Formulae’s

Imperial Gallons × Specific Gravity × 10 = Lbs
Imperial Gallons × 1.2 = U.S. Gallons
Lbs × 0.454= Kg
Liters × Specific Gravity = Kg
Celsius = 5÷9× (Fahrenheit – 32)
Where – 40° Celsius = – 40° Fahrenheit
Distance = TAS × Minute ÷ 60
QNH = QFE + Elevation ÷ 30
QFE = QNH – Elevation ÷30
Loop Scale Reading + Quadrant Error Correction = Relative Bearing
Relative Bearing + Course (Magnetic) = QDM
QDM ± 180° = QDR
QUJ ± 180° = QTE