How do I calculate my vehicle's actual mileage?

Fill the tank, reset the trip meter, drive normally, then refill to the same level. Divide the distance travelled by the fuel added at the second refill. This calculator converts that measurement into four common efficiency units.

Why should I measure mileage between full-tank refills?

The fuel added at the second full refill approximates the fuel used since the first refill. Measuring from partial fills makes the consumed quantity uncertain and can distort the result.

What is the difference between km/L and L/100 km?

km/L reports distance obtained from one litre, so higher is better. L/100 km reports fuel consumed over 100 kilometres, so lower is better. They are reciprocal measures connected by 100 divided by the other value.

Are US MPG and Imperial MPG the same?

No. A US gallon is 3.785411784 litres and an Imperial gallon is 4.54609 litres. The same vehicle therefore has a higher numerical Imperial MPG result than US MPG.

Can I use miles with litres or kilometres with gallons?

Yes. Select the units matching your odometer and fuel receipt. The calculator converts distance and volume internally before displaying all four efficiency measures.

Why does mileage change from one refill to another?

Traffic, idling, speed, weather, gradients, payload, tyre pressure, air conditioning, driving style, pump shutoff, and refill level can all change a single-tank result. Average several full-tank measurements for a steadier figure.

Does this calculator work for bikes, scooters, cars, and trucks?

Yes. It uses measured distance and fuel volume, so it works for any petrol or diesel road vehicle. It does not diagnose mechanical condition or verify the accuracy of an odometer or fuel pump.

Does vehicle mileage include petrol price or trip cost?

No. Mileage measures fuel efficiency, not money. Use the trip, daily, or monthly petrol calculator after measuring mileage when you want an expense estimate.

Fuel efficiency

Vehicle Mileage Calculator

Measure real-world fuel efficiency between fill-ups. Enter distance travelled and fuel used to see km/L, L/100 km, US MPG, and Imperial MPG without entering a fuel price.

Bike, scooter, car, or truck
Privacy-first
Round-trip auto-double

Calculate Your Vehicle Mileage

Distance travelled

Trip-meter or odometer difference between fill-ups.Fuel used

Fuel added at the second full-tank refill.

Kilometres per litre

12.50 km/L

Litres per 100 km

8.00 L/100 km

US miles per gallon

29.40 US MPG

Imperial miles per gallon

35.31 Imp MPG

Formula and example

How the Vehicle Mileage Calculator Works

Mileage is distance travelled divided by fuel used. Conversions use 1 mile = 1.609344 kilometres, 1 US gallon = 3.785411784 litres, and 1 Imperial gallon = 4.54609 litres. Calculations keep full precision internally and round displayed results to two decimals.

Mileage formula

km/L = (Distance ÷ Fuel used)

For example, a driver fills the tank, resets the trip meter, travels 500 km, then adds 40 litres to refill it.

km/L

500 ÷ 40

12.50 km/L

L/100 km

40 ÷ 500 × 100

8.00 L/100 km

US MPG

converted

29.40 MPG

Illustrative reference

Vehicle Mileage Calculator Example

Reference economy ranges beside the fuel and petrol cost they produce on a 30 km trip. Measure your own vehicle to replace them with real-world figures.

Currency

Detecting your currency — pick one manually if you prefer.

Petrol price per litre

per litre

Use the current pump price in your currency. It is not fetched automatically.

Vehicle

km/L

Vehicle	Fuel economy	Fuel / day	Cost / day	Cost / month
Light commuter bike	55–65	0.50 L	—	—
Standard commuter bike	45–50	0.63 L	—	—
Mid-size commuter bike	45–50	0.63 L	—	—
Sport commuter bike	40–45	0.71 L	—	—
Larger commuter bike	38–42	0.75 L	—	—
Light city scooter	50–55	0.57 L	—	—
Comfort scooter	42–48	0.67 L	—	—
Urban scooter	48–52	0.60 L	—	—
Compact hatchback	18–22	1.50 L	—	—
Small family car	14–17	1.94 L	—	—
Mid-size sedan	12–15	2.22 L	—	—
Compact sedan	13–16	2.07 L	—	—
Large sedan	11–13	2.50 L	—	—
Large SUV	8–10	3.33 L	—	—
Pickup truck	9–12	2.86 L	—	—
Compact SUV	12–14	2.31 L	—	—

Based on a 30 km trip using the midpoint of each economy range. Add a petrol price to see daily and monthly cost.

How to use it

Calculate Vehicle Mileage

Fill the tank to a repeatable level and note the odometer, or reset the trip meter. Drive normally through a representative mix of routes. Refill at the same level, ideally at the same pump orientation. Record litres or gallons added; this approximates fuel consumed. Subtract the first odometer reading from the second, or read the trip meter, then enter distance and fuel with their exact units.

One tank can be affected by pump shutoff and refill angle. Record several fill-ups and divide their combined distance by combined fuel for a more stable real-world average.

01Use case

Full-tank method

Fill, drive normally, refill to the same level, then enter distance and fuel.

02Use case

Compare units

See one measurement expressed as km/L, L/100 km and both MPG systems.

03Use case

Feed cost tools

Use your measured average in the trip, daily or monthly calculators.

Mileage guide

Vehicle Mileage Guide

Understand the efficiency units, what moves a tank-to-tank reading, and how to use the result in the cost calculators.

km/L, L/100 km, US MPG, and Imperial MPG

Distance per fuel unit

km/L and MPG tell you how far the vehicle travels per unit of fuel. A higher value means greater efficiency. Always state whether MPG is US or Imperial.

Fuel per fixed distance

L/100 km tells you how much fuel is consumed over 100 kilometres. A lower value means greater efficiency. Convert between metric measures using L/100 km = 100 ÷ km/L.

Use the result in cost calculators

Once you have an observed average, enter it in the trip petrol calculator, daily calculator, or monthly calculator with your local petrol price.

What can change a mileage measurement?

Refill consistency

Automatic pump shutoff, vehicle angle, temperature, and topping off can change the recorded fuel amount.

Route and traffic

Short trips, congestion, idling, gradients, wind, and road surface affect fuel consumption.

Vehicle and load

Tyre pressure, maintenance, cargo, passengers, roof racks, towing, and air conditioning can alter efficiency.

Driving behaviour

Speed, acceleration, braking, gear selection, and warm-up habits can make tank-to-tank results vary.

Compare like with like. A city-only tank should not be treated as an exact prediction for steady highway travel. An average across several representative tanks is usually more useful than one unusually good or poor result.

Methodology, Accuracy and Assumptions

The calculator assumes the entered distance and fuel volume are positive, accurate, and refer to the same measurement period. It assumes the second full refill replaces the fuel consumed after the first full refill.

Odometer error, tyre-size changes, fuel leaks, pump calibration, incomplete fills, fuel used while stationary, and mixed operating conditions can affect the measurement. The result is an estimate of observed efficiency, not a manufacturer rating, mechanical diagnosis, emissions figure, or total ownership cost.

This page targets actual mileage and fuel-consumption measurement. It does not attempt to rank for petrol expense, trip cost, fuel-price comparison, or monthly budgeting queries served by dedicated cost calculators.

The calculator normalizes entries to kilometres and litres, derives all four measures from the same unrounded quantities, and rounds only the displayed results. No account, location, fuel-price feed, or exchange rate is required.

See the sitewide calculation methodology and petrol expense formula guide. Last reviewed: 17 September 2026.

FAQ

Vehicle Mileage Questions

Answers about full-tank measurement, metric consumption, gallon types, and real-world variation.

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