Gas MPG Calculator

Formatting only. This does not change the calculation.
Choose "distance and fuel used" to work economy out from a tank fill.
Used when converting an existing figure.
Odometer difference between two fill-ups. Used in "distance and fuel used" mode, and as the trip length when converting.
Volume needed to refill the tank after that distance.
Price per unit of the fuel volume unit above (per US gallon, per imperial gallon or per litre).
Converted economy
29.4018
Fuel Economy Converter and MPG Calculator
Converted unit
Miles per US gallon (mpg, US)
Miles per US gallon
29.4018 mpg
Miles per imperial gallon
35.3101 mpg
Kilometres per litre
12.5000 km/L
Litres per 100 km
8.0000 L/100km
Miles per litre
7.7671 mi/L
Kilometres per US gallon
47.3176 km/gal
US gallons per mile
0.034011 gal/mi
US gallons per 100 miles
3.4011 gal/100 mi
Fuel volume unit
US gallons
Worked out from NIST Handbook 44, Appendix C - General Tables of Units of Measurement and 3 other sources.

How this is worked out

2 steps
  1. 8 Litres per 100 kilometres (L/100km) = 12.5 km/L.
  2. 12.5 km/L = 29.401823 mpg-us.

Results are general information, not financial, tax, legal, medical or engineering advice.