Free tool / SEO ROI Calculator
Estimate the return on SEO from your own numbers: the monthly cost, the extra visitors you expect, how many become leads and customers, and what a customer is worth. It allows for the months before results start, and shows your payback month and the traffic you need to break even.
Free, with no sign-up and no email.
Reviewed by M. NoumanCo-founder, RankNexus · Updated 19 October 2026
At these numbers, SEO returns $6,000 more than it costs over 12 months, and pays back in month 8.
Estimates from the numbers you enter, not a forecast. Nothing you type is sent to us.
The guide
SEO ROI (%) = (gross profit from SEO − cost of SEO) ÷ cost of SEO × 100
Gross profit from SEO = new customers from SEO × value of a customer × gross marginUse profit, not revenue. A $10,000 sale that costs $7,000 to deliver is worth $3,000 to the business, and that is what SEO has to beat.
These are the calculator's example numbers, for an invented business, so you can follow the sums:
| Step | Sum | Result |
|---|---|---|
| Extra leads a month | 500 visitors × 3% | 15 |
| Extra customers a month | 15 leads × 20% | 3 |
| Gross profit a month | 3 × $2,500 × 40% | $3,000 |
| Months with results | 12 months − 4 months to start | 8 |
| Gross profit over the year | 8 × $3,000 | $24,000 |
| SEO cost over the year | 12 × $1,500 | $18,000 |
| Net return and ROI | $24,000 − $18,000 | $6,000, or 33% |
Notice the four months before results start. They are why SEO looks expensive early on and why it should be judged over a year or more.
Most businesses don't need a separate budget. AI answers draw on the same foundations as search: pages crawlers can reach, clear facts and proof. Set aside part of the budget for three additions: checking a fixed set of buyer questions in AI assistants each month, keeping your facts consistent on the sites AI answers cite, and earning mentions on them.
Measure the results separately: ChatGPT visits arrive tagged utm_source=chatgpt.com, and Search Console's generative AI report shows impressions in AI Overviews and AI Mode. Our pricing shows how that work fits into a monthly plan, and how much SEO costs compares market prices.
A large site uses the same formula, but each input needs more care:
| Step | Sum | Result |
|---|---|---|
| Extra demo requests a month | 5,000 non-brand visitors × 1% | 50 |
| Extra customers a month | 50 × 10% | 5 |
| Gross profit a month | 5 × $12,000 first-year value × 80% | $48,000 |
| Months with results | 24 months − 6 months to start | 18 |
| Gross profit over two years | 18 × $48,000 | $864,000 |
| SEO cost over two years | 24 × $25,000 (team, developers, tools, agency) | $600,000 |
| Net return and ROI | $864,000 − $600,000 | $264,000, or 44% |
In this example the investment pays back only in month 13, so judged after one year it would look like a loss. That is why enterprise SEO is usually judged over two years or more.
Paid search works differently: there is no ramp, but the spend never stops. Compare the two with the ROAS Calculator, or read SEO or Google Ads: where should you start?.
The short answers
SEO ROI is the profit SEO brings in, minus what it costs, divided by what it costs. Profit means extra customers × the value of a customer × your gross margin. Over a year: (gross profit from SEO − SEO cost) ÷ SEO cost × 100.
It depends on your market, your site and where you start, which is why the calculator lets you set the months before results arrive. SEO usually costs money for some months before it returns any, so judge it over a year or more, not month by month.
Your own wherever you can: visitors from Search Console or analytics, the share of visitors who become leads from your forms or call tracking, your close rate from sales records, and the average value of a customer from your accounts. If you don't know one, run a cautious and an optimistic version to see the range.
Questions
Any return above the cost, over a period you can afford to wait. A business with valuable customers can break even on a handful of extra sales a year, while a low-margin business needs much more traffic. The break-even line shows your number.
Profit. Revenue makes every channel look better than it is. Enter your gross margin so the result shows what you actually keep.
Often for a while, because pages that rank keep bringing visits, but rankings can slip as competitors improve. The calculator ignores that tail, so its estimate leans cautious.
Count the leads and sales that come from organic search in your analytics and sales records, value them at your gross margin, and compare that with everything SEO cost over the same period, ideally a year.
No. It shows what a traffic increase would be worth. Use Search Console data and keyword research to judge what increase is realistic for your site.
Yes. The sums are the same at any size; the inputs change. Count the whole cost, including your in-house team and developer time, use non-brand traffic only, and run each product line or country separately. The guide below has a worked enterprise example.
Take the gross profit a campaign brought in, subtract what the campaign cost, and divide by that cost. $10,000 of gross profit from $4,000 of marketing is an ROI of 150%. Use profit rather than revenue, or every campaign looks better than it is.
Track form sends, calls and sales as conversions in your analytics, see which came from organic search and which pages they started on, and match them with your sales records. Then value them at your gross margin and compare that with what SEO cost over the same period.
No. The calculator runs in your browser, and nothing you type is sent to us.
A useful next conversation
The tools show what is on your site. Our free audit looks at how ChatGPT, Google and Perplexity describe you, and what we would fix first. A specialist sends a recorded walkthrough within 2 business days.