Following scenario
$1,000 invested
6% rate annually
$100 per month [$1,200 for a year]
Total Time invested = 1 Year [12 months]
The Results vary, a lot.

FV in Excel Says $2,301.40
http://www.planningtips.com/cgi-bin/savings.pl
Said = $2,295.23
http://www.abgnational.com/calculato...ndSavings.html
Said = $2,299
http://personal.fidelity.com/toolbox...h/growth.shtml
Said = $2,332
http://www.csgnetwork.com/compoundint2calc.html
Said = $2,332
http://www.finance.cch.com/sohoApple...mentReturn.asp
Said = $2,312
http://www.americancentury.com/works...value_calc.jsp
Said = $2,301


http://www.moneychimp.com/calculator...calculator.htm
LOOK = 2,301.40 <--Same as FV


I think this is because of the compounding issue. Some of these
calculators compounded annually by default, some did it by default and
didn't allow you to change it.

It's the compounding stupid!

Mind you, these are a snapshot of the online calc websites. I'm sure a
few thousand more exists.

I'm in hopes I figured this out finally?