Aviation & Aeronautics
Basic

Fuel Uplift

Fuel to be loaded: the required ramp/block fuel minus fuel already on board, converted from mass to volume using fuel density.

Formula

Vup=Freq−FOBρV_{up} = \dfrac{F_{req} - F_{OB}}{\rho}

Variables

V_{up}Uplift volume (L)
F_{req}Required ramp fuel (kg)
F_{OB}Fuel on board (kg)
\rhoFuel density (kg/L, ≈0.8)

Example

Need 4000 kg, 1500 kg on board, SG 0.8: uplift = 2500 kg ÷ 0.8 = 3125 L

Did You Know?

Jet A-1 density varies with temperature (~0.775–0.840 kg/L), so bowsers meter volume in litres while flight plans work in mass — the density figure ties the two together.

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