why do you need to divide by 12? will that past performance gonna repeats the next months?

just a note.....if that fund has dividend distribution policy...that fund's NAV performance is not a good indicator of that fund's returns.

just a note also....
"When judging the overall performance of a mutual fund, always look at the fund’s total return instead of just the changes in its NAV.
Distributions made by the fund may reduce the fund’s NAV but they still belong as part of the shareholder’s overall return.
Viewing returns in this manner gives a more accurate depiction of a fund’s success"
http://mutualfunds.com/education/different...d-total-return/

Use the excel templates in page 1. Either mine or pink spider ones will do.