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Generator Fuel

Estimate fuel burned and cost of running a generator daily.

About Generator Fuel

The hourly fuel burn is multiplied by run hours for total gallons, and the daily cost follows from multiplying by fuel price. Backup power burns fuel fast, so knowing daily consumption tells you how long supplies last and what an outage really costs.

Formula

Generator Fuel

Gallons = usage per hour x hours; cost = gallons x price

gallons per hour
Fuel burn rate at the generator's typical load

Worked example

With the default values below, Generator Fuel returns Gallons per Day of 12.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Usageminimum 0 gal/h
1.5 gal/h
Hours per dayminimum 0
8
Fuel priceminimum 0
3.5

Results

Gallons per Day
12.00 gal
Cost per Day
$42.00
Cost per Month
$1,260.00

Step by step

  1. 1Values used
  2. 2Generator Fuel
  3. 3Gallons per Day= 12.00 gal
  4. 4Cost per Day= 42.00
  5. 5Cost per Month= 1,260.00

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Generator Fuel calculated?

Gallons = usage per hour x hours; cost = gallons x price The hourly fuel burn is multiplied by run hours for total gallons, and the daily cost follows from multiplying by fuel price.

Why does Generator Fuel matter?

Backup power burns fuel fast, so knowing daily consumption tells you how long supplies last and what an outage really costs.

What values do I need to enter?

This calculator takes 3 inputs: Usage, Hours per day, Fuel price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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Generator Fuel – Calculate Gallons per Day & Cost per Day