Wattstanding

Calculator

Generator fuel runtime and cost calculator

Enter the tank size and the maker's stated runtime at your expected load, then how long and how often you will run it. You supply the fuel price.

Choosing one fills tank and runtime from its listing
Use the maker's figure for the load you expect
Enter today's price — we never assume one
Wattstanding calculationGallons per hour = tank ÷ stated runtime. Outage fuel = gallons per hour × hours per day × days. Cost = gallons × the price you enter.
SafetyStore fuel only in approved containers, outdoors or in a detached space, away from ignition sources and living areas, and follow local rules on quantities. Never refuel a hot or running generator.