What is conversion rate optimisation?
Conversion rate optimisation, or CRO, means improving your website so a bigger share of visitors do what you want. That might be a call, a booking, a quote request or a sale. It is not about getting more traffic. It is about getting more from the visitors you already have.
A conversion is any action that matters to your business. The conversion rate is the share of visitors who take it. Optimisation is the careful, repeated work of raising that share.
For a small business this is often the cheapest growth there is. You already paid for those visits through your time, your listings or your adverts. If more of them turn into enquiries, every other bit of marketing works harder too.
How do you calculate a conversion rate?
Divide the number of people who completed the action by the number who started it, then multiply by 100. The answer is the share of visitors who converted, shown as a percentage. Pick one action, one page and one period, such as a calendar month, and count only real people.
The government's own service manual (GOV.UK) uses the same sum in its guide to measuring completion rate. Count the completed actions, divide by every attempt, including the ones left half done or failed, and show the result as a percentage. So if 1,200 people visit your quote page in a month and 18 send the form, your rate is 18 divided by 1,200, which is 1.5%.
It also warns you to count only genuine users. Leave out your own visits, test visits and web robots, or the rate will look worse or better than it really is.
A worked example
Here is an illustrative case, not a real firm. Priya runs a garden design business in Leeds. Her quote page gets 1,200 visits a month and 18 quote requests. Using the sum above, that is a rate of 1.5%.
She shortens the form, adds photos of finished gardens and puts her phone number at the top. Over the next few months the same 1,200 visits bring 30 requests. By the same sum, that is a rate of 2.5%, and 12 more chances to win work each month without one extra visitor.
What counts as a conversion for a small business?
A conversion is the action that moves someone closer to paying you. For most local firms that is a phone call, a quote form, a booking or an order. Pick one main action per page, then track a few smaller steps that lead to it, so you can see where people stop.
- Main actions: a sent enquiry form, a booking, a paid order or a tap on your phone number.
- Smaller steps: opening the contact page, starting the form or viewing your prices.
- Not conversions: page views, time on site or followers. They can help explain a result, but they do not pay the bills.
Write down what each conversion is before you change anything. If the target moves halfway through, you cannot tell whether a change helped.
How does conversion rate optimisation work?
CRO works as a loop. You measure where visitors drop out, work out why, change one thing that should help, then test whether it did. You keep what works, undo what does not, and start again on the next weak spot. Each round is small, but the gains add up.
- Measure: record visits and conversions for each key page, and give each step of a form or checkout its own address so you can see where people leave.
- Find the leak: look for the page or step with the biggest drop, and watch how real people use it on a phone.
- Form a hypothesis: write one sentence, such as "a shorter form will bring more quote requests".
- Change one thing: if you change five things at once, you will not know which one worked.
- Test and decide: compare the results over enough time and traffic, then keep the change or roll it back.
Good CRO is mostly patience and care. A quick redesign can raise a rate, but it can also break the very thing that was working.
Most of the gains come from the site itself: a clear offer, a fast page and a form that is easy to finish on a phone. Our web design service builds conversion first websites, and we build yours before you pay anything, so you can judge it against your current site.
Rather have it done for you? We build your website free, it goes live in days, and you pay nothing for the first 14 days. No card needed. See how the free 14-day trial works.
How do you test website changes without hurting your search ranking?
Test in a way search engines accept. Show search engines the same pages people see, point any test version back to the original page, use temporary redirects rather than permanent ones, and end each test as soon as you have an answer. Done this way, a test should not harm your ranking.
Google's guidance on A/B testing best practices for search describes A/B testing as trying two or more versions of a change, such as a different button, to see which works better. Its rules for small businesses come down to four points:
- Do not show search engines one set of pages and people another. That is called cloaking.
- Add a canonical link on each test version that points to the original page.
- If a test sends people to a different address, use a 302 temporary redirect, not a 301 permanent one.
- Remove the test once it is finished, and keep the winning version on the original address.
The same guidance says the time a test needs depends on your conversion rate and how much traffic you get. A page with a few hundred visits a month can take a long time to give a clear answer.
Do you need cookie consent to measure conversions?
Often, yes. In the UK, most cookies that measure visitors are not essential to run your site, so you must explain them and get clear consent first. You cannot set those cookies before a visitor agrees, and that limits what your numbers can show.
The Information Commissioner's Office (ICO) explains this in its guide to cookies and similar technologies. It says you must tell people what your cookies do and why, and that consent must be actively and clearly given. Cookies that are only helpful or convenient, or only essential for your own purposes, still need consent.
In practice, your figures will only cover the visitors who said yes. Read them as trends rather than exact counts, and count the things you can see without tracking, such as enquiry emails, booked jobs and calls answered.
Why does doing CRO well take real skill and time?
Because small sites have small numbers, and small numbers mislead. A change can look like a win for a fortnight and fade by the next month. Doing CRO well means knowing your customers, writing clearly, designing for phones, keeping pages fast and reading results without fooling yourself.
The hard parts are rarely the tools. They are the judgement calls:
- Knowing which page to fix first, so effort goes where the money is.
- Writing an offer and headline that match what your customers search for.
- Designing forms and buttons that work with a thumb on a small screen.
- Keeping the site fast, secure and within the cookie rules while you test.
- Waiting long enough to trust a result, then rolling back cleanly when a change fails.
Each round can take weeks, and most business owners do not have that time spare. If you want a quick start, our guide to getting more leads from your website lists the fixes worth trying first.
Should you do CRO yourself or have Buzzozo do it for you?
Do it yourself if you have the time, steady traffic and the patience to test one change at a time. Have Buzzozo do it if you would rather run your business. We build a site designed to turn visitors into enquiries, then look after it for you every month.
Our sites are built mobile first, with clear offers, fast pages and booking and enquiry forms that go straight to you. Each one comes with an AI assistant that answers your customers' questions, so visitors still get a reply while you are busy on a job. We build yours before you pay anything, so you can see the difference before you decide.
If you would rather not touch the site at all, a managed website, built and looked after for you, keeps it fast, secure and up to date while the improvements carry on.
The Website plan is a premium build from £149 a month for the first 100 businesses, with the hosting, security and looking after included. Compare the plans and prices, or start your free 14-day trial. No card needed.
A good first test is often the call to action on your main pages. To find where visitors drop out before they reach it, use customer journey mapping.
Common questions
What is a good conversion rate for a small business website?
It depends on the action and where visitors come from, so the best benchmark is your own past rate. Measure one main action on one page for a few months, then aim to beat it. Even one more enquiry in every hundred visits can add up to a lot of extra work over a year.
Is conversion rate optimisation the same as search engine optimisation?
No. Search engine optimisation brings more people to your site from search. Conversion rate optimisation helps more of those people take action once they arrive. The two work best together, and you can test changes in a way that does not harm your search ranking.
How long does conversion rate optimisation take?
Each test usually needs several weeks, and longer on a quiet site, because you need enough visits to trust the result. Most gains come from many small rounds over months, not one quick change. That is why many owners have someone else look after it.