How fuel cost is calculated
Fuel cost starts with distance, fuel economy, and fuel price. Trip count, vehicles, and route buffer then adjust the total.
Fuel Cost Calculator
Estimate the fuel cost of any trip based on distance and fuel price.
Trip and fuel details
Choose your units and currency, then enter your trip, vehicle and local fuel price details.
Currency selection does not convert prices. Enter the fuel price in your selected currency. USD is only the starting option, not a guess at your location.
Enter your current local fuel price from your petrol station or fuel supplier. Prices vary by location and date.
Estimated total fuel cost (USD)
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Enter your current local fuel price to see an estimate. Prices vary by location and date.
Fuel needed
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Cost per person
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Cost per kilometre
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Cost per mile
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Round-trip setting
One-way
Multiple trips
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Distance used after buffer
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Fuel price used
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Fuel economy used
7.00 L/100 km
Copy result
Copy total cost, fuel needed, distance, cost per person, and trip settings with currency and unit labels.
Fuel economy note
Real fuel economy may differ from rated values because driving conditions vary.
Fuel price note
BlinkCalc never prefills a fuel price. Enter the current price at your local station, as prices vary by location and date.
Trip buffer note
A buffer can help account for detours, stops, route changes, and idling.
No currency conversion
Changing currency only changes labels. No exchange rate is applied, so re-enter or confirm your price.
Driving conditions
Traffic, speed, terrain, cargo load, tire pressure, and weather can affect fuel use.
Local calculation
Inputs are processed in your browser. No fuel price lookup, location detection or exchange-rate service is used.
Dynamic fuel cost insights
Trip setting
This estimate is useful for trip budgeting and comparing route or vehicle choices.
Cost check
Enter your current local fuel price to see a cost. Prices vary by location and date.
Passenger split
Passenger count can help estimate a fair cost split.
Buffer note
For L/100 km, a lower number means better fuel efficiency.
Fuel cost breakdown
Currency
USD (no exchange rate applied)
Base distance
100.00 kilometres
Trip type
One-way
Distance buffer amount
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Final distance used
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Fuel economy
7.00 L/100 km
Fuel needed
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Fuel price
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Total cost
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Cost per kilometre
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Cost per person
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Fuel economy comparison guide
Low efficiency vehicle
10.7 to 15.7 L/100 km
About 15 to 22 MPG (US). Larger vehicles or heavy loads may fall in this range
Average car
6.7 to 9.4 L/100 km
About 25 to 35 MPG (US), or 30 to 42 MPG (UK)
Efficient car
4.7 to 6.7 L/100 km
About 35 to 50 MPG (US). Lower fuel cost for the same distance
Hybrid vehicle
5.2 L/100 km or less
About 45 MPG (US) or more. City efficiency can be strong for many hybrids
Small motorcycle or scooter
3.9 L/100 km or less
About 60 MPG (US) or more. Varies by engine size and riding style
Trip cost planning guide
Short commute
8 to 32 km (5 to 20 miles)
Repeated daily trips can add up quickly
Weekend trip
80 to 320 km (50 to 200 miles)
Useful for simple travel budgeting
Long road trip
480 km (300 miles) plus
Fuel price and route choice matter more
Delivery route
Many stops
Idling and city driving can increase use
Repeated weekly commute
Trip count matters
Multiply by workdays or weekly trips
Fuel cost sensitivity guide
Fuel price rises
Total cost increases directly
A 10% price increase raises fuel cost by about 10%
Fuel economy improves
Fuel needed decreases
Higher MPG or km/L, or lower L/100 km, means less fuel for the same trip
Extra distance
Fuel and cost increase
Detours, stops, and route changes can affect the total
Traffic or hills
Real use may rise
Driving conditions can reduce real-world efficiency
Cost sharing guide
1 passenger
Driver pays full estimate
Useful for solo cost planning
2 passengers
Cost divided by 2
Simple equal split for shared trips
3 passengers
Cost divided by 3
Helpful for group travel
4 passengers
Cost divided by 4
Per-person share drops as riders share cost
Fuel cost guide
These notes explain fuel cost estimates without repeating the calculator result.
Understanding fuel economy units
MPG (US), MPG (UK) and km/L increase as efficiency improves. L/100 km works the opposite way, so lower values are better. MPG (UK) uses the larger imperial gallon, so it reads about 20% higher than MPG (US) for the same car.
One-way vs round-trip cost planning
A round trip doubles the selected distance before trip count is applied. This is useful for commutes and return journeys.
Why real-world fuel economy varies
Speed, traffic, hills, weather, tire pressure, vehicle condition, cargo load, and idling can change actual fuel use.
How to split fuel costs fairly
A simple equal split divides the total fuel estimate by passengers. You may adjust for parking, tolls, or vehicle wear separately.
Limitations of fuel cost calculators
Fuel prices and routes can change. Use today’s local price and your vehicle’s real fuel economy when possible.
Formula
For L/100 km: Fuel Needed (litres) = Distance (km) × L/100 km ÷ 100
For km/L: Fuel Needed (litres) = Distance (km) ÷ km/L
For MPG (US): Fuel Needed (US gallons) = Distance (miles) ÷ MPG (US)
For MPG (UK): Fuel Needed (UK gallons) = Distance (miles) ÷ MPG (UK)
Fuel Cost = Fuel Needed × Fuel Price in the same volume unit
Cost per Person = Total Fuel Cost ÷ Number of Passengers
Variables
- Distance is the trip length before or after round-trip settings.
- Fuel economy describes how efficiently the vehicle uses fuel.
- Fuel price is entered in your selected currency per litre, per US gallon (3.785411784 litres) or per UK gallon (4.54609 litres).
- 1 mile = 1.609344 kilometres. Units are converted exactly and only rounded for display.
- Trip count, vehicle count, buffer, and passengers adjust the final estimate.
Worked example (illustrative price only)
A 100 km one-way trip at 7 L/100 km uses 7 litres. At an example price of 2.00 per litre, the fuel cost is 14.00 in whatever currency that price is in. This is not a real or current market price.
Assumptions
The estimate assumes the entered distance, fuel economy, fuel price, and trip count are close to real conditions.
Limitations
Actual fuel cost may vary due to traffic, speed, terrain, weather, idling, fuel price changes, and vehicle condition.
Frequently asked questions
How do I calculate fuel cost for a trip?
Estimate fuel needed from trip distance and fuel economy, then multiply fuel needed by your current local fuel price.
Why is the fuel price field empty?
Fuel prices vary by country, station, fuel type and date, so BlinkCalc never prefills a price. Enter the current price from your local petrol station or fuel supplier.
Does changing the currency convert my fuel price?
No. Currency selection only changes how amounts are labelled. No exchange rate is applied, so enter the fuel price in the currency you select.
What is the difference between MPG (US) and MPG (UK)?
A US gallon is 3.785411784 litres and a UK imperial gallon is 4.54609 litres. The same car therefore shows a higher MPG (UK) figure than MPG (US): 30 MPG (US) is about 36.03 MPG (UK).
How does L/100 km work?
L/100 km means litres used to travel 100 kilometres. Lower L/100 km means better fuel efficiency. km/L and MPG work the other way: higher is better.
Should I calculate one-way or round-trip fuel cost?
Use one-way for a single direction. Use round-trip when you want the return journey included before trip count is applied.
Why is my actual fuel cost different from the estimate?
Actual cost can vary because of traffic, terrain, speed, tyre pressure, cargo load, idling, weather, route changes, and fuel price changes.
How do I split fuel cost between passengers?
Enter the number of passengers. The calculator divides total fuel cost by passenger count to estimate a fair per-person share.
How do I estimate fuel cost for multiple trips?
Enter the details for one trip, then use the number of trips field to multiply the total.
Can this calculator compare vehicles?
Yes. Run the same distance and fuel price with different fuel economy values to compare estimated trip cost.
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Related reading
Learn the formula, assumptions, examples, or context behind this tool.