Calculate your vehicle's real-world mileage from the distance travelled and fuel consumed - more accurate than the manufacturer-claimed figure.
How to Use the Mileage Calculator
Enter the "Distance Travelled (km)" since your last full tank - use your odometer readings.
Enter the "Fuel Consumed (liters)" to cover that distance.
Optionally enter the "Fuel Price" to see your running cost per km.
Click "Calculate Mileage" to see your vehicle's real-world mileage.
How Mileage and Running Cost Are Calculated
Mileage (km per litre) = Distance travelled ÷ Fuel consumed
Running cost per km = Fuel price ÷ Mileage (shown only when you enter a price)
Both results are rounded to two decimal places. The calculation is only as good as the two numbers you enter, so the method you use to measure distance and fuel matters more than anything else.
The Full-Tank Method, Step by Step
Fill the tank until the nozzle clicks off automatically. Do not top up further. Note the odometer reading or reset a trip meter.
Drive as you normally would until at least half the tank is used. A longer stretch gives a more reliable average.
Fill up again at the same pump if possible, stopping at the first click. The litres shown on the pump are the fuel consumed.
Subtract the first odometer reading from the new one to get the distance travelled.
Example: the odometer reads 12,450 km at the first fill and 12,862 km at the second, and the second fill takes 27.5 litres. Distance is 412 km, so mileage = 412 ÷ 27.5 = 14.98 km per litre. With petrol at ₹102 per litre, the running cost is about ₹6.81 per km.
For a steadier figure, repeat this over three fills and add up the totals. Three fills of 412, 398 and 430 km using 27.5, 26.8 and 29.1 litres give 1,240 km on 83.4 litres, or about 14.87 km per litre.
km per Litre vs Litres per 100 km
India usually quotes mileage as km per litre, while many international reviews use litres per 100 km. To convert, divide 100 by either figure.
km per litre
Litres per 100 km
8
12.5
10
10.0
12.5
8.0
15
6.67
20
5.0
25
4.0
40
2.5
Common Measurement Mistakes
Using the amount of the previous fill instead of the one that replaces the fuel you just used. The litres that matter are those added at the end of the measured stretch.
Filling by rupee amount (for example ₹500) and estimating the distance from the fuel gauge. Gauges are not linear, so this can be badly off.
Relying only on the dashboard's average figure. It is a useful guide but is an estimate made by the car, and can differ from a pump-based calculation.
Comparing a highway-only reading with the city figure of another car. Note what kind of driving each measurement covered.
Frequently Asked Questions
Manufacturer figures are measured under controlled test conditions. Real-world mileage is usually lower due to traffic, AC usage, driving style, load, and road conditions.
The most reliable method is the "full tank to full tank" approach: fill up completely, note the odometer reading, drive normally, then fill up completely again and note the liters added and the new odometer reading.
Yes, this calculator works the same way for any fuel-powered vehicle - car, bike, or truck.
Yes. Enter the kilograms of CNG filled in the fuel box and the price per kg in the price box. The result is then in km per kg, even though the label says km per litre.
First rule out changes in your driving, such as more city traffic or AC use. If the drop persists, common causes are low tyre pressure, a clogged air filter, dragging brakes or an overdue service. Have a mechanic check the vehicle if the fall is large or sudden.