Gas Mileage & Fuel Cost Calculator — Estimate Your Trip Fuel Expenses
Enter your trip distance, your vehicle’s mileage (km/L), the fuel price, and how many trips you make. See your total fuel cost, fuel needed, cost per trip, and cost per kilometre — instantly, in your browser, with nothing stored.
Fuel Cost Calculator
Estimate your trip fuel expenses in seconds
km
02000 km
km/L
130 km/L
₹per L
0300
trip(s)
1100
⛽
Total Fuel Cost—
🛢️Fuel Needed—
📍Total Distance—
💰Cost per Trip—
📏Cost per km—
* Results are estimates based on the values you enter. Actual fuel costs may vary due to driving conditions, vehicle load, and local fuel price fluctuations.
How to Use the Fuel Cost Calculator
Trip Distance — enter one trip’s distance in km (or switch to miles).
Fuel Efficiency — enter your vehicle’s mileage in km/L. Don’t know it? See the next section.
Fuel Price — enter today’s petrol or diesel price per litre.
Number of Trips — set how many times you make this trip (e.g., 22 working days).
Calculate — read your Total Fuel Cost, Fuel Needed, Cost per Trip, and Cost per km.
How to Find Your Vehicle’s Mileage (km/L)
This tool needs your mileage as an input. Here’s the reliable tank-full method to measure it:
Fill your tank completely and note the odometer (or reset the trip meter).
Drive normally until the tank is noticeably down.
Fill up completely again, noting the litres added and the distance since the last fill.
Example: 400 km driven, 20 litres refilled → 400 ÷ 20 = 20 km/L. Enter that into the calculator above.
Worked Example — Cost of a 500 km Trip
Trip distance 500 km, mileage 18 km/L, fuel price ₹100/L, one trip:
Fuel needed = 500 ÷ 18 ≈ 27.8 litres • Total cost = 27.8 × ₹100 ≈ ₹2,778 • Cost per km ≈ ₹5.56
Set Number of Trips to 22 to see a monthly commute total — here, about ₹61,100.
km/L vs L/100km vs MPG — Units Explained
Unit
Means
Better when
Used in
km/L
kilometres per litre
higher
India
L/100km
litres to drive 100 km
lower
Europe
MPG
miles per US gallon
higher
USA
Convert from km/L: L/100km = 100 ÷ km/L, and US MPG ≈ km/L × 2.35. So 20 km/L = 5 L/100km ≈ 47 MPG — three ways of saying the same efficiency.
Typical Mileage by Vehicle Type
Approximate ranges for petrol vehicles:
Vehicle
Rough mileage (km/L)
Scooter / motorcycle
40–60
Small hatchback
18–24
Sedan
14–18
SUV
10–15
Broad ranges only — actual figures depend on the model, engine, load, and conditions. Diesel versions usually return a few km/L more than petrol.
Simple Ways to Improve Your Mileage
Keep tyres at the recommended pressure, avoid harsh acceleration and braking, remove unnecessary weight, service on schedule (air filter, spark plugs), and switch off the engine at long stops. A sudden drop in mileage often points to under-inflated tyres or a clogged air filter.
Frequently Asked Questions
Divide distance travelled by fuel used — for example, 400 km on 20 litres is 20 km/L. The most accurate way is the tank-full method: fill up, drive, fill up again, then divide the distance covered by the litres added.
Km per litre = total kilometres travelled ÷ litres of fuel used. Once you know your km/L, enter it above with your trip distance and fuel price to estimate total cost.
Divide the distance by your mileage. At 20 km/L, a 200 km trip needs 200 ÷ 20 = 10 litres. The calculator shows this as its “Fuel Needed” output.
Find fuel needed (distance ÷ mileage), then multiply by fuel price. A 500 km trip at 18 km/L and ₹100/L needs about 27.8 litres, costing roughly ₹2,778 — about ₹5.56 per km. Enter your own numbers above for an exact estimate.
They measure the same thing differently. km/L (India) and MPG (USA) are distance per fuel — higher is better. L/100km (Europe) is fuel per distance — lower is better. To convert: L/100km = 100 ÷ km/L, and US MPG ≈ km/L × 2.35. So 20 km/L = 5 L/100km ≈ 47 MPG.
It depends on the vehicle. Small petrol hatchbacks typically return 18–24 km/L, sedans 14–18, and SUVs 10–15; two-wheelers often do 40–60. Diesel versions usually return a few km/L more.
Common causes are under-inflated tyres, a clogged air filter, overdue servicing, extra load, or aggressive stop-start driving. Check tyre pressure first, then service items. Measuring mileage before and after a service confirms any improvement.
Yes. It runs entirely in your browser, requires no login, and doesn’t store any data. It uses standard formulas and gives estimates based on the values you enter.
