US Defense officials recently admitted JSF faced a "critical breach" of the Nunn-McCurdy law - an increase in the average procurement unit cost of 50 per cent or more.
The report says the unit cost soared by 57 to 89 per cent since the program baseline was created in October 2001.
The critical breach requires the Pentagon to either kill or recertify the program.
DoD is in the process of updating its JSF cost estimates as part of the recertification process, which is due to conclude in June.
The new report is a snapshot of where costs stand today, but the estimates are subject to change.
The report comes on the heels of congressional testimony by senior Pentagon officials about the JSF program's serious problems and DoD's efforts to restructure its largest procurement endeavour.
Lawmakers and reporters have pressed the department for more information about the cost of the troubled program.
The US Defense Department plans to buy 2,443 of the Lockheed Martin-built fighters.
In "then-year dollars" - which include inflation - the total procurement cost of the program is between $US278 billion and $US329 billion and the average procurement unit cost is between $US114 million and $US135 million, the report states.
The report also looks at the same costs in base year 2002 dollars and in base year 2010 dollars, which do not include inflation. In base year 2002 dollars, the program cost is $US193 billion to $US232 billion and the unit cost is $US79 million to $US95 million.
In base year 2010 dollars, the program cost is $US227 billion to $US273 billion and the unit cost is $US93 million to $US112 million.
But Australian officials are still happy with the program prices as they stand.
"I will just make sure we get the reference right," Air Vice Marshal John Harvey told the Defence Subcommittee last week when asked about the costs of the JSF for Australia.
"The expected price to pay for the average of our 100 aircraft fleet was A$75 million in 2008 dollars at a 0.92 exchange rate.
"That was an expected price, and we carry contingency above that as the aircraft only component of that.
"Those numbers still hold good.
"We have done our projections out to the future, and the recent assessments do not change our assessments of what we will pay for our aircraft."
Some key words to note: average, 2008 dollars and .92 exchange rate as two of those three terms are not fixed.