Fuel Cost Calculator
Work out how much fuel a trip will cost based on distance, fuel efficiency, and current fuel price. Supports both imperial (miles/MPG) and metric (km/L per 100km) units.
Units
Journey details
Cost estimate
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Total fuel cost
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Fuel used
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Cost per 100 mi
Tips to Reduce Fuel Costs
- Maintain correct tyre pressure: Under-inflated tyres increase rolling resistance and can reduce fuel economy by up to 3%.
- Drive smoothly: Aggressive acceleration and hard braking waste fuel. Anticipate traffic and brake gently.
- Remove roof racks when not in use: Aerodynamic drag significantly increases fuel consumption at motorway speeds.
- Use air conditioning wisely: At low speeds, open windows are more efficient. At high speeds, A/C creates less drag than open windows.
- Keep up with servicing: A well-tuned engine burns fuel more efficiently. Air filters, spark plugs, and fresh oil all help.
Frequently Asked Questions
Fuel cost = (distance ÷ fuel efficiency) × fuel price. For MPG: cost = (miles ÷ MPG) × price per gallon. For L/100km: cost = (km × L/100km ÷ 100) × price per litre.
A fuel-efficient petrol car typically achieves 35–45 MPG. Hybrids achieve 50–60 MPG, diesel cars 40–55 MPG, and older or larger vehicles may only reach 20–30 MPG.
Lower is better for L/100km. Efficient petrol cars achieve 5–7 L/100km. Hybrids can reach 3–5 L/100km. SUVs and older vehicles may use 8–14 L/100km.
Use the formula: L/100km = 282.48 ÷ MPG (for UK imperial gallons) or 235.21 ÷ MPG (for US gallons). Our MPG Calculator tool handles this conversion automatically.