The Exodus- how many actually came out?

I was off the parsha in my daily reading and reading Numbers 1 and 2 and got to thinking if it could be calculated between when they left and a year and a month later when HaShem asked that a census be taken. I got looking around to get some figures and came across this. It makes sense in a way and I still haven't done the math. If any one wants to help out it would be appreciated.

check out this site on if the numbers given in the :Torah are correct or not?

Link here ----------->How many came out of the Exodus?