How to convert miles per gallon to US gallons per 100 miles
gal/100 mi = 120.0949926 ÷ mpg (UK)Miles per gallon and US gallons per 100 miles are inversely related: when one goes up the other goes down. Divide 120.0949926 by the value — do not multiply.
Worked examples
- 1 mile per imperial gallon120.0949926 ÷ 1 = 120.0949926 gal/100 mi
- 5 miles per gallon (UK)120.0949926 ÷ 5 = 24.01899851 gal/100 mi
- 10 miles per gallon (UK)120.0949926 ÷ 10 = 12.00949926 gal/100 mi
- 20 miles per gallon (UK)120.0949926 ÷ 20 = 6.004749628 gal/100 mi
- 100 miles per gallon (UK)120.0949926 ÷ 100 = 1.200949926 gal/100 mi
Miles per gallon (UK) to US gallons per 100 miles conversion table
Values are calculated by the conversion engine using the full formula and rounded to 8 significant figures.
| Miles per gallon (mpg (UK)) | US gallons per 100 miles (gal/100 mi) |
|---|---|
| 10 mpg (UK) | 12.009499 gal/100 mi |
| 12 mpg (UK) | 10.007916 gal/100 mi |
| 15 mpg (UK) | 8.0063328 gal/100 mi |
| 18 mpg (UK) | 6.671944 gal/100 mi |
| 20 mpg (UK) | 6.0047496 gal/100 mi |
| 22 mpg (UK) | 5.4588633 gal/100 mi |
| 25 mpg (UK) | 4.8037997 gal/100 mi |
| 28 mpg (UK) | 4.2891069 gal/100 mi |
| 30 mpg (UK) | 4.0031664 gal/100 mi |
| Miles per gallon (mpg (UK)) | US gallons per 100 miles (gal/100 mi) |
|---|---|
| 32 mpg (UK) | 3.7529685 gal/100 mi |
| 35 mpg (UK) | 3.4312855 gal/100 mi |
| 40 mpg (UK) | 3.0023748 gal/100 mi |
| 45 mpg (UK) | 2.6687776 gal/100 mi |
| 50 mpg (UK) | 2.4018999 gal/100 mi |
| 55 mpg (UK) | 2.1835453 gal/100 mi |
| 60 mpg (UK) | 2.0015832 gal/100 mi |
| 70 mpg (UK) | 1.7156428 gal/100 mi |
| 100 mpg (UK) | 1.2009499 gal/100 mi |
About the units
Mile per imperial gallon (mpg (UK))
Miles per imperial gallon. The same car shows about 20% higher mpg in UK units than in US units. One mile per imperial gallon equals 0.3540061899 kilometers per liter (km/L).
US gallon per 100 miles (gal/100 mi)
Shown on US EPA fuel-economy labels alongside mpg. It is inversely related to kilometers per liter: km/L = 42.51437074 ÷ value.
Frequently asked questions
What is the formula to convert miles per gallon to US gallons per 100 miles?
gal/100 mi = 120.0949926 ÷ mpg (UK). Miles per gallon and US gallons per 100 miles are inversely related: when one goes up the other goes down. Divide 120.0949926 by the value — do not multiply.
What is 5 miles per gallon (UK) in US gallons per 100 miles?
5 mpg (UK) = 24.01899851 gal/100 mi.
Why is this not a simple multiplication?
One unit measures the quantity directly and the other measures its inverse, so a larger value in one means a smaller value in the other. That is why the formula divides a constant by your value.
Is this mpg (UK) to gal/100 mi converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.
Convert miles per gallon (UK) to other units
- Miles per gallon (UK) to miles per gallon (US)
- Miles per gallon (UK) to liters per 100 kilometers
- Miles per gallon (UK) to kilometers per liter