Fuel Consumption & Cost per Km Calculator

Calculate fuel economy in km/L and L/100 km, then estimate fuel cost per kilometre, per 100 km and per month. Free calculator, no login or fuel-price lookup required.

Calculate fuel use and driving cost

Enter a driving distance and litres consumed to see your fuel economy.

No details are transmitted or stored by this calculator. If monthly distance is entered without a fuel price, only economy results are shown.

How is fuel consumption calculated?

Kilometres per litre (km/L) = distance travelled ÷ litres used. Litres per 100 km (L/100 km) = (litres used ÷ distance travelled) × 100.

For example, travelling 350 km using 28 litres produces 12.5 km/L and 8.0 L/100 km.

How to get a more accurate result

For a meaningful tank-to-tank result: use comparable full-tank refills, record the exact volume added on the second fill, and repeat across several tanks. A partial refill, inconsistent filling point or odometer error can skew the result.

Fill your tank and note the odometer or trip meter reading.
Drive normally, then refuel and record the litres added.
Calculate the distance driven between refuels.
Enter the distance and fuel used above. Repeat over multiple fill-ups to understand the trend.

Results are estimates. Driving conditions, traffic, fuel measurement and how consistently you refill can affect your readings.

Can I track fuel costs too?

Use the price-per-litre field to estimate cost per km and per 100 km, and optionally estimate monthly fuel spending. Results are based on the fuel economy you enter, not a guarantee of future costs. GEMENEV-ODO can store your fill-ups and expenses over time.

Next: build a reliable maintenance history

Explore your full vehicle costs

Fuel spending is only one part of ownership. Use our service history log and free CSV to track repairs, and try the maintenance checklist for recurring checks.

Planning more than fuel costs?

This calculator focuses on fuel economy and driving costs. To budget for servicing, tyres, inspections and unexpected repairs too, use our free vehicle maintenance budget worksheet.