Fuel Cost Calculator – Calculate Trip Fuel Cost Instantly
Check your vehicle manual or use average city mileage.
Calculate the total fuel cost for any trip in seconds. Enter your trip distance, vehicle mileage, and fuel price — or use the Petrol, Diesel, or CNG preset buttons. Get total fuel cost, litres required, and cost per km instantly.
How to Calculate Fuel Cost
Fuel Required = Distance (km) ÷ Mileage (km/L)
Total Cost = Fuel Required × Fuel Price (₹/L)
Cost per km = Fuel Price ÷ Mileage
Example: 300 km trip, 15 km/L mileage, petrol at ₹106/L:
Fuel = 300/15 = 20 litres • Cost = 20 × ₹106 = ₹2,120• Cost/km = ₹7.07
Petrol vs Diesel vs CNG — Running Cost Comparison
| Fuel Type | Approx Price | Typical Mileage | Cost per km |
|---|---|---|---|
| Petrol | ₹106/L | 15–20 km/L | ₹5.3–₹7.1 |
| Diesel | ₹92/L | 18–25 km/L | ₹3.7–₹5.1 |
| CNG | ₹76/kg | 20–28 km/kg | ₹2.7–₹3.8 |
Prices are approximate for major Indian cities as of 2025. Actual prices vary by city.
Tips to Improve Fuel Efficiency
- Maintain steady speed — avoid rapid acceleration and hard braking. Ideal speed for fuel efficiency is 60–80 km/h on highways.
- Check tyre pressure — under-inflated tyres increase rolling resistance and reduce mileage by 2–3%.
- Regular servicing — clean air filters, fresh engine oil, and properly gapped spark plugs can improve mileage by 5–10%.
- Reduce AC usage — air conditioning increases fuel consumption by 8–15%. At speeds below 60 km/h, open windows are more efficient.
- Avoid idling — switch off the engine when stopped for more than 30–60 seconds.
- Reduce vehicle weight — every 100 kg of extra weight reduces mileage by approximately 2%.
Frequently Asked Questions
How do I calculate fuel cost for a trip?
Fuel Required = Distance / Mileage (km/L). Cost = Fuel Required × Fuel Price/L. For a 200 km trip at 15 km/L with petrol at ₹106/L: Fuel = 13.33L, Cost = ₹1,413.
What is the current petrol price in India?
As of mid-2025, petrol is approximately ₹103–₹108/L in major cities, diesel ₹90–₹94/L, and CNG ₹73–₹79/kg. Use our preset buttons as a starting point and adjust for your city.
What is the average mileage of popular cars in India?
Maruti Swift: ~23 km/L. Hyundai i20: ~20 km/L. Honda City: ~17 km/L. Toyota Fortuner: ~10 km/L. SUVs typically deliver 8–14 km/L. Real-world mileage is 10–20% lower than ARAI-certified figures.
How is fuel efficiency measured?
Fuel efficiency is measured in km per litre (km/L) in India. ARAI certifies official mileage, but real-world mileage is typically 10–20% lower due to driving conditions, traffic, and style.
How can I improve my car's fuel efficiency?
Maintain steady speeds, keep tyre pressure correct, service regularly, use AC sparingly, avoid idling, and reduce vehicle weight. Highway driving typically gives better mileage than city driving.
Is CNG cheaper than petrol for the same distance?
Yes, significantly. At ₹76/kg with 22 km/kg, CNG costs ~₹3.5/km vs ₹7/km for petrol at ₹106/L with 15 km/L mileage. The savings over long distances are substantial.
How do I calculate cost per kilometre?
Cost per km = Fuel Price per litre ÷ Mileage (km/L). For ₹106/L petrol at 15 km/L: ₹106 / 15 = ₹7.07/km in fuel costs alone.
How do I compare petrol, diesel, and CNG costs?
Enter the same trip distance with each fuel type's price and your vehicle's mileage for that fuel type. Diesel engines typically achieve better mileage than petrol, so savings are higher than the price difference alone suggests.
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