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Mass Of Fuel  
User currently offlineAero42 From United States of America, joined Oct 2000, 18 posts, RR: 0
Posted (15 years 7 months 1 day ago) and read 2144 times:

Does anyone know the mass in pounds of a gallon of jet fuel? Thanks.

8 replies: All unread, jump to last
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 1, posted (15 years 7 months 1 day ago) and read 2090 times:

6.7 lb/gallon. 150 gallons per 1000 lbs.

User currently offlineA320FO From Austria, joined Oct 2000, 211 posts, RR: 1
Reply 2, posted (15 years 7 months 1 day ago) and read 2086 times:

It depends on the density of fuel which can vary.
Average fuel is about 0.8 kg per liter which comes to approx. 6.55 lbs per gallon

User currently offlineL-188 From United States of America, joined Jul 1999, 30410 posts, RR: 57
Reply 3, posted (15 years 7 months 21 hours ago) and read 2069 times:

There is some variation based on manufacture, type and the temperture of the fuel. A pound of fuel for example will take up less space on a -10 day then on a 70 degree day.

Most of the books I see plan on 6.8 lbs be gallon of Jet A.

User currently offlineDufo From Slovenia, joined May 1999, 846 posts, RR: 4
Reply 4, posted (15 years 7 months 20 hours ago) and read 2062 times:

Actually it's 0.72kg/l for 100LL fuel. (that's 6lbs/gallon).


I seriously think I just creamed my pants without any influence from any outside variables.
User currently offlineRunway From United States of America, joined Jun 2005, 0 posts, RR: 0
Reply 5, posted (15 years 7 months 15 hours ago) and read 2050 times:

The weight for a given volume of Jet A changes with temperature. At 15.6C Jet A-1 is 1.78lbs/l, however if the temperature were to rise above this the fuel would expand. In this case 1/l of fuel is going to weigh less than 1.78lbs/l.

This is called the specific gravity of the fuel. It is a measurement taken whenever needed to let the flight crew know how much their fuel weighs. If for example an aircraft took on 40,000L of fuel at 1.6390lbs/l the total weight of fuel is 65,560lbs. If the SG for the fuel was 1.8040lbs/l the total fuel weight would be 72,160lbs. That's a difference of 6600lbs.

This is important for crews when calculating balance fields, or V speeds etc. Hope this answers your question.


User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 30
Reply 6, posted (15 years 7 months 15 hours ago) and read 2049 times:

Just as NKP S2 wrote. The nominal weight of Jet A is 6.7 lbs per gallon. This is the average weight when calculating gallons pumped versus pounds indicated or performing a known quantity on a fuel tank with an inop fuel quantity system. Normally at the beginning of the work shift we'll call the fuel tank farm to get the most accurate specific gravity. It varies usually 6.7 - 6.8 lbs per gallon. But as previously said, 6.7 is nominal.

You're only as good as your last departure.
User currently offlineEvilboy From , joined Dec 1969, posts, RR:
Reply 7, posted (15 years 6 months 4 weeks 1 day 3 hours ago) and read 2021 times:

I fuel 737, md 90's 757. and we use 6.7

User currently offlineBuff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 8, posted (15 years 6 months 4 weeks 19 hours ago) and read 2012 times:

When discussing "gallons", it is important to discriminate between US Gallons and Imperial. In Europe and of course the UK, a gallon is 160 ounces and known as an Imperial Gallon. Because of this potential for confusion, the whole world delivers fuel in Litres, unless of course it is the USA or a protectorate!! Roughly, there are 3.785 litres in a US Gallon at standard temperatures (15 C/59F).

Our company uses metric measure for fuel calculations. It is so much easier!

Best Regards,


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