What this result means
This estimates fuel cash outflow for a generator based on its average consumption and your usage pattern.
How the Generator Fuel Cost Calculator works
This excludes maintenance, oil, repairs, and generator depreciation.
The calculator does not fetch live prices or rates. That is intentional: you provide the tariff, price, rate or cost that actually applies to your situation, which makes the assumptions visible and avoids presenting stale market data as current.
How to get a more useful estimate
- Measure fuel use at the load level you normally run; consumption changes with generator size and load.
- Model separate weekday and weekend scenarios if operating hours differ.
- Add maintenance, oil, filters, repairs, and depreciation when comparing generator power with grid or solar power.
Scenario check
Fuel consumption should match the load you normally place on the generator. A liters-per-hour figure measured at light load can understate cost during heavy use. After estimating fuel expense, add oil, filters, servicing, repairs and equipment depreciation separately if you are comparing generator power with grid electricity, batteries or solar.
Important limitations
- Maintenance and capital cost are excluded.
- Fuel consumption can rise with poor maintenance or high load.
- Fuel price volatility is not forecast.
Frequently asked questions
Why does generator load matter?
Generators consume different amounts of fuel at different loads, so a liters-per-hour figure from your normal operating condition is better than a generic rating.
Does this include diesel and petrol?
Yes. The mathematics is the same as long as you enter the correct liters-per-hour consumption and price per liter.
Can I compare generator cost with grid electricity?
Yes, but convert both to comparable energy or monthly cash-flow assumptions and remember to include generator maintenance and capital costs separately.