Efficiency
Convert between litres per 100 km, kilometres per litre, and miles per gallon.
Result
2.35215MPG (US)
Conversions use the standard formulas: L/100km (base), 100÷km/L, 235.215÷MPG(US), 282.481÷MPG(UK).
Fuel economy measures how far a vehicle travels on a fixed amount of fuel. North American standards use MPG (miles per gallon); European and global standards use L/100km (litres consumed per 100 kilometres). The two are inversely related: higher MPG is better (more distance per gallon), while lower L/100km is better (less fuel consumed). A converter translates between these and other regional standards like km/L and miles per litre.
The converter uses reciprocal formulas to flip between forward-consumption and backward-consumption metrics. For MPG to L/100km: multiply by 235.214 (a constant derived from unit conversions), then divide the result into 100. For L/100km to MPG: divide 235.214 by the L/100km figure. Real-world fuel economy depends on driving conditions (highway vs. city), vehicle load, and maintenance—but the converter standardises measurements so you can compare any two vehicles fairly.
L/100km = 235.214 ÷ MPG (US) | MPG = 235.214 ÷ L/100km | km/L = 100 ÷ L/100km235.214 is the conversion constant that accounts for the difference between US gallons (3.78541 litres) and imperial miles (1.60934 km). Dividing instead of multiplying reverses the logic because fuel economy inverts with consumption: cars with high MPG have low L/100km.
| Input | Result | Notes |
|---|---|---|
| A Tesla Model 3 rated at 25 MPG combined (US) | 9.4 L/100km | Modern electric cars often measure efficiency in MPGe (miles per gallon equivalent) or kWh/100km; combustion cars in your region use one of these scales. |
| A Citroën C3 rated at 5.2 L/100km (Europe) | 45.2 MPG (US) | Small European hatchbacks often achieve excellent fuel economy because they're lighter and optimised for mixed urban/highway driving. |
| An older SUV rated at 18 MPG combined (US) | 13.1 L/100km | Larger vehicles with lower aerodynamics and higher weight consume more fuel proportionally. |
They measure opposite directions. MPG asks 'how many miles per gallon'—higher is better. L/100km asks 'how much fuel per distance'—lower is better. The conversion constant flips the scale.
Yes, for US gallons and kilometres. If your source uses imperial gallons (UK), multiply by 282.48 instead. The difference comes from litre and gallon definitions.
It translates the label figures accurately, but real-world fuel economy is typically 10–20% worse than manufacturer ratings due to traffic, weather, and driving habits.
Not directly; EVs use kWh/100km or MPGe. You'd need to convert electrical energy back to fuel equivalent first—use an EV-specific calculator for that.
Convert it to L/100km by dividing 100 by the km/L figure, then use this tool. Most converters accept km/L as an input option too.
No; the converter translates between measurement standards, not actual driving conditions. Fuel type and terrain affect real consumption, not the unit conversion itself.