When to use this calculator
Find litres used per 100 kilometres travelled. Use fuel consumed over the measured distance, such as a consistent full-to-full measurement.
Explore the fuel use & cost calculators for other questions in this topic. For a related calculation, use the Fuel Cost Calculator: Estimate fuel spending from trip distance, consumption and fuel price.
PUTTING IT INTO PRACTICE
Fuel Consumption: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Fuel used (L) | 35 |
| Distance travelled (km) | 500 |
| Result | 7 L/100 km |
- Check the input labels and enter the example values above.
- Apply the relationship: Consumption = litres ÷ kilometres × 100.
- The result is 7 L/100 km, rounded for display.
How to interpret your result
Use fuel consumed over the measured distance, such as a consistent full-to-full measurement.
State the fuel-economy convention: UK imperial and US liquid gallons have different volumes. L/100 km is consumption, so lower values indicate less fuel used per distance. Input prices are scenario values.
Frequently asked questions
Are UK MPG and US MPG comparable without conversion?
No. Both use miles but different gallon volumes, so their numerical values differ for the same vehicle consumption.
How do I use the fuel consumption calculator?
Enter fuel used (l), distance travelled (km). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Consumption = litres ÷ kilometres × 100.
What should I check before using the result?
Use fuel consumed over the measured distance, such as a consistent full-to-full measurement.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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