Petrol Price Impact Calculator
When the petrol price changes, find out exactly what it costs you: enter the old and new price per litre and how many litres you use each month.
Results
Extra monthly cost = (new price - old price) x monthly litres. Annual cost = monthly cost x 12. Prices shown without a currency symbol so the tool works for any currency.
How to use
- Enter the old petrol price per litre and the new price per litre (check your local fuel station notice for the latest rate).
- Enter how many litres you use in a typical month — check a few recent receipts if you are not sure.
- Press Calculate to see the extra monthly and annual cost, the percentage rise and your new monthly fuel budget.
Ways to cut the extra cost
- Keep tyres at the recommended pressure — under-inflated tyres burn noticeably more fuel.
- Combine short trips into one drive and avoid idling the engine while parked.
- Smooth driving at a steady speed uses far less fuel than quick starts and hard braking.
- Regular servicing (air filter, engine oil, spark plugs) keeps fuel consumption close to the factory figure.
Frequently Asked Questions (FAQ)
What does the Petrol Price Impact Calculator do?
It takes the old and new petrol price per litre plus your monthly fuel use in litres, then shows the extra monthly and annual cost, the percentage price increase, and your new monthly fuel budget.
How is the extra fuel cost calculated?
The price difference per litre is multiplied by your monthly litres to get the extra monthly cost, which is multiplied by 12 for the extra annual cost. The percentage rise is the price difference divided by the old price, times 100.
What if the new petrol price is lower than the old price?
The calculator still works and shows your monthly and annual savings instead of an extra cost, with the percentage shown as a decrease.
Is the petrol price impact calculator free?
Yes, the calculator is completely free to use with no signup, and all calculations happen in your browser.