Generator Fuel Cost Calculator
Estimate generator fuel volume and cost from its stated hourly burn rate.
Result
Estimated total fuel cost: $26.25Estimate
Actual burn rate changes with load, model, fuel, temperature and maintenance. This calculator does not size a generator or assess electrical safety. Never run a portable generator indoors or in a garage, basement, crawlspace, shed or porch.
- Estimated total fuel
- 7.5 galEstimate
- Total operating hours
- 10Estimate
- Estimated fuel cost per operating hour
- $2.63Estimate
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Results are estimates based on the ratings, usage and prices you enter. Actual consumption, losses, tariffs and equipment performance vary. Check your bill, meter and manufacturer information before relying on the result. Read the full disclaimer
How to use the Generator Fuel Cost Calculator
- Find the manufacturer-stated fuel use per hour at the load you expect to operate, and select whether that figure is in US gallons or litres.
- Enter hours per run, the number of runs and a fuel price in the same volume unit as the burn rate.
- Review total operating time, fuel volume, total fuel cost and cost per operating hour.
Extend a stated burn rate over operating time
This calculator deliberately begins with the manufacturer’s fuel-consumption figure at the intended load. It does not guess fuel use from generator watts.
operating hours = hours per run × number of runstotal fuel = fuel per hour × operating hourstotal cost = total fuel × price per gallon or litreThe selected burn-rate unit and fuel-price unit must match. Results assume the hourly rate stays constant for every entered run.
Portable-generator safety
Fuel cost is not a safety or installation assessment. The U.S. Consumer Product Safety Commission warns that generator exhaust contains deadly carbon monoxide: never operate a portable generator indoors or in a garage, basement, crawlspace, shed or porch. Operate it outside at least 20 feet from the home with exhaust directed away, follow the manufacturer’s instructions, and use working carbon-monoxide alarms.
Never connect a generator to household wiring by plugging it into a wall outlet. Generator selection, transfer equipment and wiring require the manufacturer’s instructions, local rules and qualified electrical guidance.
With your numbers
- Operating time = 10 hours × 1 runs = 10 hours
- Fuel = 0.75 gal/h × operating time = 7.5 gal
- Fuel cost = total fuel × $3.50 per gallon = $26.25
Quick reference
Actual burn rate changes with load, model, fuel, temperature and maintenance. This calculator does not size a generator or assess electrical safety. Never run a portable generator indoors or in a garage, basement, crawlspace, shed or porch.
| Example | Estimated total fuel cost |
|---|---|
| 0.75 gal/h for 10 hours | $26.25 |
| 0.5 gal/h for three 8-hour runs | $48.00 |
| 1.2 gal/h for 24 hours | $93.60 |
| 2.8 L/h for 10 hours | €44.80 |
| 1.5 L/h for two 6-hour runs | €32.40 |
| 4 L/h for 20 hours | €112.00 |
Common questions about the Generator Fuel Cost Calculator
- Can I calculate fuel use from the generator watt rating?
- No. Fuel consumption varies by model, engine, fuel and load. Use a consumption table or figure from the manufacturer for the operating load you expect.
- Can I use this for gasoline, diesel or propane?
- Yes when the manufacturer gives a liquid-volume burn rate and your price uses the same gallon or litre basis. Do not mix mass, cubic-foot or other pricing units with this calculator.
- Why might actual fuel use differ?
- Load changes, idle periods, temperature, altitude, maintenance and fuel condition can all change consumption. The result holds the entered hourly rate constant.
- Does this calculator tell me how to install or connect a generator?
- No. It does not size equipment or assess placement, wiring, transfer equipment or ventilation. Follow the manufacturer, local requirements and qualified electrical guidance.