal/hr at ~50% load
Est. runtime on a 5-gallon tank
-- hrs
Reference guide
Generator sizing, explained
Everything behind the numbers above — how the math works, what running and starting watts actually mean, and how to pick the right generator for your home, jobsite or RV.
FAQ
Frequently asked questions
The questions we hear most from homeowners, electricians and RV owners sizing a generator for the first time.
Also on Inverter110
Related calculators
More free tools for planning your electrical system.