Mileage Calculator
Find your vehicle's real-world fuel efficiency in km/L, L/100km and mpg
Calculation Mode
Distance Traveled (km)
km
Fuel Consumed (L)
L
Fill tank, drive, refuel — enter litres added on second fill
Fuel Price (₹/L) optional — for cost per km
₹
Fuel Efficiency
—
Consumption: —
Miles per Gallon (mpg)—
Distance Covered—
Fuel Used—
Cost per km—
What is Vehicle Mileage?
Mileage (fuel efficiency) is the distance your vehicle can travel on one unit of fuel — measured in km/L in India. Higher mileage means better fuel economy and lower running costs. Manufacturer-claimed mileage is tested under ideal conditions; real-world mileage is typically 15–30% lower.
This calculator helps you measure your actual mileage using the fill-up method — the most accurate way to determine real-world fuel economy. Use either direct distance + fuel input or odometer readings.
lightbulb Example Calculation
Scenario: Rohit fills his Maruti Swift's tank completely, then drives 380 km over a week. He refuels with 28.5 L to fill up again.
1Mileage = 380 ÷ 28.5 = 13.3 km/L
2Consumption = 100 ÷ 13.3 = 7.5 L/100km
3At ₹95/L: cost per km = ₹7.14/km
✓ Swift claimed 22.4 km/L — real-world is 40% lower
help_outlineHow to Measure Your Car's Actual Mileage
- Fill your fuel tank completely — till the nozzle clicks off. Note or reset your trip odometer to zero.
- Drive normally for at least 200–400 km across a mix of city and highway to get a representative sample.
- Refuel at the same pump — fill completely again. Note the exact litres added (shown on the pump display).
- Enter the distance driven (trip meter reading) and litres added into the calculator above.
- Or use the Odometer mode — note start/end odometer readings instead of using the trip meter.
Typical Mileage by Vehicle Type
- Small hatchback (800–1000cc petrol): 16–22 km/L
- Mid-size sedan (1200–1500cc petrol): 13–18 km/L
- Compact SUV (diesel): 15–20 km/L
- Full-size SUV (2000cc diesel): 12–16 km/L
- 100–125cc motorcycle: 50–65 km/L
- 150–200cc motorcycle: 35–50 km/L
- Electric vehicle: 5–8 km/Wh (very different metric)
Key Terms
- km/L (Kilometres per Litre)
- The standard mileage measure in India. Higher is better. Most Indian passenger cars: 12–22 km/L in real-world conditions.
- L/100km (Litres per 100 km)
- European fuel consumption standard. Lower is better. A car with 15 km/L = 6.67 L/100km. Convert: L/100km = 100 ÷ km/L.
- mpg (Miles per Gallon)
- US and UK standard. 1 km/L ≈ 2.35 mpg (US gallon). Conversion: mpg = km/L × 2.35215.
- Fill-up Method
- Most accurate way to measure real mileage. Fill tank completely, drive, fill again — litres added equals fuel consumed since last fill. Single tank or trip readings can be affected by partial fills.
quizFrequently Asked Questions
Why is my car's actual mileage much lower than the manufacturer claims?
Manufacturer mileage figures are tested under controlled laboratory conditions (ARAI testing in India) using a standardized drive cycle that doesn't reflect real traffic. Key reasons for lower real-world mileage: city traffic with frequent stops (reduces mileage 25–40%), AC usage (reduces 5–15%), aggressive driving (reduces 10–20%), carrying extra load, incorrect tyre pressure, engine not warmed up for short trips, and highway speed above 80 km/h (aerodynamic drag increases sharply). Mileage claims use the most favorable test cycle — treat claimed mileage as a comparison tool between models, not an absolute real-world figure.
How many times should I measure to get accurate mileage?
Measure for at least 3–5 full tanks to get a reliable average. A single measurement can be skewed by: partial fill-up on first tank (affects starting baseline), pump calibration differences, short trip with cold engine always running, or an unusual traffic day. Track mileage every time you refuel over a month — the average of 4–6 fill-ups gives your true real-world fuel economy. You'll also notice seasonal variation: AC use in summer and cold-start richness in winter reduce mileage by 10–20% compared to spring/autumn.
Does driving style really affect mileage significantly?
Yes — driving style is the single biggest factor within driver control. Hard acceleration from traffic lights is the largest mileage killer: accelerating to 60 km/h then braking vs accelerating smoothly can differ by 30–40% fuel use. Maintaining a steady speed using cruise control on highways instead of varying between 80–120 km/h can improve mileage by 10–15%. Anticipatory braking (coast to decelerate rather than brake suddenly) also saves fuel. Studies show two drivers with identical cars in identical traffic can have mileage differences of 25% or more — purely due to driving habits.
How does tyre pressure affect mileage?
Under-inflated tyres increase rolling resistance — the energy your engine spends just rolling the car. For every 10 PSI below recommended pressure, fuel efficiency decreases by approximately 0.5–3%. Most passenger cars require 30–35 PSI (front and rear may differ — check the sticker inside the driver's door). Check tyre pressure monthly when tyres are cold (before driving). Over-inflation beyond 5 PSI above recommended can reduce tyre grip without significant mileage benefit and increases uneven wear.
What is the difference between km/L and mpg?
Both measure fuel efficiency but in different unit systems. km/L (kilometres per litre) is the Indian/metric standard — how far you travel on 1 litre of fuel. mpg (miles per gallon) is the US standard. To convert: 1 km/L = 2.35215 US mpg. A car giving 15 km/L equals 35.3 mpg. L/100km is the European standard — the inverse of km/L: a 15 km/L car uses 6.67 L per 100 km. This calculator shows all three formats simultaneously so you can compare with specifications from different regions.