Enter real fuel efficiency and a local petrol price to find fuel cost per km, cost per 100 km, litres used per kilometre, and the fuel expense for any distance.
Cost per km
0
Cost per 100 km
0
Fuel per km
0.080 L
100 km trip
0 · 8 L
Fuel-only estimate. Currency exchange, maintenance, tolls, depreciation, and other ownership costs are not included.
Formula and example
Petrol cost formula
Cost/km = (Price ÷ Mileage)
For example, a vehicle returning 12.5 km/L on a 150 km trip. Let P be your entered price per litre.
Fuel per km
1 ÷ 12.5
0.08 L
Cost per km
P ÷ 12.5
Your rate
Trip cost
(150 ÷ 12.5) × P
Your total
Illustrative reference
Typical economy ranges next to the petrol each vehicle uses on a 30 km trip, and what that fuel costs per day and per month. Use your own measured mileage for a result that reflects your vehicle.
Detecting your currency — pick one manually if you prefer.
Use the current pump price in your currency. It is not fetched automatically.
Vehicle
km/L| Vehicle | Fuel economy | Fuel / day | Cost / day | Cost / month |
|---|---|---|---|---|
| Light commuter bike | 55–65 | 0.50 L | — | — |
| Standard commuter bike | 45–50 | 0.63 L | — | — |
| Mid-size commuter bike | 45–50 | 0.63 L | — | — |
| Sport commuter bike | 40–45 | 0.71 L | — | — |
| Larger commuter bike | 38–42 | 0.75 L | — | — |
| Light city scooter | 50–55 | 0.57 L | — | — |
| Comfort scooter | 42–48 | 0.67 L | — | — |
| Urban scooter | 48–52 | 0.60 L | — | — |
| Compact hatchback | 18–22 | 1.50 L | — | — |
| Small family car | 14–17 | 1.94 L | — | — |
| Mid-size sedan | 12–15 | 2.22 L | — | — |
| Compact sedan | 13–16 | 2.07 L | — | — |
| Large sedan | 11–13 | 2.50 L | — | — |
| Large SUV | 8–10 | 3.33 L | — | — |
| Pickup truck | 9–12 | 2.86 L | — | — |
| Compact SUV | 12–14 | 2.31 L | — | — |
Based on a 30 km trip using the midpoint of each economy range. Add a petrol price to see daily and monthly cost.
How to use it
Enter real fuel efficiency and select km/L or L/100 km. Enter the current petrol price per litre in your currency. Optionally enter a journey distance in kilometres. Review fuel cost per km, cost per 100 km, fuel per km, and trip cost.
Currency is a label: no exchange-rate conversion occurs. For a representative result, use consumption measured under driving conditions similar to the planned route.
Enter any journey distance to turn cost per km into a total fuel expense.
Re-enter the pump price whenever it changes instead of reusing a stale figure.
Run each vehicle separately and compare their per-kilometre results.
Per-km fuel guide
km/L describes distance travelled on one litre. L/100 km describes litres consumed across 100 kilometres. A reading of 12.5 km/L equals 8 L/100 km.
Multiply US MPG by 0.425144 or Imperial MPG by 0.354006. One US gallon is 3.785411784 litres, one Imperial gallon is 4.54609 litres, and one mile is 1.609344 kilometres. Do not treat US and Imperial MPG as identical.
Fuel price
A price rise changes cost per km even if consumption remains unchanged.
Traffic and route
Idling, stop-start traffic, hills, rough roads, wind, and short journeys can increase consumption.
Vehicle and load
Tyre pressure, maintenance, engine condition, passengers, cargo, roof racks, and towing affect efficiency.
Driving behaviour
High speeds, harsh acceleration, heavy braking, and unnecessary idling can use more fuel.
This fuel cost calculator assumes the entered mileage and petrol price apply across the distance. It does not predict live fuel prices or automatically adjust for route conditions, measurement error, price changes, or fuel quality. Results are estimates, not invoices or reimbursement rates.
This page targets petrol cost per kilometre and per 100 km. For miles, use the planned cost-per-mile tool; for fuel required and passenger sharing on a route, use the trip petrol calculator. For broad vehicle petrol expense, use the general petrol calculator. These boundaries avoid duplicating those calculators' search intent.
The tool converts the selected efficiency to litres per kilometre, multiplies by the entered price, and retains full JavaScript numeric precision until results are displayed. It does not call a fuel-price or currency API.
Read the petrol expense formula guide and calculation methodology. Last reviewed: 17 September 2026.
FAQ
Answers about petrol cost per km, mileage units, conversions, and real-world estimates.
More calculators
The universal calculator handles most cases, while dedicated tools cover specific vehicles, budgets, comparisons, trips, and professional driving needs.
Petrol cost calculator for motorcycles and scooters. Estimate daily, monthly, and trip costs in seconds.
Petrol cost calculator for scooters and small motorcycles using your own local inputs.
Petrol cost calculator for sedans, hatchbacks, and compact family cars.
Petrol cost calculator for SUVs, pickups, and other larger vehicles.
Calculate another route
Change the measured efficiency, local petrol price, or journey distance whenever your driving conditions change.