Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Kilometres per litre to Miles per imperial gallon
Convert km/L to mpg (imp) instantly, then review the formula, assumptions, and rounding guidance.
Fuel consumption & efficiencyInstant result
Decimals
Formula Convert km/L to litres per 100 kilometres, then convert to mpg (imp). 1 km/L = 2.8248 mpg (imp)
Common examples
One value, several units
Litres per 100 kilometres100 L/100 km
Miles per US gallon2.3521 mpg (US)
Miles per imperial gallon2.8248 mpg (imp)
Conversion table
| km/L | mpg (imp) |
|---|---|
| 1 km/L | 2.8248 mpg (imp) |
| 2 km/L | 5.6496 mpg (imp) |
| 5 km/L | 14.124 mpg (imp) |
| 10 km/L | 28.2481 mpg (imp) |
| 25 km/L | 70.6202 mpg (imp) |
| 50 km/L | 141.2405 mpg (imp) |
| 100 km/L | 282.4809 mpg (imp) |
Conversion chart
1 km/L2.8248 mpg (imp)
5 km/L14.124 mpg (imp)
10 km/L28.2481 mpg (imp)
25 km/L70.6202 mpg (imp)
50 km/L141.2405 mpg (imp)
Worked example
8 L/100 km is approximately 29.4 US mpg.
Unit definition
Kilometres per litre (km/L) This unit is defined through the displayed non-linear relationship to litres per 100 kilometres.
Unit history
Kilometres per litre is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert km/L to litres per 100 kilometres.
3. Convert the base value to mpg (imp) and apply your display precision.
Important
Fuel economy and fuel consumption are reciprocal measures; zero is not a valid input.
Understand the result before using it
Kilometres per litre to Miles per imperial gallon converts a value measured in Kilometres per litre (km/L) into the equivalent value in Miles per imperial gallon (mpg (imp)). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
Convert km/L to litres per 100 kilometres, then convert the base value to mpg (imp).
Assumptions
- Kilometres per litre and Miles per imperial gallon represent the same fuel consumption & efficiency quantity.
- The input is expressed in km/L; the output is expressed in mpg (imp).
- Fuel economy and fuel consumption are reciprocal measures; zero is not a valid input.
Worked example
1 km/L = 2.82480936 mpg (imp). For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a km/L measurement in a document that expects mpg (imp).
- Compare a kilometres per litre value with a value reported in miles per imperial gallon.
- Check the km/L-to-mpg (imp) arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Fuel consumption and fuel economy are reciprocal; zero and negative values are not physically valid inputs.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Kilometres per litre to Miles per imperial gallon?
Convert km/L to litres per 100 kilometres, then convert the base value to mpg (imp). Using the displayed relationship, 1 km/L equals 2.82480936 mpg (imp).
How many Miles per imperial gallon are in one Kilometres per litre?
One Kilometres per litre is 2.82480936 Miles per imperial gallon. The displayed digits may be rounded.
Can I reverse the km/L to mpg (imp) conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts mpg (imp) back to km/L.
Is the Kilometres per litre to Miles per imperial gallon result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.