Fuel Cost Calculator
Calculate trip fuel cost from distance, mileage and fuel price per litre.
Last updated: August 2026
Kilometres your car covers per litre.
Trip cost
₹2,000
Fuel needed
20 L
Cost per km
₹6.67
Use your car's real-world mileage, not the ARAI figure — real mileage is often 10–20% lower.
How it works
Fuel (L) = distance ÷ mileage (km/l) or distance × l/100km ÷ 100. Cost = fuel × price.
Example: 300 km at 15 km/l, ₹100/l → 20 L = ₹2,000.
Frequently Asked Questions
How do I calculate fuel cost for a trip?
Divide the distance by your mileage to get litres, then multiply by the fuel price. A 300 km trip at 15 km/l with ₹100/l diesel costs ₹2,000.
What is a realistic mileage to use?
ARAI figures are measured in ideal lab conditions. Real-world mileage is typically 10–20% lower, especially in city traffic — use your own average.
What is the difference between km/l and l/100km?
km/l is distance per litre — higher is better. l/100km is litres per 100 km — lower is better. 15 km/l equals about 6.7 l/100km.
Is petrol or diesel cheaper per kilometre?
Diesel costs more per litre but modern diesels usually give 25–40% better mileage, so per-kilometre cost is often lower on highways. Run both scenarios through the calculator to compare.