PPRuNe Forums > Flight Deck Forums > Tech Log > JetA1 Weight conversions Question PDA View Full Version : JetA1 Weight conversions Question Ejector29th Oct 2006, 22:53To change 1800lbs of Jet A1 to kg you divide by 2.2 To change to L what do you divide by? GusHoneybun29th Oct 2006, 23:09To convert pounds to litres, multiply by 0.57 To convert kilos to litres, multiply by 1.25. Seems to work OK. Spanner Turner30th Oct 2006, 00:10To change 1800lbs of Jet A1 to kg you divide by 2.2 To change to L what do you divide by? Well, to be able to convert a weight into a volume, you'll be requiring the Specific Gravity of the fuel. Weight / SG = Volume. E.g. 1000kgs / 0.795sg = 1257 litres. E.g. 1000kgs / 0.785sg = 1273 litres. Same weight but different volume!! SMOC30th Oct 2006, 00:13Usg X 3.785 X Sg = Kg Img X 4.546 X Sg =kg Ltr X Sg = Kg Kg / 3.785 / Sg = Usg Kg / 4.546 / Sg = Img Kg / Sg = Ltr JackOffallTrades30th Oct 2006, 00:56Errrrr........ You don't fly for a Canadian airline do you?? :O JetMech5th Nov 2006, 04:05To change 1800lbs of Jet A1 to kg you divide by 2.2 To change to L what do you divide by? G'day Ejector :) , There is NO standard conversion factor between Litres and Kilograms for Jet A1. It all depends on the specific gravity (SG) for the day. With my first employer, we had fuelling charts written in steps of 0.005Kg/L for S.G's from 0.760 - 0.840 Kg/L. In reality, the range is usually between 0.780 - 0.810 Kg/L, and we are supplied with (on a daily basis) and expected to use an S.G. that is accurate to 0.001 Kg/L. A ROUGH rule of thumb to see if you are in the ballpark is to use an S.G of 0.800 Kg/L, but this may carry an error of up to 5% in cases where the actual S.G. is nearer the extremes of 0.760 or 0.840 Kg/L. Regards, JetMech BizJetJock6th Nov 2006, 09:13Whilst all the above comments are good for super accurate conversions, if you want a ball park figure to check that the tanker driver hasn't fiddled the figures to charge for more than he's put in, then 1800lbs = 1000ltrs. Also 1000lbs = 150USG. Easy eh?:)