how can i calculate US index ??

are there any new formular ???

because i found some old formular , but it does not give same result with current usd index number in reuters .

An easier way would be to just find the symbol for your charts and graph it.

Another option:

http://tick.ino.com/chart/

thanks for all answers ! but the current method to calculate US Index does not give the same result with US Index in the Reuters .

I dont understand why ! maybe there is another different formular ???

are there AUD/USD in this formular ??? some one said that it contend upto 7 pairs in this formular !