How to use the fuel economy calculator
Convert between mpg, L/100 km and km/L. Enter consumption in the field above; the km per litre, miles per gallon (us), miles per gallon (uk) are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- l — Consumption (L/100 km)
Worked example
With consumption = 7 L/100 km, the calculator gives km per litre ≈ 14.28571 km/L; miles per gallon (us) ≈ 33.60214 mpg; miles per gallon (uk) ≈ 40.35443 mpg.
Frequently asked questions
What is the formula for the fuel economy calculation?
km per litre (km/L) = 100 / l. Miles per gallon (US) (mpg) = 235.215 / l. Miles per gallon (UK) (mpg) = 282.481 / l. Here l is consumption (L/100 km).
What inputs do I need for the fuel economy converter calculator?
You need consumption in L/100 km. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.