Conversion Funnel

What is a conversion funnel?

The conversion funnel (also called a sales funnel or customer journey) models the stages a prospect goes through, from discovering your business to the final conversion (a purchase, a sign-up, a booking). It is called a "funnel" because the number of people shrinks at every stage: many come in at the top, few reach the bottom. The aim is to maximise the percentage of people who move from one stage to the next.

The classic AIDA model (Attention, Interest, Desire, Action) describes the 4 psychological phases of the buying journey. In digital marketing we tend to talk instead about TOFU (Top of Funnel, awareness), MOFU (Middle of Funnel, consideration) and BOFU (Bottom of Funnel, decision).

The stages of a digital conversion funnel

TOFU (Awareness) is the stage where the prospect discovers you exist. They do not know you yet and may not even have put a name to their problem. TOFU channels: SEO blog articles, social media posts, YouTube videos, awareness advertising. TOFU content educates and attracts without selling: "The 10 mistakes to avoid when building your website".

MOFU (Consideration) is the stage where the prospect has identified their need and is comparing solutions. They visit your site, read your case studies, download your guide. MOFU channels: landing pages, newsletters, webinars, client stories, comparison pages. MOFU content establishes your expertise: "How to choose the right web agency in 2026".

BOFU (Decision) is the final stage, where the prospect is ready to buy and is weighing up offers. BOFU channels: pricing pages, demos, free consultations, free trials, detailed testimonials. BOFU content reassures and triggers action: "Get your free quote in 2 minutes".

Optimising each stage of the funnel

At every stage, friction makes visitors drop out. Analysing the funnel is what lets you find those friction points and fix them.

In TOFU, the problem is often too little traffic, or traffic that is not qualified. The fix: invest in SEO on informational keywords, run awareness campaigns on Meta Ads, and create content people share (studies, infographics).

In MOFU, the problem is often a lack of nurturing. The prospect visits your site but never comes back. The fix: offer a lead magnet (ebook, checklist, template) in exchange for an email address, then nurture the prospect with an automated sequence of 5 to 7 emails over 2 to 3 weeks.

In BOFU, the problem is usually a lack of social proof or friction in the process. The fix: show detailed testimonials, offer a guarantee, simplify the form or the checkout, and add genuine urgency.

Measuring funnel performance

Every transition between stages has a conversion rate you can measure. The TOFU to MOFU rate (visitor to lead) sits between 2% and 5% on average. The MOFU to BOFU rate (lead to customer) ranges from 5% to 20% depending on the sector and the length of the sales cycle. Tracking these rates in Google Analytics 4 shows you exactly where prospects drop off.

Cost per stage matters just as much: cost per visitor (CPV), cost per lead (CPL), cost per customer (CAC). If your CPL is 15€ and 10% of leads become customers, your CAC is 150€. If lifetime value (LTV) is 2 000€, your funnel is profitable.

The conversion funnel for a tradesperson or a sole trader

Plenty of small business owners assume the conversion funnel is something only large companies need. It is not. A plumber, a coach or a restaurant owner has a customer journey too, even if it only runs to three stages. Take a heating engineer: a prospect finds the site through a Google search ("boiler repair + town"), reads the service page and the reviews, then fills in the quote request form. Three stages, three chances to lose or win the prospect.

The classic small business mistake is to bet everything on acquisition (paying for ads) and never look at what happens once the visitor arrives. The result: an advertising budget feeding a leaking funnel. Before you increase traffic, plug the leaks. A tappable phone number on mobile, a form with three fields instead of ten, and social proof visible on the first screen can double your contact rate without spending another euro.

Nurturing: warming up lukewarm prospects

The vast majority of visitors are not ready to buy on their first visit. Several industry studies put it at around 96% of visitors who leave a site without converting the first time they land on it. Nurturing means staying in touch with those lukewarm prospects until they are ready.

The simplest and most profitable lever is still email. In exchange for an email address (through a free guide, a checklist or an estimate), you can trigger an automated sequence that delivers something useful, answers objections and puts your offer back in front of them at the right moment. Advertising retargeting completes the setup by showing your brand again to people who have already visited. Together, these two levers recover a meaningful share of the prospects who would otherwise be lost for good.

Automating the funnel

Marketing automation tools (HubSpot, ActiveCampaign, Brevo) let you automate the funnel: welcome email, nurturing sequence, lead scoring, automatic follow-ups, and handover to sales once the lead is "hot". An automated funnel works for you 24 hours a day and improves conversion by 30 to 50% compared with manual follow-up.

Mapping your funnel: the starting point

Before you optimise anything, you need to see your funnel on paper. The exercise is simple: list every stage a typical customer goes through, from the moment they first hear about you to the purchase, then note the estimated pass-through rate between each stage. This mapping almost always throws up a surprise. The stage that loses the most people is rarely the one you had in mind. A restaurant owner might discover that visitors do read the menu but give up at the booking stage, for want of a clear button on mobile.

Once the funnel is mapped, prioritising becomes obvious: put your effort into the stage that loses the most prospects, because that is where the biggest growth sits for the lowest cost.

At ConvertiLab we design complete conversion funnels. From the first click on your ad to the signed contract, every stage is optimised to maximise conversion, including the automated email follow-up that turns lukewarm visitors into customers.