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Diesel vs Petrol Generator Cost Calculator

Compare the long-term running costs of diesel versus petrol generators.

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Formula

Monthly Cost = (Daily Consumption × Fuel Price) × 30

Calculates specific fuel costs for both fuel types to help you decide which generator is more economical for your usage.

Worked Example

Running a diesel generator for 5hrs a day costs less in fuel than a petrol one, despite the higher purchase price.

Diesel vs Petrol Economics

The "right" choice depends on how many hours you intend to run the unit.
  • Diesel wins for high-hour industrial or backup use.
  • Petrol generators are often lighter and quieter for recreational use.
  • Initial purchase price for diesel is usually higher.

Calculate your expected usage hours before making a purchase.

You can also calculate changes using our Generator Running Cost Calculator or Diesel Consumption Calculator.

Frequently Asked Questions

Which fuel is more energy dense?

Diesel has more energy per litre, making diesel engines generally more fuel-efficient.

What about maintenance?

Diesel engines are often more complex and can be more expensive to repair, but tend to last longer.

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