Fuel Economy Converter

What is the fuel economy converter?

The fuel economy converter is a collection of calculators for changing one fuel economy unit into another. Convert fuel economy and fuel consumption units for cars, travel, vehicle specifications, and international MPG comparisons.

Fuel economy conversions are useful for comparing car efficiency, MPG ratings, L/100km fuel consumption, trip planning, and international vehicle specifications.

Available fuel economy units

This category includes the following units:

• Mile per US Gallon (mpg US)
• Mile per Imperial Gallon (mpg UK)
• Kilometer per Liter (km/L)
• Liter per 100 Kilometers (L/100 km)
• US Gallon per 100 Miles (US gal/100 mi)
• Imperial Gallon per 100 Miles (imp gal/100 mi)

Common fuel economy use cases

Use this category when the same measurement appears in different unit systems, data sheets, calculators, reports, or regional conventions.

• Fuel Economy conversions help compare measurements across specifications, calculators, labels, and technical references.
• Use this category when source data and target documents use different fuel economy units.
• The dedicated conversion pages show formulas, examples, tables, related pages, and FAQ for individual unit pairs.

Popular fuel economy units explained

These short unit notes help readers choose the right starting unit before opening a specific conversion page.

Common fuel economy conversion mistakes

Most wrong answers come from mixing unit systems, rounding too early, or choosing a unit that looks similar but means something different.

• Do not treat all fuel economy conversions as direct multiplication; MPG and L/100km often use reciprocal formulas.
• Do not compare US MPG with imperial MPG unless the gallon definition is clear.
• Remember that higher MPG is better, while lower L/100km is better.

Popular fuel economy conversion pages

Start with one of these common fuel economy conversions:

• mpg-us to liters-per-100-km
• liters-per-100-km to mpg-us
• mpg-us to mpg-uk
• mpg-uk to mpg-us
• kilometers-per-liter to mpg-us
• mpg-us to kilometers-per-liter

Browse fuel economy conversions by starting unit

Use these grouped links when you know the unit you are starting from and want to compare several destination units.

All fuel economy conversion pages

This complete index helps users and search engines discover every generated fuel economy conversion page.

Related categories and references

Use these links to move between neighboring converter categories, hand-written unit references, popular units, and complete site indexes.

How fuel economy conversion works

Fuel economy conversions can be reciprocal. Higher MPG or km/L means better efficiency, while lower L/100km or gallons per 100 miles means lower fuel consumption.

How to use this converter

Enter a value, choose the units, and read the converted result immediately. Each dedicated conversion page also includes a formula, examples, a conversion table, related links, and FAQ.

FAQ

Which fuel economy units are included?

This category includes miles per US gallon, miles per imperial gallon, kilometers per liter, liters per 100 kilometers, US gallons per 100 miles, imperial gallons per 100 miles and related units.

Are formulas included?

Yes. Individual conversion pages include formulas, manual steps, examples, and conversion tables.