Fuel Cost Calculator
Estimate the fuel cost of a trip from distance, efficiency, and fuel price.
Inputs
Total Fuel Cost
$35.00
Fuel Used (gal / L)
10.00
Cost per Mile / km
$0.117
Step by step
Calculate fuel used (distance ÷ MPG)
300 mi ÷ 30.0 MPG
= 10.00 gal
Multiply fuel used by price per gal
10.00 gal × $3.50/gal
= $35.00
Cost per mi
$35.00 ÷ 300 mi
= $0.117/mi
How it works
In imperial units, fuel used equals distance divided by miles-per-gallon; in metric, it's the distance in hundreds of kilometers times your L/100km figure. Multiply by fuel price for the total trip cost.
Formulas
Imperial (MPG)
Fuel (gal) = Distance (mi) ÷ MPG Cost = Fuel × price per gallon
- d
- Trip distance in miles
- MPG
- Miles per gallon fuel efficiency
- p
- Price per gallon
Metric (L/100 km)
Fuel (L) = (Distance (km) ÷ 100) × L/100km Cost = Fuel × price per litre
- d
- Trip distance in kilometres
- L/100km
- Fuel consumption in litres per 100 km
- p
- Price per litre
Frequently Asked Questions
Where do I find my fuel efficiency?
Check your vehicle's trip computer or manufacturer rating. In the U.S. it's miles per gallon (MPG); in much of the world it's liters per 100 km.
Can I estimate a round trip?
Yes — just enter the total distance for the whole journey, including the return leg.