By Eric Engle
11 Feb 2019

How to Measure SEO Results and ROI

Content Marketing


Measuring SEO ROI is more difficult than most people understand.

It sounds simple; just tag your pages properly with analytics code, make sure you're tracking conversions and can associate a dollar value with those conversions, and you're done, right? Not so fast! There is much more to the challenge of SEO ROI than that.

To illustrate the point, I'm first going to explain how it works with PPC. Here is a simple breakdown:

Calculating PPC ROI

On any given day, the amount of money I spend in paid search has a one-to-one correspondence to clicks to my website, and some of those clicks result in revenue-generating transactions (or “contact us” requests, or some other desirable action). To a large degree, paid search is a direct response medium.

To be fair, there is definitely the concept of deferred conversions that result from paid search too. Someone clicks on an ad and goes to your site, doesn't convert in that session, but comes back at some later time — perhaps by some other means than clicking on an ad — and converts. In PPC terms, we refer to that as an "assisted conversion."

That said, a large part of the realizable revenue comes from those initial clicks, and the cost of the campaign scales in a linear way in relationship to the clicks received. The key deliverable from your PPC spend is clicks from users.

Now, let's look at SEO. To set the tone, let me share how I often explain what an SEO sales pitch is like: "I don't know what I'm going to do for you yet, I don't know how fast you're going to get results, and I don't know how big those results are going to be. Ten thousand dollars per month, sign here." Of course, I'm joking when I put it that way, but there is a real element of truth to that being what an SEO pitch sounds like.

The reason the typical pitch sounds so obscure is that the key deliverable from SEO campaigns is increases in organic search rankings. These gains in rankings then deliver clicks from users on an ongoing basis, often for an extended period of time.

It's like a gift that keeps on giving — but that's not how most businesses look at ROI from SEO revenue. For example, if I invest one million dollars in SEO this year, and we get four million dollars in SEO-related sales, which reflects a lift from two million dollars the prior year, what do I calculate as the ROI? Here is the way many organizations look at it:

One Model for Calculating SEO ROI

Is it (2M - 1M) / one million dollars = 100%, because that's how much my SEO revenue grew (as opposed to my total SEO revenue) in the same year? I'd argue that this isn’t a good way to look at it at all. Why? Well, one reason is that if I invest nothing in SEO at all, the two million dollars I got in SEO revenue last year will likely be less in this year, yielding a chart more like this for SEO revenue:

SEO Results With No Investment

Continue with no SEO revenue for multiple years, and you'll see that number plummet down to near zero. Why? Because your competition is investing in SEO while you're not. Their SEO gains will become your SEO losses. Part of what you're accomplishing with your SEO investment is defending your current levels of SEO revenue.

But there is also a forward-looking part to this story too! Let's go back to my original scenario, where I invested one million dollars in SEO in the current year and saw SEO revenue go up from two million dollars to four million dollars. Now, let's imagine that I shut off my SEO investment in the next year. What happens in that year?

You guessed it: SEO revenue does not instantly drop back to two million dollars. In fact, over time, the yield on that one million dollars in a SEO investment might look like this:

SEO investments impact revenue

That's one heck of a different picture of SEO ROI, is it not? Oh, and don't forget the fact that in the current year, the one where SEO revenue went from two million dollars to four million dollars, I would have lost 500K dollars of SEO revenue if I hadn't made any investment at all. Now your real SEO ROI looks something like this:

A More Refined Look at SEO ROI

Now that we've established some basic concepts, let's look at a couple of models for SEO campaigns and the ROI you might get.

Model 1: The Self-Defense SEO ROI

Let's say you have that two million dollars per year revenue from SEO run rate coming into a year. You know that you could see large-scale growth if you could invest one million dollars in SEO, but you just can't — the budget you can afford is only 250K dollars. Let's say it turns out that 250K dollars is enough SEO investment that your revenue for the year will turn out to be two million dollars, i.e. no growth.

You did enough to keep from losing ground to your competition. They were doing the best they could to take some of your market share, but failed. Now let's say you would have lost 500K dollars in revenue if you hadn't invested the 250K dollars. Your actual ROI in this scenario would be:

SEO Self Defense ROI

Note that this is the story if you look at this on a one-year basis only. Let's say you invest 250K dollars per year, over two years, and you manage to keep the SEO revenue at two million dollars for both years. Using the numbers I shared above on the “no SEO investment overall multiple years” model, I will have defended 500K dollars of revenue in year one and one million dollars of revenue in year two. The picture of this ROI scenario looks like this:

SEO self defense ROI 2 year view

Now you're getting a reasonable model to estimate the SEO investment results when you invest only enough to preserve your revenue, but show no growth.

Model 2: Growth Mode SEO ROI

Earlier in this article I laid out a model that suggested ROI over a five-year period was 375%. Should I walk into a pitch and tell a client we're going to get 375% ROI? Frankly, that would make for a challenging conversation.

If you're an executive, you likely have little interest in a five-year ROI model; what you're able to achieve in this year is probably most important. You may even have bonus compensation programs based on the ROI you can get with your budget in the current year.

However, I also believe that educating yourself and your team on how it works with SEO is important. If you're interested in the business for the long haul, then how it will perform next year should be of interest to you — and your team too, even if it's a secondary interest. Everyone should want to be part of a growing business, not a shrinking one.

For that reason, I'd show a two-year view similar to this one:

Growth Mode SEO ROI

This at least gives you and your management team a view of the bigger picture of how SEO ROI works.

Approaching the Budget Conversation

If your business is like most businesses, the focus on the current year is natural. In larger companies, the executive staff has current year goals, and compensation is often tied to those goals. But, if the executive staff are forward-looking, the long-term health of the business is arguably of great interest too.

Learn the mindset of who you are going to be presenting the budget to, whether you’re part of the executive team, or just building a plan to present to them. This includes understanding the overall organizational budget and margin goals, and adjusting your budget proposal accordingly. Start the conversation by making sure that your team understands the difference in the deliverables between PPC and SEO. Here is a simple visualization of it:


Once this concept is clear in everyone's mind, the rest of the story becomes quite a bit easier to tell. From here, you can lay out the various ROI models using two, three or even five-year time horizons to show the broader strategic picture, and the one-year ROI to outline the impact on company performance in the current year.


The first step in understanding how to measure ROI is to understand a proper definition for the impact of your investment. As you have seen, this is not easily done in the world of SEO.

In other articles on this blog, you’ll see a lot of invaluable information on how to achieve and measure results. But, along the way, remember the enduring aspects of the benefits of an SEO investment. It’s not contained to a single year in the same simple way as PPC and other types of advertising campaigns.

The more you and your team understand how SEO ROI differs from other mediums, the better, as it will help your organization have the right perspective on the role that SEO investments should play in your overall marketing mix.

Eric Engle

Eric Enge is General Manager of Perficient Digital, a full-service, award-winning digital agency. Previously Eric was the founder and CEO of Stone Temple, also an award-winning digital marketing agency, which was acquired by Perficient in July 2018. He is the lead co-author of The Art of SEO, a 900+ page book that’s known in the industry as “the bible of SEO.” He is a prolific writer, researcher, teacher and a sought-after keynote speaker and panelist at major industry conferences.