MPG to L/100 km Converter

Miles per gallon and liters per 100 kilometers describe vehicle efficiency from opposite perspectives. US MPG reports the distance a vehicle travels on one US gallon of fuel, so a higher MPG value indicates better economy. L/100 km reports the fuel consumed to travel 100 kilometers, so a lower value indicates better economy. This inverse relationship means conversion requires division rather than a simple multiplier. The calculator uses the US-gallon constant 235.214583. To convert MPG to L/100 km, divide 235.214583 by the MPG value. To convert L/100 km to MPG, divide the same constant by the L/100 km value. A car rated at 35 MPG therefore uses about 6.720417 L/100 km. An SUV consuming 12.5 L/100 km returns about 18.817167 MPG. Zero cannot be converted because it would require division by zero. These calculations use the US liquid gallon, which contains about 3.785411784 liters. Imperial MPG uses the larger UK gallon and therefore produces a different numeric result for the same physical efficiency. If a listing comes from the United Kingdom, confirm whether it reports imperial MPG before comparing it with a US vehicle label. This converter is intended for US MPG, matching common EPA ratings. Fuel-economy conversion helps drivers compare vehicles sold in different markets, interpret travel information, estimate consumption, and discuss efficiency with international audiences. The converted rating is a direct unit translation; it does not predict the exact fuel used on a particular trip. Speed, traffic, temperature, tire pressure, elevation, payload, driving style, and accessory use can all shift real-world consumption away from an official test result. Because the scales are reciprocal, equal changes in MPG do not represent equal changes in fuel consumption. Improving from 10 to 20 MPG saves much more fuel over a fixed distance than improving from 40 to 50 MPG. L/100 km often makes those consumption differences easier to see. Use enough decimal places for comparisons, but avoid implying greater accuracy than the original vehicle rating. For budgeting, combine the converted consumption with expected distance and current fuel price.