Organic vs. Paid Search for B2B Leads: What 6 Months of GA4 Data Shows

Sooner or later, every B2B marketing team asks the same question in a planning meeting: where do our leads actually come from? 

And the answer usually shows up as a traffic chart, which is a bit like answering “how’s the restaurant doing?” with the number of people who walked past the window.

I’ll admit I came into this one biased. I’m an SEO, so part of me expected organic to win every comparison. So we went to the data: six months of GA4 (March to August 2026) from the B2B clients we work with at Previsible, looking at sessions, lead sessions and conversion rate for organic search, paid search, direct and AI assistants.

The first cut gave the answer most teams expect: paid search converts better per visit. 

Then we split organic by the type of page people land on, and that’s where it got interesting. 

When organic visitors land on a product page, they convert at about the same rate as paid visitors landing on a product page. Most of the gap comes from where each channel sends people.

We also looked at direct, because part of it is probably search traffic that GA4 couldn’t attribute, and at AI assistants like ChatGPT and Gemini, which are still small but already bring a surprising share of leads.

Key takeaways

• Organic search brought 26.1% of lead sessions at the median site, from 21.4% of sessions. Paid search brought 21.0%, from 4.8% of sessions.
• Across all pages, paid search converted better. Comparing both channels inside each site, organic’s conversion rate was about 40% of paid’s at the median.
• On product pages, organic converted like paid search. Comparing product-page landings inside each site, organic’s rate was 1.04 times paid’s at the median.
• The difference is where people land. About 72% of paid search landings were product pages, compared with 14% for organic. Organic also brings the people reading blog posts and guides, and those pages converted at about 15% of the rate of product pages.
• Organic and direct together brought 52% of lead sessions from 77% of sessions, and organic converted 2.3 times as well as direct.
• AI assistants brought 2.0% of lead sessions from 0.5% of sessions, converting at about 2.9 times organic’s rate.
• Organic’s monthly share of lead sessions stayed between 18.5% and 25.0% from March to August 2026.

How much of B2B lead activity comes from organic vs. paid search?

Let’s start with volume. We counted lead sessions: visits where someone requested a demo, booked a meeting or sent a sales form. 

At the median site, organic search brought 26.1% of them, more than any other channel we compared. Paid search brought 21.0%, direct 19.1% and AI assistants 2.0%.

The chart also shows how each channel’s leads compare with its traffic. Organic brought a slightly bigger share of leads (26.1%) than of sessions (21.4%), so its visits pull their weight. And since organic doesn’t charge you per click, every extra visit that converts comes with no extra media cost.

Paid search is the concentrated one: 4.8% of sessions and 21.0% of lead sessions. Direct goes the other way, with about half of all sessions and less than a fifth of lead sessions. More on that one below.

Does organic or paid search have a higher conversion rate?

Across all landing pages, paid search had the higher conversion rate. At the median site, 0.70% of paid search sessions included a lead, compared with 0.21% for organic. Comparing both channels inside each site, organic’s rate was about 40% of paid’s.

If those percentages look small, it’s because they count every session on the marketing site: people reading the blog, checking pricing, or (my favorite) googling the brand to find the login page.

This is usually where the comparison stops. We wanted to go one step further, because paid and organic send people to very different pages.

Do organic and paid search convert the same on product pages?

Paid search campaigns in B2B usually point to a product page, a pricing page or a demo page. 

Organic brings people to every corner of the site: the homepage, the blog, the glossary, a template someone found at 11 p.m. 

So we classified every landing page as homepage, product page or informational resource, and compared again.

The mix is very different. At the median site, 72% of paid search landings were product pages, compared with 14% for organic. Almost 29% of organic landings were informational pages, while paid search barely sent anyone there (about 1%).

Then we compared conversion rates on the same type of page, inside each site:

On product pages, organic converted at 1.04 times paid’s rate at the median site. Basically a tie. 

On the homepage it was close too, at 0.94. When we kept only the sites with at least 20 lead sessions in both channels, the product-page ratio stayed at about 1.0.

Informational pages convert less, and that makes sense: someone reading a guide is at a different moment than someone looking at pricing. Inside each site, organic informational pages converted at about 15% of the rate of organic product pages. 

Those readers matter later (many come back, sometimes through another channel), they just don’t fill out the demo form on their first visit.

So this is how I read it: when organic and paid search bring the same kind of visitor to the same kind of page, they convert about the same. 

The overall gap mostly reflects the different jobs each channel does. And it points to a nice opportunity, because in our data the product, pricing and comparison pages that bring organic traffic converted like paid landings, without a cost per click.

Why look at direct and organic search together?

Direct is GA4’s label for visits without a known source: people typing your URL, existing customers, bookmarks, links opened from email or chat apps that don’t pass a referrer, and visitors whose source got lost on the way. 

At the median site it was 49.6% of sessions and 19.1% of lead sessions.

A good part of that traffic probably found you through search at some point. Someone reads your guide in March, remembers the name, and types your URL in May to book a demo. 

A last-click report gives that lead to direct. That’s why we like looking at both together:

• Together, organic and direct brought 77% of sessions and 52% of lead sessions at the median site.
• Organic converted 2.3 times as well as direct inside each site, and 2.0 times as well when we compared only product-page landings.

Direct converts lower because it mixes in a lot of people who aren’t shopping for anything, like customers logging in or candidates checking the careers page.

GA4 alone can’t tell you how much of direct started in search, but if your organic numbers look modest, I’d put direct next to them before drawing conclusions.

Do AI assistants like ChatGPT bring B2B leads?

Visits from ChatGPT, Perplexity, Gemini, Claude or Copilot usually end up under Referral (or Direct, when the app doesn’t pass a referrer). So we pulled them into their own group based on the source.

They’re still small: 0.5% of sessions at the median site. But they brought 2.0% of lead sessions, and inside each site they converted at about 2.9 times organic’s rate at the median. 

They converted better than organic in most of the sites we looked at.

It makes sense when you think about how people use these tools. By the time someone clicks a link inside an AI answer, they’ve often asked their questions, compared options and come out with a shortlist. 

AI visitors also landed on product pages more often than organic visitors did (22% vs. 14%).

Two notes before getting too excited. These are small numbers, so a handful of leads can move a site’s rate a lot. And visits from apps that don’t pass a referrer are hiding inside direct, so the real number is probably higher. Even so, the pattern held across most sites, and it’s one I’d start tracking now.

Three B2B sites, three ways organic search brings leads

Medians are useful, but they flatten everything. Here are three anonymized sites from the sample, each with its own story.

Site A: a small organic audience that brings a lot of leads

	Organic Search	Paid Search	Direct
Share of sessions	5.0%	9.2%	28.8%
Share of lead sessions	29.0%	29.0%	17.8%
Conversion rate, product pages	0.94%	0.19%	0.06%
Conversion rate, informational pages	0.07%	0.00%	0.003%

This is still my favorite one. Organic brought 5% of sessions and 29% of lead sessions, the same share of leads as paid search with about half the traffic. 

On product pages, organic converted at about five times paid’s rate.

The next thing I’d check here is which paid queries land on those product pages, because organic is already showing what a high-intent visit looks like on them.

Site B: on product pages, it’s a tie

	Organic Search	Paid Search	Direct
Share of sessions	20.8%	27.3%	15.3%
Share of lead sessions	18.9%	21.0%	13.5%
Conversion rate, product pages	1.39%	1.13%	2.44%
Conversion rate, informational pages	0.12%	n/a	0.02%

This one looks a lot like the medians. On product pages, organic and paid converted at similar rates. 

Direct visitors who landed on product pages converted even better, which fits the idea that many of them are coming back to finish something they started.

Informational pages converted at about a tenth of the product-page rate, doing their job earlier in the journey.

Site C: paid search leads, even on product pages

	Organic Search	Paid Search	Direct
Share of sessions	26.3%	14.5%	38.0%
Share of lead sessions	25.8%	36.0%	19.1%
Conversion rate, product pages	0.40%	1.24%	0.24%
Conversion rate, informational pages	0.12%	0.07%	0.04%

Not every site follows the median, and this one is a good reminder. Here paid search converted at about three times organic’s rate on product pages and brought 36% of lead sessions. 

Organic still brought about a quarter of the leads from a quarter of the traffic. This is one I would like to understand more. What types of pages are paid users landing in? Is there anything organic should be learning from the paid strategy? 

Is organic’s share of leads stable month to month?

Organic brought between 18.5% and 25.0% of lead sessions every month from March to August 2026. 

For this view we kept only the sites whose lead event shows up in all six months, so the group stays the same from month to month.

The share peaked in April and was lowest in May. A share can move because organic brings more or fewer leads, or because other channels do (a paid campaign, an event, a partner that suddenly sends a lot of traffic). 

We didn’t separate the two, so I’d read this chart as the range to expect: in our clients’ data, organic brought roughly a fifth to a quarter of lead sessions, month after month.

How to see conversion rate by channel and landing page in GA4

You can run a version of this on your own site in about 20 minutes (coffee not included). This is the setup we used:

1. Pick one lead event. Choose the one closest to a sales conversation (a demo request or a booked meeting), and make sure it’s marked as a key event in GA4 (Admin > Data display > Events).
2. Add an AI assistants channel. In Admin > Data display > Channel groups, copy the default group and add a channel called AI assistants above Referral, with a rule like Source matches regex chatgpt|openai|perplexity|gemini|claude|copilot. Custom channel groups also apply to past data, so you don’t have to wait months to see it.
3. Open the Traffic acquisition report. Go to Reports > Acquisition > Traffic acquisition and switch the primary dimension to your new channel group.
4. Filter the key event column to your lead event. In the Key events and Session key event rate columns, select only that event. Session key event rate is your conversion rate by channel. Add a hostname filter so app logins and help-center visits don’t dilute the numbers.
5. Add the landing page. In Explore, build a free-form exploration with your channel group and Landing page as rows, and Sessions and Session key event rate as values. Group landing pages by type with a few path rules (/blog/, /resources/, /pricing/, /product/), in GA4 or in a spreadsheet.
6. Compare like with like. Put organic and paid side by side for the same type of page. That comparison inside your own site tells you more than any external benchmark.
7. Check that the source survives. If almost every lead shows up as Direct or Unassigned, the form or scheduling tool is probably losing the source (iframes and redirects are the usual suspects). Fixing that first is worth the time.
8. Look at it monthly. A six-month view tells you what range is normal for your site, so one unusual month doesn’t send anyone into panic.

If you can connect those leads to your CRM, you can take it one step further and see which channel brings pipeline and revenue, not only form fills.

Should you invest in organic or paid search?

In our clients’ data, both channels brought a big share of leads, and on the same kind of page they converted about the same. 

Organic search brought the largest share of lead sessions and met people at every stage, from the first blog post to the pricing page. Paid search brought a concentrated audience straight to product pages.

The way I think about it: organic is the base, and paid adds precision on top. Organic keeps bringing visitors without a cost per click, and a product page that ranks can keep converting like a paid landing for months. Paid lets you show up exactly where demand is ready, and you can turn it up or down in an afternoon.

If I had to pick one next step from this data, it would be to look at the organic product pages: which ones rank, for which queries, and which are missing (comparison pages, integrations, pricing explained clearly). That’s where organic and paid compete on the same terms.

To decide where the next dollar goes, I’d add two numbers to this analysis: what each lead costs in each channel, and how many of those leads become customers. GA4 gives you the first half of the picture. Your CRM gives you the second, and that’s usually where the budget conversation gets interesting.

(If you want to go deeper on how organic builds demand before people even know what to search for, I wrote about it in our post on discoverability.)

FAQ

Does organic or paid search convert better for B2B?

Across all pages, paid search converted better in our data: organic’s rate was about 40% of paid’s at the median site. On product pages they converted at about the same rate (organic at 1.04 times paid’s rate). Most of the difference comes from where each channel sends people.

What percentage of B2B leads come from organic search?

At the median site in our sample, organic search brought 26.1% of lead sessions between March and August 2026, more than paid search (21.0%) or direct (19.1%).

What is a good conversion rate for organic search in B2B?

It depends on the page type and on which event you count. In our sample, the median site turned 0.21% of all organic sessions into a lead session: 0.69% of organic sessions that landed on product pages and 0.10% of those that landed on informational pages. Comparing channels on the same type of page inside your own site tells you more than an external benchmark.

How do I see conversion rate by channel in GA4?

Go to Reports > Acquisition > Traffic acquisition, select your lead event in the Key events column, and look at Session key event rate for each channel. To split by landing page, use a free-form exploration. The step-by-step version is in the section above.

Is direct traffic better than organic for leads?

Direct brought a lot of traffic (about half of all sessions at the median site) and 19.1% of lead sessions. Organic converted 2.3 times as well as direct inside each site. Since part of direct likely comes from people who first found you through search, we recommend looking at both together.

Do AI assistants like ChatGPT send B2B leads?

Yes, still in small numbers. In our sample they brought 0.5% of sessions and 2.0% of lead sessions, converting at about 2.9 times organic’s rate at the median site.