Fuel Economy Converter
Convert between miles per gallon (US and UK), kilometres per litre and litres per 100 km. Higher MPG is better, but lower L/100 km is better.
Enter a value
Result
30 miles per gallon (us) =
7.84049 L/100km
30 mpg (US) → 7.84049 L/100km
L/100 km = 235.215 ÷ mpg (US) · L/100 km = 282.481 ÷ mpg (UK)
Show the working
- Convert 30 mpg (US) to the base unit (L/100 km): 7.84049.
- Convert that to L/100km: 7.84049.
30 mpg (US) in every unit
Typical fuel economy
- Small car
- 6.7 L/100km (35 mpg US)
- Family saloon
- 8.4 L/100km (28 mpg US)
- Large SUV
- 11.8 L/100km (20 mpg US)
- Hybrid
- 4.5 L/100km (52 mpg US)
Good to know: 30 US mpg is about 7.84 L/100 km.
About this tool
Convert fuel economy between MPG (US/UK), L/100km, and km/L — for comparing vehicle efficiency across regions.
Formula
L/100km = 235.215 ÷ MPG(US). km/L = MPG(US) × 0.425. MPG(UK) uses 282.48 instead.
Reference values
- 30 MPG (US) = 7.84 L/100km
- 1 L/100km = 235.2 MPG (US)
- 10 km/L = 23.5 MPG (US)
Questions people ask
How do I convert MPG to L/100 km?
Divide 235.215 by the US MPG figure. For UK MPG, divide 282.481 by the figure.
Why is UK MPG higher than US MPG for the same car?
A UK gallon (4.546 L) is larger than a US gallon (3.785 L).
What is a good fuel economy?
Small cars are often around 6–7 L/100 km and large SUVs 11–12 L/100 km. Hybrids can be under 5.
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How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
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