Vehicle Fuel Cost Calculator India
Calculate monthly and annual fuel cost for your car or bike. Compare petrol, diesel, and CNG costs.
About this calculator
Pick petrol, diesel, CNG or electric, enter the price, mileage and daily distance, and see your monthly and annual running cost.
Compare fuels to decide between vehicles.
How to use it
- Choose the fuel type.
- Enter price, mileage and daily distance.
- Press Calculate Fuel Cost.
Running cost maths
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.
For electric vehicles, mileage is in km per kWh: cost per km = electricity tariff ÷ km per kWh. At ₹8 per unit and 6 km/kWh, an EV costs about ₹1.33 per km, compared with about ₹6 to 7 per km for a petrol car at 15 km/L and ₹100 per litre.
Worked example
40 km/day, 30 days = 1,200 km a month
| Petrol at ₹103, 15 km/L | 80 L × 103 = ₹8,240 |
| CNG at ₹80 per kg, 22 km/kg | 54.5 kg × 80 = about ₹4,360 |
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.