About GeneratorRuntime.com
One question, answered carefully: how long will my generator run?
GeneratorRuntime.com helps homeowners, RV owners, campers, and anyone preparing for a power outage plan their generator fuel. Enter your generator, your fuel, and what you want to power, and the calculator estimates runtime and how much fuel you'd need for longer outages.
Our approach
- Ranges, not false precision. Fuel use varies between generators, so we show honest ranges.
- Manufacturer data first. If you have your manual's runtime spec, it's used as the baseline.
- Transparent math. Every formula is published on How It Works.
- Safety. Fuel-burning generators must always run outdoors, away from doors, windows, and vents.
What this site is not
Results are planning estimates, not guarantees, and are not a substitute for your generator's instructions or advice from a licensed electrician — especially for connecting a generator to your home's wiring, which requires a transfer switch or interlock installed to code.
The calculator is free and works without an account.