Fuel Cost Calculator
Trip Estimate
40 L
fuel needed
£60
total cost
≈ 10.6 US gal | £12 per 100 km
Quick Facts
- •Fuel cost = (distance ÷ 100) × L/100km × price/liter
- •1 US gallon = 3.785 L; 1 Imperial gallon = 4.546 L
- •500 km at 8 L/100km = 40 liters
- •Higher speed = higher fuel consumption
Formula
cost = (distance ÷ 100) × L/100km × price per liter
The calculator normalizes all inputs to metric (km, L/100km, price per liter) before computing.
Worked Examples
500 km, 8 L/100km, £1.50/L →
(500 ÷ 100) × 8 = 40 L × £1.50 = £60.00
300 miles, 30 MPG (US), $3.50/gal →
300 ÷ 30 = 10 gal × $3.50 = $35.00
Related Tools
Frequently Asked Questions
How do I calculate fuel cost for a trip?
Fuel cost = (distance ÷ economy) × fuel price. Convert units as needed.
Is US gallon the same as UK gallon?
No. 1 US gallon = 3.785 L. 1 Imperial gallon = 4.546 L. Always check which is used.
How much fuel does a 500 km trip at 8 L/100km use?
(500 ÷ 100) × 8 = 40 liters.
How do I convert MPG to L/100km?
L/100km = 235.215 ÷ MPG (US) or 282.481 ÷ MPG (UK).
What is good fuel economy?
Under 6 L/100km (over 40 MPG US) is efficient. Hybrids do 3–5 L/100km.
Does driving speed affect fuel economy?
Yes. Most cars are most efficient at 50–80 km/h. Fuel consumption increases significantly above 100 km/h.