Travel & Vehicles · Fuel

Mileage Calculator — Fuel Efficiency (km/l, mpg, L/100 km)

Measure your car's or bike's real fuel efficiency with the fill-to-fill method: odometer readings and the fuel you put in give km per litre, litres per 100 km and miles per gallon (US and UK), plus the running cost per km. Or simply convert between fuel-economy units.

Your inputs

Quick start — try a typical case

I Want To

Currency

Odometer at Last Full Tank

Odometer Now (tank filled again)

Odometer In

Fuel Added to Refill

Fuel In

Fuel Price per Litre (optional)

Your result Live

Your Mileage

14.67 km/l

462 km on 31.5 litres

Litres per 100 km: 6.82
Miles per Gallon: 34.5 (US) · 41.4 (UK)
Fuel Cost per km: ₹7.02
Cost of This Tank: ₹3,245
Fuel Cost per 1,000 km: ₹7,023

For the most accurate figure, fill to the brim both times at the same pump, and average over several tanks.

How this is calculated

km/l = distance since the last full tank ÷ litres to refill · L/100 km = 100 ÷ km/l · mpg (US) = km/l × 2.352

Fill-to-fill: Fill the tank, reset or note the odometer, drive, then refill — the fuel that refills it is the fuel you used

The fill-to-fill method is the most reliable way to measure mileage: the fuel needed to refill a full tank is exactly what you burned since the last fill. Divide the distance by it.

Assumptions & sources

Tank filled to the same level both times.

1Fuel economy and unit conversions — NIST Special Publication 811 (SI conversion factors)

Calculator ID TRV-MILEAGE-001 · version 1.0.0

Common questions

How do I calculate my car's mileage?

Fill the tank fully and note the odometer. Next time, fill it fully again: km driven ÷ litres added = km per litre.

What is a good mileage?

For petrol hatchbacks in India, 15–20 km/l in mixed driving is typical; SUVs 10–14 km/l; 100–125 cc bikes 45–65 km/l.