Case 1
- Figure to convert
- 8
- From unit
- L/100 km
- To unit
- MPG (US)
29.402
Open with these valuesFuel Economy Converter
29.402
Result: 29.402Consumption and efficiency are reciprocals, so there is no factor to multiply by: L/100 km = 235.215 ÷ MPG (US), or 282.481 ÷ MPG (UK). Double the MPG and the litres per 100 km halve. Watch the gallon — the imperial one holds 4.546 L against the US 3.785 L, so UK figures read about 20 % higher.
Most-used pairs
each is its own pageL/100 km to MPG (US)8 L/100 km = 29.4 MPG (US), 4 = 58.8MPG (US) to L/100 km30 MPG (US) = 7.84 L/100 km, 60 = 3.92L/100 km to MPG (UK)8 L/100 km = 35.3 MPG (UK), 4 = 70.6MPG (UK) to L/100 km40 MPG (UK) = 7.06 L/100 km, 80 = 3.53L/100 km to km/L8 L/100 km = 12.5 km/L, 4 = 25 km/L
All 4 units
| Unit | Symbol | One unit in l100km | Typical use |
|---|---|---|---|
| Litres per 100 km | l100km | 1 | Consumption figure in Europe |
| Miles per gallon (US) | US | 235.214583 | Efficiency figure in the US, 3.785 L gallon |
| Miles per gallon (UK) | UK | 282.481 | Efficiency figure in the UK, 4.546 L gallon |
| Kilometres per litre | kmpl | 100 | Efficiency figure in India and Japan |
These are not multipliers: this conversion shifts as well as scales, so one unit expressed in the base does not scale up. Use the converter above.
Litres per 100 km to Miles per gallon (US)
prints complete- 1 l100km
- 235.214583 US
- 2 l100km
- 117.607292 US
- 3 l100km
- 78.404861 US
- 4 l100km
- 58.803646 US
- 5 l100km
- 47.042917 US
- 6 l100km
- 39.202431 US
- 7 l100km
- 33.602083 US
- 8 l100km
- 29.401823 US
- 9 l100km
- 26.134954 US
- 10 l100km
- 23.521458 US
- 11 l100km
- 21.383144 US
- 12 l100km
- 19.601215 US
- 13 l100km
- 18.093429 US
- 14 l100km
- 16.801042 US
- 15 l100km
- 15.680972 US
- 16 l100km
- 14.700911 US
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Worked examples
Case 2
- Figure to convert
- 30
- From unit
- MPG (US)
- To unit
- L/100 km
7.840
Open with these valuesCase 3
- Figure to convert
- 5
- From unit
- L/100 km
- To unit
- km/L
20.000
Open with these valuesHow it's calculated
L/100 km = 235.214583 ÷ MPG (US) = 282.481 ÷ MPG (UK)
- StepEnter your figure and say which unit it is in.
- StepIt is first turned into litres per 100 km, the shared base.
- ResultThat consumption is inverted again into the unit you asked for.
Reference table
| L/100 km | MPG (US) | MPG (UK) | km/L |
|---|---|---|---|
| 4 | 58.80 | 70.62 | 25.00 |
| 5 | 47.04 | 56.50 | 20.00 |
| 6 | 39.20 | 47.08 | 16.67 |
| 8 | 29.40 | 35.31 | 12.50 |
| 10 | 23.52 | 28.25 | 10.00 |
| 12 | 19.60 | 23.54 | 8.33 |
Questions
How do I convert MPG to L/100 km?
Divide the constant by your MPG: L/100 km = 235.215 ÷ MPG (US). Thirty MPG (US) therefore comes to 7.8405 L/100 km. For imperial gallons the constant is 282.481 instead.
Why can't I just multiply by a fixed factor?
Because consumption and efficiency are reciprocals. L/100 km says how much fuel a fixed distance takes, MPG says how far a fixed amount of fuel goes. Doubling the MPG halves the L/100 km, which no single multiplier can do.
What is the difference between US MPG and UK MPG?
A US gallon is 3.785 litres while a UK imperial gallon is 4.546 litres, about 20 % larger. The same car goes further on the bigger gallon, so it shows a higher MPG in the UK.
Is a lower or a higher number better?
It depends on the unit. For L/100 km lower is better — less fuel for the same distance. For MPG and km/L higher is better, because they measure distance per unit of fuel.
Why can't I convert a value of zero?
The relationship is a reciprocal, and dividing by zero is undefined. A consumption of 0 L/100 km or an efficiency of 0 MPG has no finite counterpart in the other unit.
Sources and last check
Information, not professional advice.