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Fuel Cost Calculator
Written by Sagar Kumar
Last updated: 21 August 2026
Planning a road trip or daily commute budget? Enter your distance, your vehicle's mileage and the current fuel price to see exactly how much the journey will cost and how many litres you will need.
How to Use This Fuel Cost Calculator
- Enter the trip distance in kilometres.
- Enter your vehicle's mileage (km per litre).
- Enter the current petrol/diesel price per litre and tap Calculate.
Formula
Fuel needed = Distance ÷ Mileage. Trip cost = Fuel needed × Price per litre.
Example: A 300 km trip in a car giving 15 km/l with fuel at ₹105/litre needs 20 litres and costs ₹2,100.
Frequently Asked Questions
▶ How do I find my vehicle's real mileage?
Fill the tank full, reset the trip meter, drive normally, then refill. Real mileage = kilometres driven ÷ litres refilled. Real-world mileage is usually 10–20% lower than the brochure figure.
▶ Does this work for bikes and diesel cars?
Yes — it works for any vehicle. Just enter that vehicle's mileage and the applicable fuel price (petrol, diesel or CNG in kg).
▶ How can I reduce my fuel cost?
Maintain steady speed, keep tyres properly inflated, avoid excess idling, service the vehicle on time and remove unnecessary weight. Combined, these can improve mileage by 10–15%.
▶ Can I split the cost between passengers?
Divide the total trip cost by the number of people sharing. For a ₹2,100 trip with 4 people, each person pays ₹525.
Worked example
A 450 km trip in a car returning 15 km/l, with petrol at ₹105 per litre:
For a return journey, double it — ₹6,300, or ₹1,575 per person.
Cost per kilometre across vehicle types
Indicative, at ₹105/litre petrol, ₹95/litre diesel and ₹8/unit electricity:
Fuel prices vary by state because of differing VAT rates, so adjust for your own location.
Why your real mileage is below the brochure figure
Manufacturer figures come from standardised test cycles that don't resemble Indian driving. Expect real-world mileage roughly 15–25% below the claimed number, and further reduced by:
- City traffic — stop-start driving can cut mileage by 25–35% versus highway running.
- Air conditioning — typically 8–15% depending on load and outside temperature.
- Under-inflated tyres — 3–5%, and the easiest thing on this list to fix.
- Aggressive acceleration and braking — up to 30% in heavy traffic.
- Speeds above 90 km/h — aerodynamic drag rises sharply.
- Roof carriers and extra weight — 5–10%.
- Overdue servicing — a clogged air filter alone can cost several percent.
Measure your own mileage properly: fill the tank completely, reset the trip meter, drive normally, then fill completely again. Divide the kilometres by the litres added. Do this over two or three tanks for a reliable figure — the dashboard readout is often optimistic.
Planning a road trip
Fuel is rarely the whole cost. For a realistic budget, add:
- Tolls — on major expressways these can approach 30–40% of the fuel cost.
- Return leg — easy to forget when estimating.
- Detours and local running — add 10–15% to your route distance.
- Wear and maintenance — a fair internal charge is ₹1.50–2.50 per km.
- Parking, especially in cities.
Comparing against a train or flight? Fuel alone makes driving look cheaper than it is. Including tolls and a maintenance allowance gives a fairer comparison, particularly for a solo traveller.
