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.
Where the data comes from
Generator specifications and published runtimes in our generator database come from each manufacturer's own product pages and owner's manuals. We do not use third-party runtime claims. When a manufacturer's documents disagree, we note the conflict on the model's page and say which figure we used and why.
We do not physically test generators. Published runtimes are the manufacturer's figures, not our own measurements. Anything that goes beyond a published figure — a different load, a different amount of fuel — is labeled as a calculated estimate. Where a manufacturer doesn't publish something (for example, a propane runtime or the size of the propane tank used), we say so rather than guess.
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 calculators are free and work without an account.
Who runs this site
GeneratorRuntime.com is part of the Really Useful Pages network, an independent collection of practical online calculators, research tools, and informational resources. Our goal is to provide free, accessible tools that help people solve everyday problems. For questions, corrections, or suggestions, contact us at feedback@reallyusefulpages.com.