Generator Fuel Cost Calculator
Estimate generator fuel cost per hour and per day.
Result
Formula
Calculation logicFrequently asked questions
How much fuel does a generator use?
Roughly 0.5 to 0.75 gallons per hour per 5 kW at half load for gasoline portables. Check the load-following curve.
Gasoline vs propane vs diesel?
Diesel sips fuel and lasts longest; propane stores forever but uses more per kWh; gasoline is available but thirsty.
Does load size change fuel use?
Generators are most efficient at 50 to 75 percent load. Oversized units idling at 10 percent waste fuel.
How do I estimate daily cost?
Multiply gallons per hour at your load by hours and local fuel price, then add oil and maintenance.
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