Compare a route-specific transit, non-cruise and reserve fuel target with verified usable onboard fuel without claiming maximum or safe range.
A quick decision brief for this specific tool
Externally charted route distance, conservative average SOG, measured average GPH, entered non-cruise allowance, selected reserve gallons and verified usable onboard fuel
Transit time/fuel, total entered route-fuel target and explicit usable-fuel gap or surplus
Balances route-specific fuel assumptions; it does not calculate maximum/safe range, approve a route or forecast conditions
Choose your path
Reconcile route-specific transit, non-cruise and reserve fuel with verified usable onboard fuel without claiming maximum or safe range.
Combine charted route distance, conservative average SOG and measured burn.
Enter route-specific transit assumptions plus non-cruise and reserve gallons.
Sees transparent transit hours/fuel and total target rather than a nominal maximum range.
Use measured usable fuel instead of nominal capacity.
Enter verified usable onboard gallons and inspect the exact gap or surplus.
Can investigate uncertainty without treating a static surplus as guaranteed coverage.
Keep route, weather, system condition, reserve policy and monitoring above arithmetic.
Check current official products, file a float plan and monitor fuel/progress/conditions underway.
Turns back or seeks help early instead of relying on the worksheet.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Charted route distance divided by conservative average speed over ground gives entered transit hours; multiplying by measured average GPH gives transit fuel.
Entered non-cruise fuel and selected reserve gallons are added to transit fuel so maneuvering, idle, generator use and reserve policy are not hidden inside an arbitrary percentage.
The total target is compared with verified usable onboard fuel. Nominal capacity, unusable volume and uncertain gauge readings are not treated as guaranteed supply or maximum range.
Updated: August 2026
Enter the actual charted route total, conservative SOG and measured vessel-specific burn to calculate the transit portion of the plan.
Add explicit non-cruise and reserve gallons, then compare the target with measured usable fuel rather than nominal tank capacity.
Use current official route and weather products, inspect the fuel system, file a float plan, and monitor actual fuel, progress and conditions instead of trusting the initial worksheet.
Enter a verified usable quantity that excludes unusable volume and accounts for measurement uncertainty and system condition.
Burn and SOG change with load, trim, sea state, current, wind, maneuvering and routing. Use route-specific scenarios, reserves, contingencies and underway monitoring.
Use this worksheet to compare a transparent charted-route fuel target with verified usable onboard fuel. It is not a maximum-range calculator, ETA, route approval, forecast, seaworthiness finding or permission to depart.
