How do you calculate an investment that has monthly contributions of, say
$200, every month with a 16% annual rate of return (i.e. $200 on June 1st,
$200 on July 1st, etc.)? This is so that I can get an idea of what the long
term investment will return. I would ideally like to use something like this
to track my personal savings/investment.

If there is another thread let me know.

Any help would be greatly appreciated.