Leg Fuel Burn
Calculator
Results
- Fuel required
- 19.318181
- Flight time (hours)
- 2.272727
- Flight time (minutes)
- 136.363636
Aviation and marine results
| Fuel required | 19.318181 |
| Flight time (hours) | 2.272727 |
| Flight time (minutes) | 136.363636 |
formula-map diagram
- Fuel required
- 19.318181
- Flight time (hours)
- 2.272727
- Flight time (minutes)
- 136.363636
Aviation and marine relationship
Formula
Fuel = (distance ÷ GS) × fuel flow= 19.318181818182
Note
This is a simplified model: it applies a standard navigation, performance or seamanship formula to the numbers you entered. True airspeed and density altitude use the ISA troposphere model for dry air and ignore humidity, compressibility and instrument or position error, so they are not a substitute for your aircraft's flight manual or an air data computer. Wind, climb, descent and fuel figures assume a steady wind and a constant speed and fuel flow for the whole leg; they ignore manoeuvring, holding, taxi and start-up fuel, terrain, turbulence and air traffic control routing. Takeoff distance scales an entered sea level figure by a rule-of-thumb percentage per 1000 ft of density altitude and is not a certified performance chart. Weight and balance results depend entirely on the arms and weights you enter and must be checked against the approved loading envelope. Hull speed is the classic 1.34 × √LWL displacement estimate, boat fuel burn is a horsepower-based approximation, anchor scope is a rule of thumb, and the rule of twelfths is a linear approximation of a sinusoidal tide that does not hold in all locations. Always use official charts, tide tables, the aircraft or vessel manuals and current weather, and treat these numbers as planning estimates only.
More in Aviation and marine
See all →Frequently asked questions
What does this calculator estimate and what inputs does it need?+
It estimates the total fuel consumed on one leg of a flight, based on your aircraft's fuel burn rate (per hour), the leg's estimated time enroute, and sometimes separate rates for climb, cruise, and descent phases. The core calculation is simply fuel burn rate multiplied by flight time.
Why is fuel burn rate usually different during climb versus cruise?+
Engines run at higher power settings during climb to gain altitude quickly, which burns fuel at a higher rate than the more efficient power setting used at cruise. Ignoring this and using only a cruise fuel-burn figure for the whole flight can underestimate total consumption, especially on shorter legs.
How does groundspeed versus airspeed affect the time used in this calculation?+
Fuel burn depends on time in the air, and time enroute depends on groundspeed, not airspeed, since groundspeed determines how long it actually takes to cover the distance between two points. A headwind lengthens the time enroute and therefore increases total fuel burned for the leg.
What's a common misconception about fuel burn calculations?+
Assuming fuel burn scales linearly with distance regardless of conditions. In reality, wind, altitude, weight, and power setting all change the effective burn rate, so the same route distance can require noticeably different fuel loads on different days.
Should this leg fuel burn figure be used as the total fuel to load?+
No — it should be treated as trip fuel only. Regulations and good practice require adding reserve fuel, alternate fuel if needed, and taxi/start-up fuel on top of the leg burn estimate to arrive at the total fuel required for the flight.