Marine & Navigation

Fuel Endurance + Reserve Calculator

Calculate endurance and range after applying reserve fuel policy.

Last validated: 2026-02-14

Fuel Endurance + Reserve Calculator estimates available endurance and range after applying explicit reserve policy. It is useful for coastal and offshore passage planning where usable trip fuel must exclude safety reserve. The tool returns reserve volume, trip fuel, endurance hours, and range at planned speed. Use it to compare conservative vs aggressive reserve policies before departure.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Fuel Inputs

Result

Reserve fuel: 135.00 L

Trip fuel available: 765.00 L

Endurance: 11.77 h

Range: 164.77 nm

How to use this tool

Enter usable fuel onboard, burn rate, reserve percentage, and cruise speed.
Run the calculation to compute reserve fuel and trip-usable fuel.
Review endurance and range outputs and verify they match route plus contingency.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Usable fuel l: 900.0
Burn rate lph: 65.0
Reserve percent: 15.0
Speed kn: 14.0
Reserve fuel l: 135.0
Available trip fuel l: 765.0
Endurance hours: 11.76923076923077
Range nm: 164.76923076923077

Expected Outputs

Usable fuel l: 900
Burn rate lph: 65
Reserve percent: 15
Speed kn: 14

Interpretation

Usable fuel l is 900.0. Use this as a decision input, not as a standalone conclusion.
Burn rate lph is 65.0. Use this as a decision input, not as a standalone conclusion.
Reserve percent is 15.0. Use this as a decision input, not as a standalone conclusion.
Cross-check the result against one alternate input set to validate sensitivity.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Usable fuel l

Burn rate lph

Reserve percent

Speed kn

Reserve fuel l

Available trip fuel l

Endurance hours

Range nm

Scenario B

Usable fuel l

Burn rate lph

Reserve percent

Speed kn

Reserve fuel l

Available trip fuel l

Endurance hours

Range nm

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Fuel Endurance + Reserve Calculator

Input Pattern

Fuel Inputs

Result

How to use this tool

Worked Example

Example Inputs

Expected Outputs

Interpretation

Scenario Compare (A vs B)

Scenario A

Scenario B

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