I don't have the actual calculation available but I will look into it.I have seen it many times on sites like the IAAF.org or Track&fieldnews.com on the message boards.
In general,you could equate a 6.50 in the 60 meters to approximatley at 10.00 in the 100 meters.That is why Andrey Yepishin running a 6.52 in the 60 last weekend was such a big deal.When any sprinter can get into that range,you are truely,world class!I hope this helps.