THE FUEL ECONOMY CONVERTER
Convert miles per gallon to litres per 100 km in US or UK gallons,
or go the other way. Also shows litres per km and km per litre.
Enter the MPG figure from your vehicle or fuel report.
A US gallon is 3.7854 litres. For UK vehicle figures, choose UK gallons.
litres per 100 kilometres
0.0672 L/km
14.88 km/L
35 US MPG uses approximately 6.72 litres for every 100 km.
CONVERT THE OTHER WAY
Enter litres per 100 kilometres to see both
US and UK miles per gallon.
Enter the litres used to travel 100 kilometres. For example, enter 8 for a fuel consumption of 8 L/100 km.
29.40US MPG
35.31UK MPG
0.0800 L/km
12.50 km/L
8 L/100 km is approximately 29.40 US MPG or 35.31 UK MPG.
To convert L/100 km to MPG, divide 235.2145833… by L/100 km for US gallons, or 282.4809363… for UK imperial gallons. MPG results are rounded to two decimal places.
NEXT STEP
Turn MPG or L/100 km into a trip cost, a cost per km or mile, a yearly fuel bill, or compare two cars side by side.
POPULAR CONVERSIONS
Each page shows US and UK results, fuel used over distance,
running cost and nearby values.
Every MPG value: 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 75 80
THE QUICK REFERENCE
Compare common MPG values at a glance. Select a value for its own page.
US and UK gallons have different volumes,
so make sure you use the right column.
| MPG | US gallons | UK gallons | ||
|---|---|---|---|---|
| L/km | L/100 km | L/km | L/100 km | |
| 10 | 0.2352 | 23.52 | 0.2825 | 28.25 |
| 15 | 0.1568 | 15.68 | 0.1883 | 18.83 |
| 20 | 0.1176 | 11.76 | 0.1412 | 14.12 |
| 25 | 0.0941 | 9.41 | 0.1130 | 11.30 |
| 30 | 0.0784 | 7.84 | 0.0942 | 9.42 |
| 35 EXAMPLE | 0.0672 | 6.72 | 0.0807 | 8.07 |
| 40 | 0.0588 | 5.88 | 0.0706 | 7.06 |
| 45 | 0.0523 | 5.23 | 0.0628 | 6.28 |
| 50 | 0.0470 | 4.70 | 0.0565 | 5.65 |
| 60 | 0.0392 | 3.92 | 0.0471 | 4.71 |
| 70 | 0.0336 | 3.36 | 0.0404 | 4.04 |
| 80 | 0.0294 | 2.94 | 0.0353 | 3.53 |
L/km rounded to 4 decimal places. L/100 km rounded to 2.
BEHIND THE NUMBERS
Divide a conversion constant by your MPG.
We keep full precision until the final result.
L/km = 2.352145833… ÷ MPG
For litres per 100 km, use 235.2145833… ÷ MPG.
2.352145833… ÷ 35 ≈ 0.0672 L/km
That is approximately 6.72 L/100 km.
L/km = 2.824809363… ÷ MPG
For litres per 100 km, use 282.4809363… ÷ MPG.
2.824809363… ÷ 35 ≈ 0.0807 L/km
That is approximately 8.07 L/100 km.
How the constants are calculated: litres in one gallon ÷ kilometres in one mile. We use 1 mile = 1.609344 km, 1 US liquid gallon = 3.785411784 L, and 1 imperial gallon = 4.54609 L. See NIST unit definitions
A LITTLE MORE CLARITY
L/km measures fuel used to travel one kilometre. L/100 km measures fuel used to travel 100 kilometres. Multiply L/km by 100 to get L/100 km: for example, 0.08 L/km is 8 L/100 km. Both describe fuel consumption; a lower number means less fuel used for the same distance.
For US MPG, divide 2.352145833… by the MPG value. For UK imperial MPG, divide 2.824809363… by the MPG value. For example, 40 US MPG is about 0.0588 L/km, while 40 UK MPG is about 0.0706 L/km.
Choose the gallon standard used in the original fuel economy figure. US vehicle specifications generally use US liquid gallons; UK figures generally use imperial gallons. For an imported car or an international review, check the source rather than choosing based only on where you live.
30 US MPG is approximately 7.84 L/100 km, or 0.0784 L/km. 30 UK imperial MPG is approximately 9.42 L/100 km, or 0.0942 L/km. The gallon standard makes a difference.
Divide 235.2145833… by your L/100 km value for US MPG, or 282.4809363… for UK MPG. For example, 8 L/100 km is approximately 29.40 US MPG or 35.31 UK MPG. To convert directly from L/km, use 2.352145833… or 2.824809363… instead.
Yes, when comparing the same gallon standard: higher MPG means more distance travelled per gallon. Litres per kilometre works the other way around, so lower L/km means less fuel consumed. Actual fuel use also depends on driving conditions, load and the vehicle.
No. A UK imperial gallon is 4.546 litres and a US gallon is 3.785 litres, so the same car shows a higher MPG figure in UK gallons. Multiply US MPG by 1.201 to get UK MPG, or divide UK MPG by 1.201 to get US MPG. For example, 30 US MPG is about 36 UK MPG.
As a rough guide for cars, under 6 L/100 km is very good, 6 to 8 is good to average, 8 to 10.5 is average to thirsty, and above 10.5 is thirsty. Hybrids and small cars often manage under 5 L/100 km; large SUVs, utes and pickups often use 11 or more.