Fuel Cost Calculator for Trips
Fuel, tolls and time for any trip — split between everyone in the car.
Trip cost
Not updated: these figures are for your last complete entry. Fix the field marked above to update them.
Enter the distance, the efficiency and the price.
Working
Results are estimates for general information and planning, not financial advice. Banks and institutions may calculate differently (rounding, fees, rate changes). Confirm figures with your lender or a qualified adviser before deciding.
About the Fuel Cost Calculator for Trips
Find out what a drive will cost before you set off. Enter the distance, your vehicle’s fuel efficiency and today’s fuel price, and the calculator works out the fuel you will use, what it costs, the cost per kilometre and — with tolls, parking and other costs added — the total for the trip, split equally between everyone sharing the car so the shares add up exactly.
It works for petrol and diesel (km/L, L/100 km, US or UK mpg, price per litre or gallon), CNG (km/kg) and electric cars (km/kWh, kWh/100 km, Wh/km or mi/kWh, with optional charging losses). Choose there and back, or several trips to cost a month of commuting. Add your average speed and breaks to see the driving time and when you will arrive. The working is shown step by step.
How to use it
- Enter the one-way distance in km or miles, and choose One way or There and back. For a regular commute, set the number of trips.
- Pick the fuel, then enter the efficiency in the unit you know (km/L, L/100 km, mpg, km/kg or kWh/100 km) and the price per litre, gallon, kg or kWh.
- Add tolls, parking and other costs for one trip — both ways for There and back — and the number of people sharing the cost.
- Optional: open Driving time and arrival, enter your average speed, breaks and departure time.
- Read the total, the share per person and the working; Copy summary to send it to the group.
Examples
Petrol at ₹100 a litre, one way
23.33 L of petrol · ₹2,333.33 · ₹6.67 per km
350 km each way at 15 km/L, ₹100 a litre, tolls ₹450 for both ways
₹4,666.67 + ₹450 = ₹5,116.67 → ₹1,705.56 + ₹1,705.56 + ₹1,705.55
18 km each way, 22 days, 40 km/L scooter at ₹102.50 a litre, ₹30 parking a day
792 km · 19.8 L · ₹2,029.50 fuel + ₹660 parking = ₹2,689.50
300 km at 15 kWh/100 km, ₹8 per kWh, 10% charging loss
50 kWh · ₹400
100 miles at 30 mpg (US), $3.50 a gallon
3.33 US gallons · $11.67
Common uses
- Budgeting a road trip and agreeing what each passenger chips in.
- Comparing the running cost of petrol, CNG and electric vehicles per km.
- Working out a monthly commuting cost or a car-pool contribution.
- Converting mileage between km/L, L/100 km and US or UK mpg.
How the cost is worked out
- Fuel used = distance ÷ efficiency (for km/L, km/kg, km/kWh), or distance × consumption ÷ 100 (for L/100 km, kWh/100 km), or distance × Wh/km ÷ 1,000.
- Fuel cost = fuel used × price per litre, kg or kWh. Electric: the energy is increased by the charging loss you enter (with 10%, 45 kWh used means 50 kWh drawn from the charger).
- Total = fuel cost + (tolls + parking + other costs) × number of trips.
- Per person: the total is split in whole paise (or cents) so the shares add up exactly; when it does not divide evenly, the first people pay one paisa more.
- Driving time = one-way distance ÷ average speed, plus breaks; the arrival time adds it to your departure.
Unit conversions
The calculator converts with the factors in NIST Special Publication 811, Appendix B.9 (NIST): 1 mile = 1.609344 km and 1 UK (imperial) gallon = 4.54609 L, both exact, and 1 US gallon = 3.785412 L (by definition 231 cubic inches, or 3.785411784 L). So 1 km/L = 2.352 mpg (US) = 2.825 mpg (UK), and L/100 km = 100 ÷ km/L — 15 km/L is 6.67 L/100 km, 35.3 mpg (US) or 42.4 mpg (UK).
Getting a realistic efficiency figure
Use your own figure where you can: fill the tank, reset the trip meter, drive normally, fill up again and divide the kilometres driven by the litres (or kg) you put in. Many cars show a running average on the trip computer, and electric cars show kWh/100 km or km/kWh. Rated figures from standard tests are a starting point, but heavy traffic, high speed, air conditioning, a full load and hilly roads all use more fuel.
Limitations
- Fuel prices are not built in — they change by city and by day — so enter the price you will pay.
- The efficiency is taken as constant for the whole trip; real consumption varies with speed, traffic, load and terrain.
- Driving time is distance ÷ average speed; it does not know the route, traffic or road conditions.
- Tolls are what you enter; the calculator does not look up toll plazas or FASTag rates.
Privacy
Everything happens in your browser. Your fuel type, units, efficiency and price are remembered in this browser so the next trip is quicker to cost; nothing is uploaded.
Frequently asked questions
How do I calculate the fuel cost of a trip?
Divide the distance by your mileage to get the fuel needed, then multiply by the price. For 350 km at 15 km/L and ₹100 a litre: 350 ÷ 15 = 23.33 L, and 23.33 × ₹100 = ₹2,333.33. For a return trip, double the distance.
How do I convert km/L to L/100 km or mpg?
L/100 km = 100 ÷ km/L, so 15 km/L is 6.67 L/100 km. mpg (US) = km/L × 2.352, and mpg (UK) = km/L × 2.825, so 15 km/L is about 35.3 mpg (US) or 42.4 mpg (UK). The tool shows all of them for your figure.
How much does it cost to drive an electric car?
Multiply the distance by the energy use and the price per unit: 300 km at 15 kWh/100 km uses 45 kWh, which at ₹8 per unit is ₹360. Charging loses some energy, so if your figure is from the car’s display, add the loss — at 10% you pay for 50 kWh, or ₹400.
How do I split fuel costs between passengers?
Enter the number of people sharing the cost. The total (fuel plus tolls and parking) is divided equally to the paisa, so the shares always add up to the total. For uneven splits or several drivers paying, use the group expense splitter.
Does it include the cost of tolls?
Yes, if you enter them. Enter what one trip costs — for There and back, the tolls of both ways. They are counted for each trip, so with 22 trips a ₹30 parking fee counts as ₹660.