RANGE
Flight Range Calculator
Still air range · Endurance · Fuel consumption · Payload-range & reserve fuel
Breguet equation
payload-range
Aircraft & flight parameters
kg
kg
Operating empty weight + reserves
kt
kg/(kN·h)
Typical: 0.5-0.7 for turbofan
ratio
Typical: 15-20 for transport aircraft
min
FAR 121 reserve requirement
Range formulas
- R = V / (SFC) × L/D × ln(W₁/W₂) Breguet range eq.
- E = 1/(SFC) × L/D × ln(W₁/W₂) endurance
- Fuel = W₁ − W₂ total fuel burn
Still air range
3,850
NM
Endurance
8.6
hr
Fuel burn
12,000
kg
Range profile
Range
Reserve
Fuel fraction: 0.85
L/D: 18
Efficiency factors
Specific range
0.32
NM/kg
Fuel per NM
3.12
kg/NM
Reserve fuel
1,620
kg
Range with reserves
3,330
NM
Fuel & range distribution
Breguet
Trip fuel
12,000 kg
Reserve fuel
1,620 kg
Range usage
3,850 NM