What is 30 MPG in L/100 km?
30 US MPG equals 7.84 L/100 km.
Fuel economy conversion
MPG to L/100km converter calculator
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To convert miles per gallon (US MPG) to liters per 100 km, divide 235.215 by the MPG number. 30 US MPG equals 7.84 L/100 km; 40 US MPG equals 5.88 L/100 km. The two metrics are inverse: MPG goes up as fuel use goes down.
Featured mpg to l/100km converter answer
MPG
15 MPG (US)
L/100km converter
15.68 L/100 km
Formula: L/100km = 235.214583 ÷ mpg (US). Open the live calculator to convert any value.
Formula
L/100km = 235.214583 ÷ mpg (US)
L/100 km = 235.215 / MPG (US). The constant comes from 100 km × 3.78541 L per US gallon ÷ 1.609344 km per mile = 235.215. For imperial MPG (UK), use 282.481 instead.
Common values
| From | To |
|---|---|
| 15 MPG (US) | 15.68 L/100 km |
| 20 MPG (US) | 11.76 L/100 km |
| 25 MPG (US) | 9.41 L/100 km |
| 30 MPG (US) | 7.84 L/100 km |
| 35 MPG (US) | 6.72 L/100 km |
| 40 MPG (US) | 5.88 L/100 km |
| 50 MPG (US) | 4.70 L/100 km |
| 60 MPG (US) | 3.92 L/100 km |
| 80 MPG (US) | 2.94 L/100 km |
| 100 MPG (US) | 2.35 L/100 km |
Background
MPG and L/100 km move in opposite directions, which is why fuel-economy comparisons across regions can be confusing. Doubling MPG halves L/100 km. Most of the world has switched to L/100 km because it scales linearly with fuel cost: a 1-point improvement at 5 L/100 km saves more fuel than a 1-MPG improvement at 50 MPG.
Common use cases
- Translate US car listings into the fuel-economy format common in Europe and many international reviews.
- Compare vehicles that publish mixed mpg and L/100km efficiency figures.
- Check trip-planning or fleet spreadsheets without manually applying the inverse formula.
Frequently asked questions
Why does the formula use division instead of multiplication?
Because MPG (distance per fuel) and L/100 km (fuel per distance) are inverse units. Higher MPG = lower L/100 km.
Is US MPG the same as UK MPG?
No. The US gallon is 3.78541 L; the imperial (UK) gallon is 4.54609 L. A car rated 30 UK MPG is roughly 25 US MPG. Always check the source country.
Which metric is more intuitive for fuel cost?
L/100 km. It scales linearly with cost: doubling L/100 km doubles fuel spend per trip. MPG is non-linear, so the same 10-MPG bump means different things at 20 MPG vs 40 MPG.
What's considered fuel-efficient in L/100 km?
For a gasoline passenger car: under 6 L/100 km is good (about 40 MPG US), under 4 L/100 km is excellent (60+ MPG US, hybrid territory). EVs report kWh/100 km separately.
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