Quick guide
How to use this calculator
- Choose the real journey or motion relationship first, then enter only the measurements that belong to that mode.
- Keep every distance, speed, duration, clock, direction, break, reserve, wind, or current convention explicit; the calculator normalizes compatible units internally.
- Use the companion outputs to reconcile the scenario, then retain the stated limits before using an estimate for a real journey.
Calculation method
How the travel range and endurance calculator works
Convert a visitor-known endurance into conservative planning distances without guessing fuel, battery, consumption, or regulatory reserve rules.
Usable travel time = total endurance − reserve; maximum one-way range = speed × usable time; equal-speed out-and-back turnaround distance is half that range.
Worked example
Travel Range and Endurance example
At 18 knots with 6 hours total endurance and a 1-hour reserve, usable endurance is 5 hours, one-way range is 90 nmi, and equal-speed turnaround distance is 45 nmi.
Usable travel time = total endurance − reserve; maximum one-way range = speed × usable time; equal-speed out-and-back turnaround distance is half that range.
Supported inputs
Precision and limits
Scenario boundary
This neutral time–speed scenario does not estimate fuel or battery use, account for changing conditions, or establish an aviation, marine, workplace, or legal reserve. Use approved vehicle/vessel data and applicable requirements.
Precision and time
Calculations retain working precision and round durations to the nearest second and clock outputs to the nearest minute. Entered averages and schedules remain assumptions, not live observations or guarantees.
Category ownership
This calculator handles neutral travel, timing, range, or relative-motion arithmetic. Vehicle operating cost and performance belong in Automotive; competition pacing belongs in Sports; time zones belong in Dates & Times; route geography belongs in Travel & Geography; advanced dynamics belong in Engineering & Science.
Privacy
Entered locations are not requested. Entered values and results stay in this browser and are not sent to analytics or third parties.
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