Help in Cumulative Sum

Dear all,

I have a big set of numbers that goes from H5 to H29804.

I want a code that can do a cumulative sum of 11 cells each time. That would be:

 =Sum(H5:H16)
=Sum(H17:H28)
=Sum(H29:H40)
=Sum(H41:H52)
and so on...

Can anyone help me out here?

Thank you

Try this ...

=SUM(OFFSET($H$5,(ROWS($H$5:H5)-1)*12,,12,1))

Dear Phuocam, are you sure that is like you said?

I get one Excel error on the formula...

Thank you!

Please see attachment ...

Dear Phuocam,

Thank you so much!!!! It works like a charm!!

Thank you!!!

You're welcome!