Determining the value of SEO can be quite complex and must be looked at from multiple angles It s not just a matter of calculating organic leads sales and revenue growth but instead it should be assessed by first establishing the current baseline value of the SEO traffic Then the value should be based on the incremental leads sales and revenue generated by SEO from non branded traffic For example let s say that today your SEO traffic drives 100 sales per month worth 100 000 that should be your baseline so the expectation should be that the SEO value is incremental to that amount Therefore if in 6 months time the traffic from SEO is generating 150 sales and 150 000 revenue of which 40 of the additional sales and 40 000 revenue are from non brand that is what the SEO work s true value should be As mentioned at the beginning it s a little bit more complex than this as some of the SEO work is also aimed at retaining the current status and rankings Whilst this is just a very simple way to calculate how much SEO is worth the reality is that the real value can be much higher