MPG (UK) to km/L Converter
Convert Imperial miles per gallon (MPG UK) to kilometers per liter (km/L). Formula: km/L = MPG (UK) × 0.354006.
How to Convert MPG (UK) to km/L
The conversion is linear: both MPG and km/L express distance travelled per unit of fuel, just in different units. Multiply by a single factor.
- km/L = MPG (UK) × 0.354006
The factor 0.354006 = 1.609344 km per mile ÷ 4.54609 L per Imperial gallon, from exact NIST / ISO definitions.
MPG (UK) ↔ km/L Reference Table
Common fuel-economy values expressed in all four units. Click any MPG (UK) value for a dedicated conversion page.
| MPG (UK) | km/L | MPG (US) | L/100km | Category |
|---|---|---|---|---|
| 25 | 8.85 | 20.8 | 11.3 | Below average |
| 30 | 10.6 | 25.0 | 9.42 | Average |
| 35 | 12.4 | 29.1 | 8.07 | Average |
| 40 | 14.2 | 33.3 | 7.06 | Good |
| 45 | 15.9 | 37.5 | 6.28 | Good |
| 50 | 17.7 | 41.6 | 5.65 | Good |
| 60 | 21.2 | 50.0 | 4.71 | Very good |
| 70 | 24.8 | 58.3 | 4.04 | Excellent |
Common MPG (UK) to km/L Conversions
| MPG (UK) | km/L | L/100km |
|---|---|---|
| 20 MPG | 7.08 | 14.1 |
| 21 MPG | 7.43 | 13.5 |
| 22 MPG | 7.79 | 12.8 |
| 23 MPG | 8.14 | 12.3 |
| 24 MPG | 8.50 | 11.8 |
| 25 MPG | 8.85 | 11.3 |
| 26 MPG | 9.20 | 10.9 |
| 27 MPG | 9.56 | 10.5 |
| 28 MPG | 9.91 | 10.1 |
| 29 MPG | 10.3 | 9.74 |
| 30 MPG | 10.6 | 9.42 |
| 31 MPG | 11.0 | 9.11 |
| 32 MPG | 11.3 | 8.83 |
| 33 MPG | 11.7 | 8.56 |
| 34 MPG | 12.0 | 8.31 |
| 35 MPG | 12.4 | 8.07 |
| 36 MPG | 12.7 | 7.85 |
| 37 MPG | 13.1 | 7.63 |
| 38 MPG | 13.5 | 7.43 |
| 39 MPG | 13.8 | 7.24 |
| 40 MPG | 14.2 | 7.06 |
| 41 MPG | 14.5 | 6.89 |
| 42 MPG | 14.9 | 6.73 |
| 43 MPG | 15.2 | 6.57 |
| 44 MPG | 15.6 | 6.42 |
| 45 MPG | 15.9 | 6.28 |
| 46 MPG | 16.3 | 6.14 |
| 47 MPG | 16.6 | 6.01 |
| 48 MPG | 17.0 | 5.89 |
| 49 MPG | 17.3 | 5.76 |
| 50 MPG | 17.7 | 5.65 |
| 51 MPG | 18.1 | 5.54 |
| 52 MPG | 18.4 | 5.43 |
| 53 MPG | 18.8 | 5.33 |
| 54 MPG | 19.1 | 5.23 |
| 55 MPG | 19.5 | 5.14 |
| 56 MPG | 19.8 | 5.04 |
| 57 MPG | 20.2 | 4.96 |
| 58 MPG | 20.5 | 4.87 |
| 59 MPG | 20.9 | 4.79 |
| 60 MPG | 21.2 | 4.71 |
| 61 MPG | 21.6 | 4.63 |
| 62 MPG | 21.9 | 4.56 |
| 63 MPG | 22.3 | 4.48 |
| 64 MPG | 22.7 | 4.41 |
| 65 MPG | 23.0 | 4.35 |
| 70 MPG | 24.8 | 4.04 |
| 75 MPG | 26.6 | 3.77 |
| 80 MPG | 28.3 | 3.53 |
Frequently Asked Questions
How do I convert MPG (UK) to km/L?
Multiply your Imperial MPG value by 0.354006. Example: 50 MPG (UK) × 0.354006 = 17.7 km/L. The factor comes from 1.609344 km per mile ÷ 4.54609 L per Imperial gallon.
Is MPG (UK) to km/L a linear conversion?
Yes. Unlike MPG ↔ L/100km (inverse), MPG ↔ km/L is a straight multiplication because both express fuel economy in the same direction (distance per fuel). Doubling MPG doubles km/L: 30 MPG (UK) = 10.62 km/L, 60 MPG (UK) = 21.24 km/L.
Where is km/L commonly used?
km/L is the standard fuel-economy unit in India, Japan, Brazil, Egypt, and several other non-European countries. It reads in the same direction as MPG (bigger = better), which makes translation from a UK spec sheet simpler than to L/100km.
Related Fuel Economy Converters
A Linear Bridge Between Imperial and Metric Economy
Unlike the MPG ↔ L/100km conversion, which is inverse, MPG (UK) ↔ km/L is a simple linear transformation. Both units measure the same thing — distance travelled per unit of fuel — just in different length and volume scales. The conversion factor is the ratio of the two: 1 mile (1.609344 km) divided by 1 Imperial gallon (4.54609 L) gives 0.354006 km per litre per MPG (UK).
Because the conversion is multiplicative, the arithmetic is easy: if your car does 50 MPG (UK), it does 50 × 0.354 ≈ 17.7 km/L. Double the MPG, double the km/L.
Where km/L Is the Default
While Europe prefers L/100km and the UK and US still quote MPG, a large part of the non-European world uses km/L: India, Japan, Brazil, Argentina, Egypt, Nigeria, and others. The unit is popular because it reads in the same intuitive direction as MPG: a higher number is better fuel economy. This makes km/L the natural comparison point when a UK-sourced spec sheet needs translating for an audience used to Imperial MPG's "more is better" logic.
Quick Mental Math: MPG (UK) to km/L
The exact factor 0.354 is inconveniently fractional for mental arithmetic. Two shortcuts:
- Divide by 3 and add ~15%: 60 MPG ÷ 3 = 20, plus 15% ≈ 23 (vs exact 21.24). Gets you in the right ballpark.
- Multiply by 0.35: for 1% accuracy, use 0.354. Example: 40 MPG (UK) × 0.354 = 14.16 km/L.
The ×0.35 shortcut is within 2% of the exact formula — plenty accurate for on-the-road comparisons.
Reference Table with UK Vehicle Examples
| Vehicle Example | MPG (UK) | km/L | Notes |
|---|---|---|---|
| Large SUV (e.g. Range Rover petrol) | 22 | 7.79 | Combined WLTP |
| Performance sedan (e.g. BMW M340i) | 30 | 10.62 | Combined WLTP |
| Family SUV (e.g. Nissan Qashqai petrol) | 38 | 13.45 | Combined WLTP |
| Petrol family car (e.g. Ford Focus) | 45 | 15.93 | Combined WLTP |
| Efficient diesel (e.g. Skoda Octavia TDI) | 60 | 21.24 | Combined WLTP |
| Hybrid compact (e.g. Toyota Yaris Hybrid) | 68 | 24.07 | Combined WLTP |
Why km/L Is the Simplest Cross-Border Comparison
When comparing UK cars to Indian or Japanese ones, km/L is the most direct translation — no inversions, no different-sized gallons, just multiply by a single factor. For converting a UK review to a Brazilian or Indian audience, quote km/L first. For European or continental audiences, convert to L/100km instead, since that's the unit used on their fuel-economy labels.
Full Conversion Table
Need a printable reference? See the full MPG (UK) to km/L conversion table with pre-calculated values, CSV download, and print-friendly layout.
