Fuel Cost per 100 km
Calculates fuel cost per 100 km given the vehicle consumption in km/L and price per liter.
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L/100km and cost per 100 km: the European metric
In Europe efficiency shows up as liters per 100 km, where a smaller number is the better one. That flips the logic of km/L. To convert, use L/100km = 100 / (km/L), and the trip cost in the same unit comes from cost_per_100km = (100 · price_per_L) / km_per_L. Take a car doing 12 km/L with fuel at R$ 6.20/L as an example: 100/12 lands around 8.33 L/100km, which works out to R$ 51.67 for every 100 km you drive.
Applications: ICE vs EV cost comparison
Putting different powertrains side by side gets simpler in L/100km. A Tesla Model 3 doing ~15 kWh/100km on electricity at R$ 0.70/kWh runs about R$ 10 per 100 km. Cover the same distance in a gasoline car at 12 km/L and R$ 6/L and you are near R$ 30 per 100 km, around three times as much. The calculation earns its keep when you are weighing a new BEV against an ICE, working out what a fleet will cost, or reading the fuel figures printed on European spec sheets.
FAQ
Why is the European unit inverse to km/L? Fuel use rises in a straight line with L/100km, and so does cost. Each extra unit just means more liters in the tank and more reais out of pocket.
Is 7 L/100km good? It is. That comes to roughly 14.3 km/L, toward the top of what you see from popular gasoline compacts.
How do I include ethanol on a flex car? Plug in the price and the consumption you get on that fuel. Then fall back on the 70% rule, which says ethanol pays off as long as its price stays at or below 70% of gasoline's.
Does it work for electric cars? Swap L for kWh and the price per L for R$/kWh. The formula stays the same and hands you the cost per 100 km.
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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.