Cost
How much does conversion rate optimization cost?
What the market charges, and the question that decides whether you should spend it at all.
Published CRO retainers run from around $2,500 a month at mid-market agencies to $30,000 or more at enterprise level, with audits from $5,000. Before any of that matters, one question decides everything: whether your site has enough conversions for testing to produce a readable answer. Below that threshold, most CRO spend buys opinions rather than evidence.
The market
What do CRO agencies charge?
Published figures put mid-market retainers at $2,500 to $10,000 monthly and enterprise engagements from $15,000, with audits starting around $5,000.
| Source | What they publish | What it does not tell you |
|---|---|---|
| Clicks Geekpublished 22 April 2026, last modified 10 June 2026 | Mid-market CRO retainers of $2,500 to $10,000 per month, enterprise engagements from $15,000 to $30,000 or more, basic audits from $5,000, and hourly consulting from $150 to $400.Covers: Retainer and project bands by agency size. | Independent research, and it is the same publisher we cite for PPC fee structures, so it is one house's view rather than two. |
Clicks Geek publishes mid-market CRO retainers at $2,500 to $10,000 a month, enterprise engagements at $15,000 to $30,000 or more, basic audits from $5,000, and hourly consulting from $150 to $400. Their figures are linked above. Worth noting that we cite the same publisher for PPC fee structures elsewhere on this site, so this is one house's view of two markets rather than two independent sources.
Those bands are believable and they are also beside the point for most sites, because CRO has a prerequisite that pricing pages rarely mention. A test needs enough conversions to distinguish a real improvement from noise. If your site produces a few hundred conversions a month, a test detecting a realistic improvement will run for months, and a programme of tests will take years.
That is not a reason to skip CRO. It is a reason to stop calling it testing. Below testable volume the honest method is research-led redesign: find the friction, fix it, measure before and after, and state plainly that seasonality and traffic mix could explain the difference. That is a weaker claim than a controlled test and it is the true one.
Anyone quoting you a monthly testing retainer without first asking your conversion volume is selling a process that your site cannot run.
Cost drivers
What decides whether CRO is worth paying for?
Conversion volume, above all. Testing needs enough conversions to reach significance, and below that threshold the method has to change entirely.
Conversion volume, which decides the method
This is the first question and it changes everything downstream. Enough volume means controlled tests and statistical claims. Not enough means research, sequential change, and honest before-and-after measurement. The two are different engagements at different prices.
How many conversion paths exist
One form on one landing page is a small surface. A multi-step checkout, a quote builder, and three lead forms across six templates is a large one, and each path needs its own funnel analysis.
Who implements the changes
Front-end changes and landing pages we can build. Changes inside your application or checkout need your developers, and the engagement then moves at their pace, which changes both the timeline and the price.
Whether landing pages are being built or only tested
Testing an existing page is analysis. Building purpose-built pages for paid traffic is production work. Sending paid clicks to a generic homepage is the most common and most expensive CRO mistake, and fixing it is usually a build rather than a test.
Tooling already in place
If analytics, session recording and a testing tool are installed and trustworthy, work starts immediately. If they are absent or unreliable, the first phase is measurement, which overlaps with analytics work rather than CRO.
Our model
What do we do when a site cannot support testing?
Research-led sequential redesign, measured before and after, and we say plainly that it is not a controlled result rather than implying it is.
We start by quantifying the largest recoverable loss, then explaining it with research, before proposing anything. That first pass is fixed scope and priced up front, and it frequently concludes that the biggest opportunity is not a test at all.
Where volume supports testing, tests run with a sample size and a stopping rule agreed before launch, and every result is recorded including the losses and the inconclusive ones. The archive of what did not work is the part that stops the same idea being retried every year.
Where volume does not support testing, we say so, and we do not bill for a testing programme that would take three years to produce a verdict.
What the work itself covers is on the conversion rate optimization services page.
Comparing quotes
What should you ask a CRO agency before committing?
Ask how many tests will actually reach significance at your volume, what happens to inconclusive tests, and who implements the winners.
Ask every agency these, including us. Quotes diverge on what is excluded far more than on the headline rate, and the exclusions are rarely volunteered.
At our conversion volume, how many of your proposed tests would actually reach significance, and how long would each take?
What happens when a test is inconclusive? Ask specifically, because most tests are.
Who implements winning variants, and does that cost extra?
Are testing tool licences inside the fee or billed separately?
What is the first thing you would look at, and why that rather than something else?
Questions
What else do buyers ask about CRO cost?
Whether CRO pays for itself, how many tests to expect, whether tools are extra, and what happens when tests keep losing.
Does CRO pay for itself?
When it works it improves every acquisition channel at once, which is why it is often the cheapest performance lever available: a higher conversion rate lowers cost per acquisition across paid search and paid social without touching a bid. Whether it pays back for you depends almost entirely on whether you have the volume to find real wins rather than noise.
How many tests should we expect per month?
Fewer than most proposals imply. A test needs to run for whole weeks and reach a pre-agreed sample size, so a site with moderate volume supports a small number of well-powered tests rather than a stream of small ones. A proposal promising many tests per month on modest traffic is promising unreadable results.
Is this just changing button colours?
No, and tests like that are why some teams concluded CRO does not work. The changes that move numbers are about clarity, cost transparency, reducing required effort, and matching the page to the promise that brought someone there.
What if the tests keep losing?
Then the hypotheses are not coming from evidence, and the fix is upstream in the research rather than in more testing. A run of losses is information. A run of losses that nobody records is a programme that will repeat itself.
Do we need a testing tool licence?
Only if you are actually testing. Below testable volume a licence is a recurring cost against a method you cannot use, and we will tell you that rather than adding it to the stack.
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Get a number that fits your account
Tell us what you are running and we will scope it, then quote against that scope in writing. No package, no anchor, and no figure invented before we have read anything.