Energy & Appliances

Generator Fuel Cost Calculator

Estimate generator fuel gallons and operating cost from burn rate and runtime.

FreeResult emailed + shownReviewed September 9, 2026
Energy & Appliances
Step 1

Enter your numbers

Method

How this generator fuel cost calculator works

Fuel used equals gallons per hour × runtime. Total fuel cost is gallons used × price per gallon.

How to use it

  1. Fuel burn rate. Enter the value in gal/hour.
  2. Runtime. Enter the value in hours.
  3. Fuel price. Enter the value in $/gal.
  4. Request the result. Add your email, then select “Email & show my result.”

What to do with the number

Generator burn rate changes with load, so manufacturer fuel-consumption tables are better than a single nameplate estimate. If your expected load varies, calculate a low-load and high-load scenario to create a realistic range.

Planning estimate

Use this result as a starting point, not a guarantee. Product specifications, site conditions, manufacturer guidance, local codes, taxes, labor, tolerances, and rounding can change the real requirement or cost.

FAQ

Questions about this calculator

What does the Generator Fuel Cost Calculator calculate?

Estimate generator fuel gallons and operating cost from burn rate and runtime.

What inputs does this generator fuel cost calculator use?

The calculator uses fuel burn rate, runtime, fuel price. You can replace every default with the numbers that match your situation.

How should I use the Generator Fuel Cost Calculator result?

Generator burn rate changes with load, so manufacturer fuel-consumption tables are better than a single nameplate estimate.

What can make the real-world result different?

If your expected load varies, calculate a low-load and high-load scenario to create a realistic range.

Can I change the calculator assumptions?

Yes. The editable inputs are the assumptions. Replace the default values with your own measurements, prices, rates, quantities, or specifications before requesting the result.