Free calculator · fuel and electric
Fuel consumption calculator
Consumption is the liters added at a fill-up divided by the kilometers driven since the previous one, times 100. For example, 42 liters for 600 km gives 7.0 L/100 km. The calculator also works out the cost of a trip, the range left and a fleet's fuel budget.
Work it out in four clicks
The result follows every entry. Nothing is saved.
Example values are filled in: replace them with your own.
Consumption
7.0 L/100 km
Cost per kilometer: €0.13 (€0.126)
42 L ÷ 600 km × 100 = 7.0 L/100 km
The three formulas to know
| What you want | Formula | Example |
|---|---|---|
| Consumption (L/100 km) | liters ÷ kilometers × 100 | 42 L ÷ 600 km × 100 = 7.0 L/100 km |
| Trip cost (€) | distance × consumption ÷ 100 × price per liter | 350 km × 6.5 ÷ 100 × €1.80 = €40.95 |
| Range (km) | liters available × 100 ÷ consumption | 10 L × 100 ÷ 5.0 = 200 km |
The €1.80 per liter price is only an example: French pump prices, station by station, are on prix-carburants.gouv.fr. For an electric vehicle, the same formulas work in kWh: 48 kWh for 300 km gives 16.0 kWh/100 km.
Measuring real consumption: the full-tank method
- Fill up until the nozzle clicks off, and note the odometer.
- Drive as usual, then fill up again, at the same pump if you can.
- Divide the liters of the second fill-up by the kilometers driven, and multiply by 100.
Repeat the measurement over several fill-ups: a single one depends too much on when the nozzle clicked off.
Why your consumption differs from the official figure
The manufacturer's figure comes from a standardized test cycle, WLTP. On the road, speed, load, terrain, temperature and driving style all change consumption. Hence the value of measuring your own, vehicle by vehicle.
For a fleet: from a one-off calculation to continuous tracking
A calculation gives a figure. Across a fleet, what matters is the gap: the vehicle that burns more than the others, the fill-up that does not match the mileage, the fuel card used outside working hours.
- Fleet plan: expenses and fuel attached to each vehicle, a dashboard with 10 views and exports.
- Fleet + Telematics plan: real-time position and trips, anomaly and fraud detection.
- Fuel cards: transaction history by card and by vehicle.
Free account for up to 50 vehicles
Plus a free 15-day trial of the Fleet plan, to judge expense and fuel tracking on your own fleet.
Frequently asked questions
Fill up, note the odometer, drive, then fill up again. Divide the liters of the second fill-up by the kilometers driven and multiply by 100. For example, 42 liters for 600 km gives 7.0 liters per 100 km.
Multiply the distance by the consumption, divide by 100, then multiply by the price per liter. For 350 km at 6.5 L/100 km and €1.80 a liter: 22.75 liters, or €40.95. Double it for a round trip: €81.90.
Multiply the liters by 100 and divide by the vehicle's consumption. At 5 liters per 100 km, 10 liters take you 200 km; at 8 liters per 100 km, 125 km.
With the same formula, in kilowatt-hours: divide the energy recharged by the kilometers driven and multiply by 100. 48 kWh for 300 km gives 16.0 kWh/100 km.
By tying every fill-up and every fuel card transaction to the vehicle and its odometer. Dadycar does it in the Fleet plan, at €6 excl. VAT per vehicle per month, with a free 15-day trial.
Go further
How to calculate fuel consumption
The method step by step, and the mistakes that skew the measurement.
Read the article →Fuel consumption tracking
Fill-ups, fuel cards and odometers tied together, vehicle by vehicle.
See the feature →Total cost of ownership calculator
Fuel is one line of the bill: the full cost of a vehicle over its life.
Open the calculator →