How Fuel Consumption Calculator Works?
This tool works by dividing the distance of your drive by your vehicle's miles per gallon (MPG). The result is the number of gallons needed to finish the drive.
Enter the total distance
Type the full distance in miles. Convert kilometers by multiplying by 0.621, so 724 km becomes 450 miles.
Enter the fuel efficiency
Type the MPG rating. Use the highway rating for interstate drives and the city rating for urban routes.
Read the gallons needed
The tool returns the gallons of fuel the drive burns, rounded to 2 decimals.
Compare with your tank size
Check the result against your tank capacity to see whether you need a refuel stop.
Fuel Consumption Calculator Formula
The formula is Fuel Needed (gallons) = Distance ÷ MPG. The formula returns volume, not cost.
Fuel Needed = Distance ÷ MPGFormula variables
- Distance
- Miles to be driven. 1 mile equals 1.609 kilometers.
- MPG
- Miles per US gallon for the vehicle and road type.
- Fuel Needed
- US gallons consumed. Multiply by 3.785 to get liters.
Worked example
- Total Distance: 450 miles
- Fuel Efficiency: 28 MPG
- Divide 450 miles (724 km) by 28 MPG: 450 ÷ 28 = 16.07 gallons.
- Convert to liters: 16.07 × 3.785 = 60.8 liters.
Result: 16.07 (gallons)
A 16-gallon (60.6 L) tank on a 28 MPG car runs out just short of 450 miles, so a drive of that length needs a fuel stop or a full tank plus a top-up.
Fuel Consumption Calculator Conversion Table
The table lists gallons needed for 5 distances at 4 MPG ratings. Multiply any figure by 3.785 for liters.
Rows: Total Distance (miles). Columns: Fuel Efficiency (MPG). Cells: gallons.
| miles | 20 MPG | 28 MPG | 35 MPG | 45 MPG |
|---|---|---|---|---|
| 100 miles | 5.00 | 3.57 | 2.86 | 2.22 |
| 250 miles | 12.50 | 8.93 | 7.14 | 5.56 |
| 450 miles | 22.50 | 16.07 | 12.86 | 10.00 |
| 750 miles | 37.50 | 26.79 | 21.43 | 16.67 |
| 1,000 miles | 50.00 | 35.71 | 28.57 | 22.22 |
A 1,000-mile (1,609 km) drive consumes 50 gallons (189 L) at 20 MPG and 22.22 gallons (84 L) at 45 MPG.
What is Fuel Consumption Calculator?
The Fuel Consumption Calculator is a tool that estimates how many gallons of fuel a drive uses. The tool works for road trips, commutes, and delivery routes.
Fuel consumption is the volume of fuel burned over a distance. US drivers measure consumption in gallons, while drivers in Europe, Canada, and Australia measure consumption in liters per 100 kilometers (L/100km).
The calculator answers a planning question: how much fuel does the trip need? Knowing the volume helps drivers plan refuel stops, fill jerry cans for remote areas, and check whether one tank covers the route.
What are the uses of Fuel Consumption Calculator?
There are 4 main uses of the Fuel Consumption Calculator: planning refuel stops, sizing fuel reserves, estimating generator and boat fuel, and auditing fuel cards.
Planning refuel stops
Drivers compare gallons needed with tank capacity to decide where to stop on long highways.
Sizing fuel reserves
Off-road and rural drivers calculate how many 5-gallon (18.9 L) cans to carry when stations are far apart.
Estimating vehicle fuel orders
Fleet managers forecast the gallons a route uses before ordering bulk fuel.
Auditing fuel cards
Business owners compare expected gallons with fuel card purchases to catch unusual spending.
Need every metric in one place? Open the main MPG Cost Calculator or browse all 101 fuel calculators.