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Fuel Economy Converter
Quickly calculate your fuel economy by entering your required values.
Fuel Economy Converter
Enter values CalculateResult
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What is this calculator?
Convert your fuel economy between US MPG, Imperial MPG, L/100km, and km/L. Be aware that the US and UK use different gallon measurements.
What is the difference?
A US gallon is 3.785 liters, while an Imperial (UK) gallon is 4.546 liters. Therefore, 30 Imperial MPG is not the same efficiency as 30 US MPG.
How to use this calculator
Select your MPG system (US or Imperial) and enter your fuel economy to view the conversions.
Formula / Calculation Method
For US MPG:
- L/100km = 235.214583 / US MPG
- km/L = US MPG × 0.425144
For Imperial (UK) MPG:
- L/100km = 282.480936 / Imperial MPG
- km/L = Imperial MPG × 0.354006
Worked Example
Calculation scenario for standard conversions:
Inputs:
- Fuel Economy Unit: US MPG
- MPG (US): 100
Calculated Result:
- Main Result: 100 US MPG
- L/100km: 2.35
- km/L: 42.51
Frequently asked questions
Are real-world efficiency losses factored in?
Basic mathematical models assume ideal conditions unless an efficiency/loss variable is specifically requested in the form.
Can I use this for commercial sizing?
This provides a strong initial estimate, but commercial implementations require professional on-site engineering assessments.