This is a simple aircraft fuel calculator that simply converts: Fuel Density (KG/L or KG/US GAL), Truck Meter (L), Tank Before (KG), and Tank After (KG). To: Fuel Density (KG/US GAL or KG/L), Calculated Added Fuel (KG), Calculated Added Fuel (US GAL), Tolerance (US GAL), Truck Meter (US GAL), and Difference (US GAL). Feel free to add any comments or suggestions!