Only about 5% of your buyers are in-market right now. The other 95% will buy later — from whoever they already remember. Those are two different jobs, and they need two different budgets and two different yardsticks.
The 95-5 rule is one of the most useful ideas in B2B marketing and one of the easiest to misuse. It says that at any given moment, only about 5% of the potential buyers in your category are actively in the market to purchase. The other 95% will buy eventually. Just not this quarter.
The idea comes from Professor John Dawes of the Ehrenberg-Bass Institute, in research published with the LinkedIn B2B Institute. It is worth understanding where the number comes from, because once you see the logic you can calculate a version that fits your own market rather than borrowing someone else’s.
Where the 5% comes from
The reasoning is refreshingly simple. Businesses change their providers of services like banking, legal advice, software or telecoms roughly once every five years. If a buyer only switches every five years, then in any given year about a fifth of them — 20% — are in the market. Spread that across four quarters and you get about 5% in any given quarter.
That also means the 5% is not a law of physics. It is an estimate built on an assumed purchase cycle, and your cycle may be different. You can work out your own:
| If customers replace or renew every… | In-market per year | In-market per quarter |
|---|---|---|
| 3 years | ~33% | ~8% |
| 5 years | ~20% | ~5% |
| 7 years | ~14% | ~3.5% |
Whatever your exact figure, the shape of the conclusion does not change. The large majority of the people you will eventually sell to are not shopping today.
Why this reorganises a budget
Once you accept that ratio, it becomes obvious that you are doing two different jobs, and they have almost nothing in common.
Capturing the 5%. These buyers are actively looking. They search for your category, compare vendors and fill in forms. Winning them is about being findable at high intent and being fast when they raise their hand. Tight search campaigns, clear comparison content, and a response process measured in minutes rather than days. This is where speed-to-lead earns its keep.
Being remembered by the 95%. These buyers are not looking. No amount of conversion-focused advertising will make them buy this quarter, because they have no need this quarter. The job here is to be the brand they already recognise and think well of when the need finally arrives. The Ehrenberg-Bass Institute calls this mental availability: the likelihood that your brand comes to mind in a buying situation.
Les Binet and Peter Field’s research for the B2B Institute, The 5 Principles of Growth in B2B Marketing, pointed in the same direction: B2B brands grow best with roughly an even split between long-term brand building and short-term sales activation, rather than pouring almost everything into activation.
The three expensive mistakes
- Spending conversion budget on the 95%. Retargeting everybody who ever visited with “book a demo” ads, or pushing bottom-of-funnel offers at cold audiences. It feels aggressive and growth-minded. It is actually waste wearing a growth costume — paying repeatedly to ask people to buy something they have no current need for.
- Judging brand work by cost per lead. Advertising aimed at the 95% will not produce leads this quarter. Measure it by lead cost and it will always lose the budget argument, not because it failed but because the comparison is rigged.
- Switching brand work off because last-click attribution cannot see it. Last-click credits whatever happened immediately before a conversion. The work that made someone remember you two years earlier never shows up there. Turn it off and the effect shows up later, as slowly declining search volume and harder deals, long after anyone connects the two.
How to measure work aimed at the 95%
This is the honest difficulty: brand effects are slower and noisier to measure than lead volume. That does not make them unmeasurable. Useful signals include:
- Branded search volume over time — are more people searching for you by name?
- Direct and returning traffic from your target market.
- Self-reported attribution — a simple “how did you first hear about us?” field on forms and in first calls often reveals channels that tracking cannot see.
- Reach and frequency within target accounts, rather than clicks.
- Win rate and cycle length on deals where the buyer knew you before they entered the market, compared with deals where they did not.
None of these is as tidy as a cost per lead. They are, however, measuring the right thing.
Putting it to work
- Split the budget explicitly. Decide what share is for capturing the 5% and what share is for the 95%. Write it down. The exact ratio matters less than making it a conscious decision rather than a drift.
- Give each half its own goal. Pipeline and response time for capture. Reach, recall and branded demand for the 95%.
- Report them separately. Different cadence, different metrics, different expectations. Weekly for capture. Quarterly or longer for the 95%.
- Match the message to the moment. The 95% need to understand the problem and remember your name. The 5% need proof, clarity and a fast response. Schwartz’s stages of awareness is the tool for making that distinction precise.
Where to go next
The four layers of ad waste covers what happens when conversion budget is spent in the wrong place. The Three Voices is about what to say to the 95% that is actually worth remembering. And optimise on revenue, not activity explains why capture spend should be judged on pipeline rather than lead volume.