Fuel Range Calculator
Estimate driving range from tank capacity, current fuel level, fuel economy and reserve
Usable driving range
How we calculated it
About the Fuel Range Calculator
Fuel range estimates how far a vehicle can travel from available fuel and expected fuel economy. It is useful for trip planning and checking whether a route can be completed before refuelling.
Dashboard range estimates can differ because real fuel economy changes with speed, terrain, weather, idling and load.
How to Use the Fuel Range Calculator
- Enter usable fuel quantity.
- Enter expected fuel economy.
- Choose compatible units.
- Calculate range and keep a reserve rather than planning to use every last unit of fuel.
How the Calculation Works
For distance-per-volume fuel economy such as MPG or km/L, estimated range = usable fuel quantity × fuel economy. Both quantities are converted to compatible units before multiplication.
For fuel-per-distance formats such as L/100 km, estimated range = usable fuel litres ÷ consumption rate × 100 km. Because this format is reciprocal, a lower L/100 km value produces a longer range for the same amount of fuel.
Worked example
Fuel Range Calculator Worked Example
15 gallons at 28 MPG
Range = 15×28 = 420 miles in the ideal average-economy model.
Result guide
Understanding Your Fuel Range Calculator Result
The result is an estimated maximum under the entered economy. Practical route planning should use a lower usable range to preserve reserve fuel. Tire pressure, roof loads, towing and strong headwinds can all reduce the real distance available from a tank. If those conditions are expected, use a more conservative economy figure rather than adding optimism to the calculated range.
Before you rely on the answer
Assumptions and Limitations
- Fuel economy is representative of the trip.
- Fuel quantity is actually usable.
- Detours, idling and changing road conditions are reflected only indirectly through the economy assumption.
Practical tip
Using This Result in Practice
On remote routes, calculate a reserve explicitly instead of treating empty-tank range as the target. Fuel availability can be as important as the arithmetic. If the vehicle has a reserve segment that is not intended for routine use, subtract that reserve from the fuel quantity before estimating practical range rather than multiplying the full tank capacity by economy.
Related calculations
Useful Calculations to Continue With
If you know the trip distance and want the fuel required instead, use the Trip Fuel Calculator.
If economy is reported in an unfamiliar unit, convert it first with the Fuel Economy Converter.
Common questions
Fuel Range Calculator FAQ
How do I calculate fuel range from MPG?
Multiply usable gallons by miles per gallon.
Why is actual range often lower?
Traffic, terrain, weather, load and speed can reduce real fuel economy.
Should I plan to use the full calculated range?
Usually no. Keep a safety reserve, especially where refuelling options are limited.