Fuel Economy Converter
Convert US MPG, Imperial MPG, km/L and liters per 100 km using their reciprocal relationship.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Normalize to liters consumed per 100 km, then invert for distance-per-volume efficiency units.
L/100 km=(100×liters per gallon)/(kilometers per mile×MPG)
Worked example
30 US MPG corresponds to about 7.84048611 L/100 km and 36.0284978 Imperial MPG.
Assumptions and input details
All values must be positive because zero cannot be reciprocally converted. US liquid and Imperial gallons remain separate. These are equivalent constant-efficiency descriptions, without a trip, driving-cycle estimate, fuel cost or electric MPGe conversion.
References: NIST Guide to the SI: conversion factors
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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