Fuel Cost Calculator

What the Fuel Cost Calculator Does

This tool estimates the fuel for a journey and what you will pay for it. Give it how far you are going, how many kilometres your vehicle does per litre, and the price of fuel, and it returns the litres required and the cost.

It is the quick way to budget a road trip, compare the running cost of two routes, or work out your share of fuel for a shared journey.

How It Works

The tool divides the distance by the efficiency to find how many litres the trip needs — a longer distance or a less efficient vehicle needs more fuel. It then multiplies those litres by the price per litre to give the total cost.

Efficiency is entered as kilometres per litre, so a bigger number means the vehicle goes further on each litre and needs less fuel. The whole calculation is two simple steps: fuel needed, then fuel cost.

Methodology

1. Read the inputs. Take the distance, the efficiency in km per litre, and the fuel price per litre.
2. Find the fuel needed. Divide the distance by the efficiency to get the litres required.
3. Calculate the cost. Multiply the litres by the price per litre.
4. Show both figures. Display the fuel needed and the total cost.

Fuel needed and cost

Efficiency is kilometres per litre, where higher is more efficient — not litres per 100 km (where lower is better) or miles per gallon. The distance is one-way; double it for a round trip.

Assumptions

• Efficiency is constant for the whole trip; in reality it changes with traffic, speed, air-conditioning, load and terrain, so treat the result as an estimate.
• Efficiency is in kilometres per litre, where a higher number is better — distinct from litres per 100 km or miles per gallon.
• The distance is one-way; for a return journey, enter the round-trip distance or double the result.

Standards & references

• Kilometres per litre — A distance-per-fuel measure used in much of Asia, where a higher number means better efficiency. It is the inverse of litres per 100 km, where lower is better.
• Fuel economy units differ — Kilometres per litre, litres per 100 km and miles per gallon all measure efficiency differently. Mixing them up gives wrong results, so enter efficiency in km per litre here.
• Real-world variation — Quoted fuel economy is measured under test conditions. Actual consumption varies with driving style, traffic, weather, load and terrain, so a trip estimate is approximate.

Accuracy & Limitations

The litres and cost are computed exactly from the distance, efficiency and price you enter, so the arithmetic is precise for those figures.

It assumes a constant efficiency, which the real world does not provide. City traffic, high speeds, air-conditioning, a heavy load and hilly terrain all raise consumption, so a real trip may use more fuel than the estimate.

Efficiency must be entered as kilometres per litre, where higher is better. If you have a litres-per-100-km or miles-per-gallon figure, convert it first, or the result will be wrong.

The distance is taken as one-way. For a return trip, double the distance or the resulting cost, since the tool calculates a single journey.

Real-World Use Cases

When to use it — and when not to

If your efficiency figure is litres per 100 km or miles per gallon, convert it to km per litre first. For total travel cost, add tolls and parking separately. This tool estimates fuel only.

Frequently Asked Questions

References

• Fuel economy in automobiles (Wikipedia)
• Fuel efficiency (Wikipedia)
• Fuel economy — units and conversion (Wikipedia)

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