Import a multi-waypoint route or enter mission phases directly, with separate wind, true airspeed and fuel flow per distance leg. Automatically update total time, fuel required and reserve margins while retaining ground, on-station and landing phases and recorded fuel checks.
Start here
- Choose a quick estimate or a full mission plan below. A received route is reviewed before it changes your phases.
- Set starting fuel, unusable fuel and reserve. For a mission, review each phase in order and its own flow, speed and wind.
- Calculate or enable automatic updates, then read required loaded fuel and the margin after your reserve.
How to read the results
Required loaded fuel includes the entered unusable fuel and reserve policy. Fuel margin compares your starting fuel with planned burn and protected fuel; a negative margin means the entered plan is short.
Quick: one representative fuel flow. Full mission: ordered phases, separate leg conditions and fuel checkpoints.
Optional aircraft profile: Manual values
Build a multi-waypoint route, then review its legs here alongside ground, climb, on-station and landing phases.
Mission Fuel Planner and Endurance Calculator
Planning output only. Verify assumptions and results against authoritative data, manufacturer information, approved procedures, test evidence and competent engineering or regulatory review before use.
Calculation basis
Quick mode removes unusable fuel and the entered reserve, then divides available fuel by representative flow. Mission mode sums fuel flow multiplied by phase time across all phases. Import an ordered waypoint route after reviewing the existing phases to replace, or add and reorder phases directly. Each distance phase uses either entered groundspeed or its own wind triangle from true airspeed, true track and true wind-from direction. Groundspeed is the forward airspeed after crosswind correction minus headwind; transit time is distance divided by groundspeed. The reserve is applied once to the full mission: a percentage of usable fuel, a fixed quantity or minutes at an entered flow. Automatic updates can be enabled while editing and are enabled when a full route is applied. Checkpoints compare recorded fuel with planned consumption and project completion using the remaining planned phases.
Limitations and verification
- Fuel density varies with grade, batch and temperature; preset values are planning defaults rather than release data.
- Use measured rates for the released aircraft configuration and relevant conditions. Wind changes transit time at the entered fuel flow; it does not infer engine performance, climb, temperature or altitude effects.
- Use true airspeed, not indicated airspeed or groundspeed, for wind-adjusted phases. Track and wind-from direction must both be true. Entered groundspeed mode is not corrected for wind again.
- Wind-adjusted phases assume constant track, airspeed and wind. Split long routes and changing courses or winds into representative phases; infeasible wind triangles cannot produce a valid transit time.
- Checkpoint times start at the beginning of the plan, including ground phases. Fuel readings must use one consistent quantity basis. Refuelling and sensor calibration are not modelled.
- Reserve and return thresholds are planning allowances, not an approved minimum, live return-to-base instruction or regulatory compliance assessment.
- This tool does not assess fuel compatibility, approved grades, tank geometry, feed reliability, thermal management or regulatory reserve requirements.
Version and review status
Formula set: v1.7
Staging review date: 17 August 2026
Status: Staging beta pending user acceptance and cross-browser checks.
Software update: 21 October 2026. Multi-waypoint routes and automatic mission fuel calculations v1.7 use reference and synthetic software checks; aircraft performance and operational limits have not been measured or approved by these checks.