How the Fuel Cost Calculator works
Estimate fuel cost for regular driving. Adjust the inputs above, then use the calculate button to generate a fresh estimate based on the numbers you entered.
The result is designed to give you a quick planning number, plus a short breakdown of the major figures behind it. You can reset the form at any time and try a different scenario.
When to use this calculator
Use this fuel cost calculator to estimate weekly, monthly and annual fuel spending for regular driving. It is helpful for budgeting commuting costs or comparing vehicles with different fuel economy.
Formula
Weekly fuel cost = weekly distance x fuel economy / 100 x fuel price
- Weekly distance is the number of kilometres driven per week.
- Fuel economy is litres used per 100 kilometres.
- Fuel price is the cost per litre.
Worked example
For 300 km per week, 8.5 L/100 km fuel economy and $1.65 per litre, the calculator estimates weekly, monthly and annual fuel costs.
Common mistakes
- Using highway fuel economy for mostly city driving.
- Forgetting seasonal fuel price changes.
- Ignoring extra driving for errands, school or weekend trips.
FAQs
Can I use miles instead of kilometres?
This calculator is set up for kilometres and litres per 100 km. Convert inputs first if needed.
Why is monthly cost estimated from weekly driving?
Weekly cost is scaled to an average month for budgeting.
Does driving style matter?
Yes. Speed, traffic, weather and driving habits can affect actual fuel use.