⛽ Fuel Cost Calculator
Estimate how much gas you'll need — and what it'll cost.
Estimated Fuel Cost
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gallons needed
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cost per mile
Round Trip Estimate
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gallons
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total cost
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Unit Flexible
MPG, km/L, or L/100km. Miles or kilometers. Gallons or liters. Your choice.
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Round Trip
Automatically shows double the fuel and cost for return trips.
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Instant Results
Results update as you type — no button needed.
Frequently Asked Questions
How is the fuel cost calculated?
The formula is simple: (Distance / Fuel Efficiency) x Price per Unit = Total Cost. All unit conversions are handled automatically so you can mix and match freely.
What does L/100km mean?
L/100km (liters per 100 kilometers) is how many countries measure fuel efficiency. A lower number means better efficiency. For example, 8 L/100km means the car uses 8 liters to travel 100 km.
Can I use this for road trip planning?
Absolutely! Enter the total trip distance, your car's fuel efficiency (check your owner's manual), and the local gas price to get an accurate estimate of your fuel budget.
How do I find my car's fuel efficiency?
Check your car's owner's manual, the sticker on the driver's side door, or look it up on fueleconomy.gov for US vehicles. Real-world efficiency may vary based on driving conditions.
Is my data stored anywhere?
No. All calculations happen locally in your browser using JavaScript. Nothing is sent to any server.
About Fuel Cost Calculator
Planning a road trip or just curious how much your daily commute costs in gas? This calculator gives you an instant estimate based on your trip distance, vehicle fuel efficiency, and local gas price. It supports both imperial and metric units.
How to Use
- Enter your trip distance in miles or kilometers
- Input your vehicle's fuel efficiency (MPG, km/L, or L/100km)
- Set the current fuel price per gallon or per liter
- See instant results — no button needed