Small business SEO ROI calculation

For the purposes of the ROI (Return on Investment) calculation for small business SEO, we'll make
a few assumptions about the amount of traffic clicking through from Google (feel free to modify
these if you think they are different).

In both cases, we're looking at the traffic generated by results appearing on the first page of Google
that's the whole point of proper SEO after all.
To make the maths easy, let's assume that Google generates 100 000 impressions for your keywords
each month.

We'll also say that the ADV is $5 and that the conversion rate is 2%.
Top of 1st page results:
Monthly value of SEO = 100 000 x (20% click through) x $5 x 0.02 = $2000
Bottom of 1st page results:
Monthly value of SEO = 100 000 x (3% click through) x $5 x 0.02 = $300
The difference between ranking right at the top of the first page in organic search results, and at the
bottom of the first page is considerable. So the margins for error in SEO are very thin - second page
results may generate no traffic at all (depending on the popularity of the keywords).