Fuel Converter

Introduction

The Fuel Converter helps you convert between different fuel efficiency units — miles per gallon (MPG), liters per 100km, and kilometers per liter — useful for comparing vehicle fuel efficiency across international standards.

How to Use

1. Enter your fuel efficiency value

Select the source unit (e.g., MPG)

Select the target unit (e.g., liters per 100km)

Click "Convert" for an instant result

Conversion Reference

MPG to L/100km: divide 235.21 by the MPG value

1 km/L ≈ 2.352 MPG (US)

Higher MPG = better efficiency; Lower L/100km = better efficiency (inverse relationship)

Worked Example

If a car is rated at 40 MPG (a common US rating) and you want to compare it to European L/100km ratings, dividing 235.21 by 40 gives approximately 5.88 L/100km — helping you directly compare fuel efficiency between vehicles marketed with different regional standards.

Practical Context

Fuel efficiency conversion is essential when comparing vehicles across international markets (US uses MPG, Europe typically uses L/100km, while some countries use km/L), planning international road trips (estimating fuel costs and needs), and understanding environmental impact ratings that vary by region's measurement conventions.

FAQs

Q1: Why does a lower number mean better efficiency in L/100km but a higher number mean better efficiency in MPG?

This is because MPG measures distance per unit of fuel (more distance = better), while L/100km measures fuel needed per fixed distance (less fuel = better) — they're inverse relationships, which is why direct numerical comparison without conversion can be misleading.

Q2: Is US MPG the same as UK MPG?

No, US gallons and UK (Imperial) gallons are different sizes, so a vehicle's MPG rating will show a different number depending on which gallon standard is used — always confirm which standard is being referenced when comparing vehicles.

Q3: How can I use fuel conversion to estimate a road trip's fuel cost?

Convert your vehicle's efficiency rating to a consistent unit, calculate the total fuel needed for your trip distance, then multiply by the local fuel price per unit to estimate total fuel expenses for trip planning.

Q4: Why do hybrid and electric vehicles use different efficiency metrics?

Electric vehicles use metrics like miles per kWh or km per kWh since they don't consume liquid fuel, while some hybrid ratings combine both electric and gasoline consumption metrics — direct comparison with traditional MPG requires understanding these different measurement approaches.