# Sum of average growth

##### New Member
Hi, I'm new to the forums and was wondering if someone could help me.

I need to find the average growth rate and can't seem to figure out a simple formula for it. For example:

B1 = 3
B2 = 6
B3 = 9

=Sum((B3/B2)+(B2/B1))

Is there a simpler formula for this? I have a rather large pool of data.

### Excel Facts

Customize Quick Access Toolbar. From All Commands, add Speak Cells or Speak Cells on Enter to QAT. Select cells. Press Speak Cells.
First off, welcome to the forum!

the equivalent to your formula would be
=SUMPRODUCT(B2:B3/B1:B2)

If you have a range of values from B1:B100 your formula would be
=SUMPRODUCT(B2:B100/B1:B99)

Note that the two ranges are the same size, but just offset by one row.

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