Fuel Cost Calculator
Total fuel cost for a trip comes down to distance, how efficiently the vehicle uses fuel, and the price per litre — three numbers that answer 'can I afford this drive' before setting off.
Inputs
Result
2,625
25 litres required
How the fuel cost calculator works
Litres required = distance ÷ fuel efficiency (km per litre).
Total cost = litres required × price per litre.
Worked example: 450 km trip, 18 km/l efficiency, price 105 per litre
- Litres = 450 ÷ 18 = 25 litres.
- Cost = 25 × 105 = 2,625.
Common mistakes to avoid
Using a manufacturer's rated fuel efficiency instead of real-world figures
Official efficiency ratings are typically measured under ideal test conditions — real-world driving (traffic, air conditioning, terrain, driving style) usually returns noticeably worse efficiency than the rated figure.
Forgetting the round trip
If the distance entered is one-way but the actual trip is a round trip, the true fuel cost is double this calculation's result — always confirm whether 'distance' means one-way or return.
Frequently asked questions
How do I find my vehicle's real-world fuel efficiency?
Track the litres used to refill a full tank against the distance driven since the last fill-up — dividing distance by litres gives a real, personal efficiency figure more accurate than a manufacturer's rating.
Does this account for fuel price changes during a long trip?
No — it assumes one constant fuel price throughout. For a trip crossing regions with notably different fuel prices, calculate each leg separately with its local price for accuracy.
How does driving style affect the number this calculator gives?
Aggressive acceleration, high speeds, and heavy air-conditioning use all reduce real fuel efficiency below typical rated figures — adjust the efficiency input downward for a more realistic estimate under those conditions.
Can this be used for electric vehicles?
Not directly — EVs use energy consumption (like kWh per 100 km) and electricity price rather than litres and fuel price, which needs a different calculation entirely.
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