Fuel Cost Calculator
Calculate the cost of any road trip
km
L/100km
per L
Total Fuel Cost
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Fuel Required
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Cost per km/mile
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What is a fuel cost calculator?

A fuel cost calculator estimates the total petrol or diesel cost for any trip based on distance, your vehicle's mileage, and the current fuel price. It helps you budget trips, compare routes, and understand your monthly fuel spend.

Formula used

Fuel required (litres) = Distance (km) ÷ Mileage (km/L) Fuel cost = Litres × Price per litre Cost per km = Total cost ÷ Distance

How to use this calculator

  1. Enter distance in km
  2. Enter your vehicle's mileage in km/L (check your car manual or measure it)
  3. Enter current petrol/diesel price per litre
  4. Click Calculate

Example

Example 1 — Mumbai to Pune (150 km):
Distance: 150 km | Mileage: 15 km/L | Petrol: ₹103/L
Fuel needed = 150 ÷ 15 = 10 litres | Cost = 10 × ₹103 = ₹1,030

Example 2 — Annual commute cost:
Daily commute: 40 km | Mileage: 18 km/L | Petrol: ₹103/L
Daily cost = 40 ÷ 18 × ₹103 = ₹229/day
Monthly (22 days): ₹5,038 | Annual: ₹60,456

Petrol vs CNG comparison (same 40 km commute):
Petrol at ₹103/L, 18 km/L: ₹229/day
CNG at ₹75/kg, 28 km/kg: ₹107/day → saves ₹122/day = ₹32,296/year

Frequently asked questions

Fill a full tank, reset the trip meter. Drive normally until near empty, refill to full. Mileage = km driven ÷ litres filled. Repeat 2–3 times for accuracy.
Petrol cars: 12–20 km/L. Diesel: 15–22 km/L. CNG equivalent: 25–30 km/kg. Heavy traffic and hilly terrain reduce mileage 20–30%.
Yes — running AC reduces mileage by 8–15% depending on the car and conditions. At highway speeds, closing windows and using AC is actually more fuel-efficient than open windows due to drag.