# 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

When did Power Query debut in Excel?
Although it was an add-in in Excel 2010 & Excel 2013, Power Query became a part of Excel in 2016, in Data, Get & Transform Data.

#### BiocideJ

##### Well-known Member
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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