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MPG to L/100km Converter

Convert fuel economy between MPG (US/UK) and L/100km instantly. Includes km/L and mi/gal reference. The essential tool for comparing cars across regions.

miles per US gallon (3.785 L)

miles per Imperial gallon (4.546 L)

liters per 100 kilometers (lower = better)

kilometers per liter (higher = better)

Common Fuel Economy Reference

Vehicle Type MPG (US) MPG (UK) L/100km km/L

About This Tool

Buying a car from another country? Comparing fuel economy specs? Converting between miles per gallon and liters per 100 kilometers is confusing — and this tool makes it instant. Enter a value in any format — US MPG, UK MPG, L/100km, or km/L — and see all conversions at once. The US gallon (3.785 L) and UK gallon (4.546 L) are different, so the tool handles both correctly. No more mental math or wrong assumptions. Whether you're an American reading European car reviews, a European looking at US specs, or anyone comparing international fuel efficiency ratings — this is the converter you need.

How to Use

1. Enter a fuel economy value in any of the four input fields 2. All other values update instantly — no need to click anything 3. Use the quick presets for common efficiency levels (economy car, SUV, etc.) 4. The comparison chart shows how your value ranks 5. Click "Copy Link" to share a specific conversion

Formula

L/100km = 235.215 ÷ MPG (US) L/100km = 282.481 ÷ MPG (UK) km/L = 100 ÷ L/100km MPG (UK) = MPG (US) × 1.201 Note: US gallon = 3.785 L, UK gallon = 4.546 L Lower L/100km = better efficiency Higher MPG = better efficiency

Frequently Asked Questions

How do I convert MPG to L/100km?
Divide 235.215 by the MPG value (for US gallons). For example, 30 MPG (US) = 235.215 ÷ 30 = 7.84 L/100km. For UK gallons, divide 282.481 by the MPG. The formula is inverse because MPG measures distance per fuel unit, while L/100km measures fuel per distance.
What is the difference between US and UK MPG?
US gallons (3.785 L) are smaller than UK/Imperial gallons (4.546 L). The same car will have a higher MPG number in UK units. For example, 30 MPG (US) = 36 MPG (UK). Always check which gallon standard is used — US specs use US gallons, UK/Australian specs use Imperial gallons.
What is a good L/100km rating?
For a passenger car: under 6 L/100km is excellent, 6-8 is good, 8-10 is average, over 10 is poor. Hybrids can achieve 4-5 L/100km. City driving uses more fuel (higher L/100km) than highway driving. Electric vehicles are measured in kWh/100km instead.
What is a good MPG?
For US MPG: over 40 is excellent (hybrids, efficient compacts), 30-40 is good, 25-30 is average, under 25 is poor. For UK MPG, add about 20% to these numbers. Actual MPG depends on driving conditions — city driving is significantly lower than highway.
Why do European cars use L/100km instead of MPG?
L/100km is the standard in most of the world (Europe, Asia, Australia) because it directly shows fuel consumption. It's easier to calculate trip costs: multiply L/100km by distance in hundreds of km, then by fuel price. Lower numbers = better efficiency. The US uses MPG by tradition.
How do I convert km/L to MPG?
Multiply km/L by 2.352 to get US MPG, or by 2.825 to get UK MPG. For example, 15 km/L = 35.3 MPG (US) or 42.4 MPG (UK). km/L is commonly used in Japan and some Asian countries.
Is 30 MPG good for a car?
30 MPG (US) is good for a mid-size car or small SUV — it equals 7.84 L/100km. For a compact car, you'd expect 35-40 MPG. For a large SUV or truck, 25 MPG would be considered good. Hybrids typically achieve 45-55 MPG in mixed driving.

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