Fuel Cost Calculator
Estimate how much fuel your journey will use and what it will cost.
km
km/L
per L
- 1
Fuel needed
300 km ÷ 15 km/L = 20Distance divided by fuel efficiency gives the litres required. - 2
Total fuel cost
20 L × 100 = 2,000
Formula
How this is calculated
The calculator works from three inputs. Distance is how far you plan to drive, in kilometres. Fuel efficiency is your vehicle's consumption expressed as kilometres travelled per litre (km/L) — a larger number means the car goes further on each litre. Fuel price is the cost of one litre of petrol or diesel in your local currency.
It runs the calculation in two steps. First it divides distance by efficiency to find the litres of fuel the trip needs: Litres = Distance ÷ Efficiency. Then it multiplies those litres by the price per litre to get the total cost: Cost = Litres × Price. It also reports cost per kilometre by dividing the total cost back by the distance, which is handy for comparing trips of different lengths.
Efficiency must be greater than zero, otherwise the result is undefined. The estimate assumes one steady consumption figure for the whole journey, so it ignores how real driving changes mileage — city stop-start traffic, heavy loads, hills, high speed and air conditioning all burn more fuel. If your efficiency is quoted as litres per 100 km instead, convert it first with km/L = 100 ÷ (L/100 km). Treat the figure as a close planning estimate, not an exact fuel bill.
About this calculator
This calculator turns three simple numbers — trip distance, your vehicle's fuel efficiency, and the current price per litre — into the total fuel cost of a journey. Divide the distance by the efficiency (in km per litre) to find how many litres you will burn, then multiply by the pump price.
If your efficiency is quoted as litres per 100 km, convert it first: km/L = 100 ÷ (L/100 km). Real-world consumption varies with speed, load, traffic and terrain, so treat the result as a close planning estimate rather than an exact figure.
Frequently asked questions
Kilometres travelled per litre of fuel. A higher number means a more efficient, cheaper-to-run vehicle.
Divide 100 by the L/100 km figure. For example, 6.7 L/100 km equals about 15 km/L.
City driving, heavy loads, hills and air conditioning all reduce efficiency, so actual cost can be higher than the estimate.
Also known as
TG we-Calculate Editorial Team. (2026). Fuel Cost Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/fuel-cost-calculator
TG we-Calculate Editorial Team. "Fuel Cost Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/fuel-cost-calculator.
TG we-Calculate Editorial Team, "Fuel Cost Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/fuel-cost-calculator
@misc{wecalculate_fuel_cost_calculator, title = {Fuel Cost Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/fuel-cost-calculator}}, year = {2026}, note = {TG we-Calculate} }
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