About this calculator
Fuel economy measures how efficiently a vehicle uses fuel, expressed in miles per gallon (MPG) in the United States and liters per 100 kilometers (L/100km) in most other countries.
MPG = distance traveled (miles) / fuel consumption (gallons). L/100km = (liters of fuel consumed / kilometers traveled) × 100. Conversion: MPG = 235.21 / (L/100km).
This calculator can also estimate the fuel cost of a trip: Divide the trip distance by the fuel consumption to get the amount of fuel required, then multiply by the fuel price. Great for road trip budgeting, comparing vehicle efficiency and tracking fuel expenses.
What it calculates
The fuel economy calculator finds vehicle fuel efficiency, fuel consumption, and trip cost using units such as mpg and L/100 km.
Formula
- mpg = miles driven / gallons used.
- L/100 km = liters used / kilometers driven * 100.
- Fuel cost = fuel used * price per fuel unit.
Inputs
- Distance driven.
- Fuel used.
- Optional fuel price.
- Target unit.
Example
| Input | Calculation | Result |
|---|---|---|
| 300 mi, 10 gal | 300/10 | 30 mpg |
| 500 km, 35 L | 35/500*100 | 7 L/100 km |
| 40 L, $1.5/L | 40*1.5 | $60 |
How to interpret the result
Higher mpg usually means better efficiency; lower L/100 km usually means better efficiency. Convert units before comparing.
Common mistakes
- mpg and L/100 km move in opposite directions.
- Check whether distance is miles or kilometers.
- City and highway fuel economy can differ a lot.
How to use
Using the fuel consumption calculator is easy. First, select the unit in which you want to calculate fuel consumption: liters per 100 kilometers (L/100km, commonly used in China) or miles per gallon (MPG, commonly used in the United States). Then, enter the distance traveled and the amount of fuel consumed. Click the "Calculate" button and the calculator will immediately display the fuel consumption results.
For example, to calculate L/100km: 500 kilometers traveled and 35 liters of gasoline consumed. Enter distance 500, fuel 35, and select L/100km as the unit. The result is 7 L/100km (that is, 7 liters of gasoline consumed per 100 kilometers).
Calculate MPG: 300 miles traveled, 10 gallons of gas consumed. Enter distance 300, fuel 10, and select MPG as the unit. The result is 30 MPG (or 30 miles per gallon).
The calculator also supports unit conversion. If you know the MPG value of your vehicle and want to convert it to L/100km or vice versa, you can use the conversion function. Click the "Reset" button to clear all inputs and start a new calculation.
Main features
This fuel consumption calculator has the following features: supports two mainstream fuel consumption units (L/100km and MPG); adopts precise conversion formulas to ensure accurate calculation results; supports mutual conversion between units; has a simple and intuitive interface, easy to use; has fast response speed and calculation results are displayed instantly; is completely free, no registration or download is required; supports desktop and mobile device access; provides fuel consumption assessment and fuel saving suggestions.
Use cases
The fuel consumption calculator is very useful in multiple scenarios. When buying a car, compare the fuel consumption of different models and choose a more economical vehicle. The fuel consumption data provided by the manufacturer may not be consistent with the actual fuel consumption. Use a calculator to calculate the real fuel consumption.
When using the car on a daily basis, regularly calculate fuel consumption and monitor the vehicle status. If fuel consumption suddenly increases, it may be due to insufficient tire pressure, engine maintenance, poor driving habits, etc. Find problems in time through changes in fuel consumption.
Before a long trip, estimate the amount of fuel required and the cost based on fuel consumption and distance traveled. Plan gas station stops to avoid running out of fuel. When renting a car, know your vehicle’s fuel consumption and budget for your travel costs.
When traveling cross-country or buying an imported car, different countries use different fuel consumption units. The United States uses MPG, China uses L/100km, and Europe also uses L/100km. Use a calculator for quick conversions and easy comparisons.
When environmental awareness increases, calculating fuel consumption can help you understand your carbon emissions. Choose a more fuel-efficient driving style to reduce your environmental impact.