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Fuel Cost Calculator

Calculate trip fuel cost from distance, fuel consumption, and gas price — with round-trip, carpool split, and multi-stop support

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Multi-Stop Trip

About This Tool

Planning a road trip? This calculator tells you exactly how much fuel will cost. Enter the distance, your vehicle's fuel consumption, and the current gas price — and get the total cost instantly. Works with both metric (km, L/100km, $/L) and imperial (miles, MPG, $/gallon) units. Enable round-trip to double the distance automatically. Split the cost between passengers for carpooling. Add multiple stops to plan a full road trip with individual leg costs. Bookmark this for your next trip — whether it's a daily commute, weekend getaway, or cross-country adventure.

How to Use

1. Enter the distance (one-way) 2. Enter your vehicle's fuel consumption (L/100km or MPG) 3. Enter the current fuel price per liter or gallon 4. Toggle "Round trip" if you're coming back 5. Add passengers to split the cost 6. Click "Add Stop" for multi-leg trips 7. See total fuel needed, cost, and cost per person

Frequently Asked Questions

How do I calculate fuel cost for a trip?
Use this formula: Fuel Cost = (Distance ÷ Fuel Efficiency) × Fuel Price. For metric: (km ÷ 100) × (L/100km) × ($/L). For imperial: (miles ÷ MPG) × ($/gallon). This calculator does it automatically for both unit systems.
What is L/100km and how does it relate to MPG?
L/100km (liters per 100 kilometers) is the metric fuel consumption standard used in Europe, Canada, and Australia. Lower is better. To convert: MPG = 235.215 ÷ L/100km. For example, 8 L/100km ≈ 29 MPG, and 30 MPG ≈ 7.8 L/100km.
What's the average fuel consumption for a car?
It varies widely: compact cars average 6-8 L/100km (30-40 MPG), midsize sedans 8-10 L/100km (24-30 MPG), SUVs 10-13 L/100km (18-24 MPG), and trucks 12-16 L/100km (15-20 MPG). Check your owner's manual or look up your specific model.
How do I find my car's actual fuel consumption?
Fill your tank completely, reset the trip odometer, drive normally until nearly empty, fill up again and note the liters/gallons added. Divide distance driven by fuel used. For L/100km: (liters × 100) ÷ km. For MPG: miles ÷ gallons.
Does driving speed affect fuel cost?
Yes, significantly. Most cars are most efficient at 50-80 km/h (30-50 mph). Above 100 km/h (60 mph), fuel consumption increases rapidly due to air resistance. Driving at 120 km/h vs 100 km/h can use 20-25% more fuel.
How can I reduce fuel costs?
Maintain steady speed, avoid hard acceleration/braking, keep tires properly inflated, remove excess weight, use cruise control on highways, avoid idling, and plan routes to minimize distance. Carpooling also cuts cost per person dramatically.

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