⛽ Fuel Economy Conversion

Convert between fuel economy units for automotive, fleet management, and travel planning. Supports miles per gallon US (mpg US), miles per gallon UK (mpg UK), kilometers per liter (km/L), and liters per 100 kilometers (L/100km).

Fuel economy and consumption conversion translates distance-per-volume and volume-per-distance vehicle efficiencies. 1 US MPG (miles per gallon) equals approx. 0.42514 km/L. The reciprocal formula between US MPG and European metric consumption is L/100 km = 235.215 / MPG, and for Imperial UK MPG is L/100 km = 282.481 / UK MPG.

Metrological Standards & Base Equation

L/100km = 235.215 / mpg (US). L/100km = 282.481 / mpg (UK). 1 km/L = 2.35215 mpg (US).

Automotive consumption equations conform to US EPA (Environmental Protection Agency) and European Commission Directive 1999/100/EC standards for vehicle fuel efficiency measurement and reciprocal metric-to-imperial translation.

Standards & Data Source Note: Consult our standards and methodology directory for data source provenance.

Supported Fuel Economy Units (4 Total)

Fuel Economy Unit Definitions and Scaling Factors
Unit Symbol Unit Name System Conversion Basis
MPG (US) MPG (US) Other Formula-based (non-linear)
MPG (UK) MPG (UK) Other Formula-based (non-linear)
km/L km/L Other Formula-based (non-linear)
L/100km L/100km Other Formula-based (non-linear)

Popular Fuel Economy Conversions

MPG (US) to L/100km

mpg → L/100km — fuel efficiency comparison

L/100km to MPG (US)

L/100km → mpg — international vehicle specs

km/L to MPG (US)

km/L → mpg — metric to imperial fuel economy

MPG (UK) to MPG (US)

UK mpg → US mpg — UK vs US gallon difference

L/100km to km/L

L/100km → km/L — common metric comparison

Common Use Cases

  • Vehicle comparison (mpg↔L/100km)
  • Trip fuel planning (km/L↔L/100km)
  • Fleet management (mpg↔L/100km)
  • International car imports
  • Environmental impact calculation

Frequently Asked Questions

How do I convert MPG to L/100km?

Divide 235.215 by your MPG value. For example, 30 MPG → 235.215 ÷ 30 = 7.84 L/100km.

What is the difference between US and UK gallons?

A US gallon is 3.785 liters, while a UK (imperial) gallon is 4.546 liters. This affects MPG calculations by about 20%.