Fuel Cost Calculator
Calculate fuel cost for your journey based on distance, fuel efficiency, and fuel price.
About this calculator
Enter the trip distance, your vehicle's mileage and the fuel price to get litres needed, total cost and cost per km. Use trips = 2 for a round trip.
Plan road trips and compare vehicles with real numbers.
How to use it
- Enter distance, mileage and price.
- Set number of trips.
- Press Calculate Fuel Cost.
The formula
Fuel used = distance ÷ mileage (km per litre). Cost = fuel used × price per litre. For 100 km at 20 km/L and ₹100 per litre: 100 ÷ 20 = 5 L, 5 × 100 = ₹500, or ₹5 per km. Real mileage is usually 10 to 25% below the showroom figure, especially in city traffic, with the AC on, or with a full load.
Worked example
100 km trip at 20 km/L, ₹100 per litre
| Fuel needed | 5 litres |
| Cost | ₹500 |
| Cost per km | ₹5 |
| Round trip (×2) | ₹1,000 |
Tips and common mistakes
- Use your real mileage, measured by full-tank to full-tank, not the brochure number.
- Keep tyres inflated to the recommended pressure.
- Smooth driving can save 10 to 15%.
- AC adds 5 to 10% to fuel use.
- Compare CNG, petrol and diesel per km, not per litre.
Frequently asked questions
How do I calculate fuel cost?
Distance ÷ mileage × fuel price.
How do I measure my mileage?
Fill the tank, reset the trip meter, drive, refill and divide km by litres.
Why is my mileage lower than advertised?
Traffic, AC, load and driving style.
Is CNG cheaper per km?
Usually, depending on the local price.
How do I include tolls?
Add them to the total separately.
Is it free?
Yes.