Enter today's fuel price in your city
Use real-world mileage, not ARAI certified figures
Optional: enter to calculate monthly fuel cost
What is a Fuel Cost Per KM Calculator?
A fuel cost per km calculator helps you understand the exact running cost of your vehicle for every kilometre you travel. This is one of the most practical tools for vehicle owners in India, where fuel prices vary daily and significantly impact monthly budgets.
Whether you own a petrol car, diesel car, CNG vehicle, or a two-wheeler, knowing your per-km fuel cost helps you budget travel expenses, compare the cost of driving versus public transport, and evaluate the true cost of a new vehicle purchase.
This calculator works for all fuel types and any vehicle class — from city hatchbacks to heavy trucks.
How is Fuel Cost Per KM Calculated?
The formula is straightforward:
To calculate monthly fuel cost:
Factors that affect real-world mileage:
- Driving conditions: City traffic vs. highway — highway gives 20–30% better mileage.
- Vehicle age and maintenance: Worn spark plugs, dirty air filters, and low tyre pressure all reduce efficiency.
- Air conditioning: Running AC increases fuel consumption by 8–15%.
- Driving speed: Most petrol cars achieve peak efficiency between 60–80 km/h.
Example Calculation
Tip: Always use real-world mileage (70–80% of ARAI figures) for accurate estimates.
Frequently Asked Questions
Fuel cost per km = Fuel price per litre ÷ Mileage (km per litre). For example, if petrol is ₹106/litre and your car gives 15 km/litre, the cost per km is ₹106 ÷ 15 = ₹7.07 per km.
For a petrol hatchback or sedan, 15–20 km/litre is considered good mileage under city conditions. SUVs return 12–16 km/litre. Bikes and scooters generally offer 40–60 km/litre.
Fuel prices in India change daily and vary by city. Check via Indian Oil, BPCL, or HPCL websites, or SMS 'RSP' to 9224992249 (Indian Oil). The price shown at petrol pumps already includes all taxes and dealer margins.
Aggressive acceleration and hard braking can reduce mileage by 15–30%. Driving at 60–80 km/h gives optimal mileage. Properly inflated tyres, clean air filters, and regular servicing also improve fuel efficiency significantly.
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Disclaimer: Results are for informational and educational purposes only — not financial, tax, or legal advice. Tax slabs, rates (EPF, PPF, home loan), and rules shown are based on data available in 2025 and may change. Always verify with a qualified professional or official government sources before making financial decisions.