When to use this calculator
Split journey fuel spending equally across travellers. Fuel only; tolls, parking, maintenance and depreciation are excluded.
Explore the journey time & travel budget calculators for other questions in this topic. For a related calculation, use the Journey Time Calculator: Estimate moving time from distance and average speed.
PUTTING IT INTO PRACTICE
Carpool Cost: 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 |
|---|---|
| Distance (km) | 300 |
| Consumption (L/100 km) | 7 |
| Price per litre | 1.5 |
| Travellers (integer) | 3 |
| Result | 10.5 per person |
- Check the input labels and enter the example values above.
- Apply the relationship: Each share = distance × consumption/100 × fuel price ÷ travellers.
- The result is 10.5 per person, rounded for display.
How to interpret your result
Fuel only; tolls, parking, maintenance and depreciation are excluded.
Average speeds should include the delays relevant to your question. Equal-distance and equal-time speed averages use different methods. Compare trip budgets with consistent expense categories and journey boundaries.
Frequently asked questions
Why is average speed for equal-distance legs not a simple average?
More time is spent on the slower leg. Divide total distance by total travel time, which produces the harmonic mean for two equal-distance legs.
How do I use the carpool cost calculator?
Enter distance (km), consumption (l/100 km), price per litre, travellers (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Each share = distance × consumption/100 × fuel price ÷ travellers.
What should I check before using the result?
Fuel only; tolls, parking, maintenance and depreciation are excluded.
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.
Calculators Map editorial process · Updated · Methods and limitations