Generator fuel consumption calculator

Use this calculator when the job question is fuel use: how many litres a generator record may consume across an entered run period, and what simple fuel cost follows from an entered fuel price. It is useful for backup run logs, temporary supply notes, shift planning, fuel logistics and operating-cost records.

The calculation is deliberately narrow. The page does not select a generator, estimate emissions, model fuel storage or reproduce manufacturer fuel curves. It takes the fuel rate that the user enters and keeps that assumption visible beside load, run time, generated kWh and optional cost.

Generator Fuel Use Cases

A strong record names the generator or operating scenario. A generic note such as "generator fuel" is weaker than "GEN-FUEL-1, 45 kW, 12 L/h, 8 h, 96 L" because another reviewer can trace the load and fuel-rate basis.

Fuel Record Boundary

This boundary matters because fuel figures are often copied into operations, tenders and logistics notes. The calculator is useful when the source of the fuel-rate value is visible; it is weak when the rate is guessed or copied from a different generator and load condition.

Input Checklist

If the fuel-rate value comes from a manufacturer curve, check that it belongs to the load condition being entered. If the actual operating load varies materially, use separate records or a stronger operating log rather than hiding the variation inside one average.

Review Workflow

1. Name the generator, site run, backup scenario or operating log.
2. Enter the average generator load in kW for the period being recorded.
3. Enter the fuel rate in litres per hour from a suitable source.
4. Enter the run time represented by the record.
5. Enter fuel cost as 0 if the record only needs litres and kWh.
6. Read fuel used before using the cost output.
7. Compare litres per kWh with the fuel-rate source and load basis.
8. If the run period is long, check duty, refuelling and site operating assumptions.
9. Keep product curves, fuel storage and local requirements outside this arithmetic page.
10. Use the runtime calculator when fuel capacity rather than run period is the starting point.

The workflow keeps a fuel-use record separate from generator selection and operating policy. A tidy arithmetic result does not mean the generator, fuel system or site plan has been reviewed.

Worked Records

Australian Context

Generator fuel-use records in Australia often sit beside 230/400 V, 50 Hz backup supply, temporary supply or standby power notes. The electrical load may come from a switchboard schedule, generator load worksheet or operating log. The fuel-use result does not decide generator suitability, fuel storage, emissions, changeover equipment, earthing or protection.

When the fuel record feeds an equipment decision, check the generator manufacturer data, fuel type, local authority expectations, site fuel-storage rules and project requirements separately. Keep the calculator output as a transparent worksheet record.

Stop Points

• Fuel rate is unknown or copied from a different generator/load condition.
• Load varies materially across the operating period.
• Fuel price is being treated as whole-of-operation cost.
• The result is being used for fuel storage, refuelling or generator selection decisions.
• Manufacturer, authority or project requirements provide a different basis.