Jake,

Assuming the months are dates, use a pivot table and group the dates by
clicking year and quarters. The link below will help you with grouping pivot
tables


http://www.contextures.com/xlPivot07.html

Don


"Jake" wrote in message
...
I have many years of data in simple monthly columns. I would like to
look
at the same data in calendar quaters vs. months. i.e. the sum of Jan to
Mar,
April to Jun, etc. and have it repeat for the entire column. Can I
establish
a fomula that takes the sum of 3 rows of data in the column ( Jan+Feb+Mar)
then adds the next 3 rows( Apl+May+Jun) without including the previous
quarters numbers. Thanks in advance for your help.