Travel & Transport
Fuel Range Reserve Buffer Calculator
Safe trip range should be based on usable fuel after a reserve, then reduced for weather, terrain, traffic, towing, or speed. The dashboard’s ideal range can overstate what is available on a difficult route. This calculator also subtracts planned detours so the remaining margin is visible before choosing a fuel stop.
Planning estimate only. Check measurements and real-world constraints before buying materials or making a commitment.
Calculate your scenario
Change any input. Results update immediately.
Your results
Conservative usable range
484 km
After reserve and condition penalty.
Fuel held in reserve
8.3 L
Not counted toward trip range.
Range margin at fuel stop
64 km
The stop is inside the entered buffer.
How the calculation works
The calculator applies this relationship to the inputs above. Keep every measurement in the unit shown.
Worked example
Use this example to check the calculator by hand before relying on a result.
Assumptions behind the result
- • Consumption is expressed in litres per 100 km.
- • Tank capacity and fill level are known.
- • Condition penalty is conservative.
- • Fuel is available at the planned stop.
- • The tool does not replace vehicle warnings.
Mistakes that change the answer
- • Using best-ever fuel economy.
- • Treating the entire tank as usable trip fuel.
- • Ignoring detours and unavailable stations.