Fuel Consumption Calculator
A fuel consumption calculator helps you measure and compare vehicle efficiency by converting between different fuel economy metrics. Whether you think in miles per gallon, liters per 100 kilometers, or kilometers per liter, this tool makes it easy to understand and compare fuel usage across different measurement standards used worldwide.
Understanding your vehicle's fuel consumption is crucial for budgeting travel costs, comparing vehicles before purchase, and reducing your environmental footprint. Fuel efficiency varies significantly based on driving conditions, vehicle maintenance, speed, and load, making it important to track and optimize your consumption over time.
How it works
Common conversions: L/100km = 235.215 / MPG (US), km/L = 100 / (L/100km), MPG (US) = 235.215 / (L/100km). Note: US gallons (3.785 L) differ from imperial gallons (4.546 L), affecting MPG calculations.
Use cases
- Comparing fuel efficiency of different vehicles before buying
- Calculating trip fuel costs based on distance and current fuel prices
- Converting between MPG and L/100km for international vehicle specs
- Tracking fuel economy over time to monitor vehicle health
Frequently asked questions
How do I calculate fuel consumption per 100 km?
Fill your tank completely, reset the trip odometer, and drive normally until your next fill-up. Then divide the liters of fuel added by the kilometers driven and multiply by 100. For example, using the same principle in reverse, a car rated at 8 L/100km uses 8 liters of fuel for every 100 kilometers traveled.
How do I convert MPG to liters per 100 km?
Divide 235.215 by the MPG value to get L/100km, and the same formula works in reverse: L/100km = 235.215 / MPG (US). For example, 30 MPG (US) equals roughly 7.8 L/100km. Note that this constant applies to US gallons only, since imperial gallons are larger.
What is the difference between US MPG and imperial MPG?
A US gallon holds 3.785 liters while an imperial (UK) gallon holds 4.546 liters, so the same car shows a higher MPG figure when measured in imperial gallons. Always check which gallon a specification uses before comparing vehicles, especially between American and British sources.
Is a higher or lower L/100km better?
Lower is better for L/100km because it measures how much fuel you burn to cover a fixed distance. The opposite applies to MPG and km/L, where higher numbers mean better efficiency since they measure how far you travel on a fixed amount of fuel.
How can I reduce my car's fuel consumption?
Keep tires properly inflated, stay on top of vehicle maintenance, avoid aggressive acceleration and hard braking, and reduce unnecessary weight in the car. Fuel efficiency also varies with speed and driving conditions, so tracking your consumption over time helps you spot problems early and confirm which habits actually save fuel.