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Energy Calculators

Generator Fuel Consumption Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
kW
L/kWh
hours
Verified formula Private

Fuel consumed

15.00

Fuel per hour
1.50

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Generator Fuel Consumption Calculator

The Generator Fuel Consumption Calculator works out your fuel consumed, along with 1 related figure in an instant. Enter load, fuel use per kwh and run time and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the load.
  2. Enter the fuel use per kwh.
  3. Enter the run time.
  4. Read off your fuel consumed, together with fuel per hour — the calculator updates automatically, with no button to press.

Formula

The Generator Fuel Consumption Calculator uses the formula:

Fuel consumed = Load × Fuel use per kWh × Run time

Worked example

For example, with load of 5 kW, fuel use per kwh of 0.3 L/kWh and run time of 10 hours, the fuel consumed is 15.00.

Inputs used
Load 5 kW
Fuel use per kWh 0.3 L/kWh
Run time 10 hours
Results
Fuel consumed 15.00
Fuel per hour 1.50

Results are estimates for educational use, not professional advice.

Frequently asked questions

Multiply load by fuel use per kWh and by hours. A 5 kW load at 0.3 L/kWh for 10 hours burns 15 litres.

Diesel generators often use about 0.25–0.35 litres per kWh at a good load. Check your unit's data for accuracy.

Yes. Running well below rated load is less efficient per kWh, so the fuel rate rises.

Multiply the per-hour use by the hours you need to run between refuels, then add a safety margin.

The Generator Fuel Consumption Calculator uses the formula: Fuel consumed = Load × Fuel use per kWh × Run time. For example, with load of 5 kW, fuel use per kwh of 0.3 L/kWh and run time of 10 hours, the fuel consumed is 15.00.

Enter the load. Enter the fuel use per kwh. Enter the run time. Read off your fuel consumed, together with fuel per hour — the calculator updates automatically, with no button to press.

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