basic

Generator Fuel Runtime Calculator

Hours = tank gallons / consumption rate.

Estimate how many hours a portable generator will run on a full tank, given the tank size in gallons and the fuel-consumption rate (gph) at the chosen load.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

gal
gal/hr

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Runtime (hr) = tank_gal / consumption_gph

In depth

Estimate how many hours a portable generator will run on a full tank, given the tank size in gallons and the fuel-consumption rate (gph) at the chosen load.