The 95:5 rule in B2B marketing says that at any given moment, roughly 95 per cent of your potential buyers are not in the market to buy. Only about 5 per cent are actively shopping. The heuristic comes from Professor John Dawes of the Ehrenberg-Bass Institute, writing for LinkedIn's B2B Institute in 2021, and once you take it seriously, it quietly rewrites how a B2B budget should be allocated.

This post covers what the rule actually claims, the evidence behind it, what it changes in practice, and its honest limits, because it is a heuristic, not a law of physics, and it gets misused in both directions.

What the 95:5 Rule Actually Claims

Dawes' argument is about buying cycles. B2B purchases are infrequent: companies change banks, agencies, software platforms and equipment suppliers on cycles measured in years. If your average customer buys in your category once every five years, then in any given quarter only a small fraction of the total market is actively buying. The rest have a supplier, a contract, no budget, or no urgent need.

The exact ratio varies by category, and Dawes is explicit that 95 per cent is a deliberately simplified illustration rather than a measured constant. The claim that matters survives any reasonable ratio: the large majority of the buyers who will eventually pay you are not shopping today, and no targeting technology can make them shop sooner.

Why You Can't Convert the 95 Per Cent (and What You Can Do Instead)

Performance channels are built to identify and convert existing intent. Search captures people already looking. Retargeting reaches people already aware. Outreach works the shortlists. All of this is valuable, and all of it competes for the same 5 per cent.

The 95 per cent cannot be converted, but they can be reached, and the mechanism is memory. Dawes argues that advertising works principally by creating and refreshing brand-relevant memories that are retrieved when the buying situation eventually arrives. The Ehrenberg-Bass Institute describes this as mental availability: brands grow by being easy for more category buyers to think of, in more buying situations, before any purchase is on the table.

Those buying situations have a name. Jenni Romaniuk, also at Ehrenberg-Bass, calls them category entry points: the real circumstances that trigger a need. “We just failed an audit”. “Our contract renews in March”. The work is to be the brand attached to those triggers in memory.

The buyer who enters the market three years from now is forming the shortlist today, mostly without knowing it. Bain and Google surveyed 1,208 B2B buyers and found that 90 per cent chose a vendor that was already on their shortlist when the process began. If you are not in memory before the search starts, the search rarely finds you.

What This Changes About Budget Allocation

The practical implication is a deliberate split between demand capture and demand creation, rather than a split inherited from whatever last year's dashboard rewarded.

Binet and Field's analysis of the IPA Effectiveness Databank supports the same conclusion from a different dataset: short-term activation converts existing demand efficiently, but long-term brand building creates the future demand and larger commercial effects, and over-weighting activation erodes growth over time. A related warning applies here: very short-term online metrics systematically flatter capture activity, because capture sits close to the transaction and produces signals quickly.

The decision this should change: write down your split between converting today's demand and building tomorrow's, justify it by your category's buying cycle, and defend it as a strategic choice. Teams that cannot name their split usually discover that nearly all of their spend is capture, living off demand somebody else created, and that twelve to eighteen months later the pipeline thins for no reason anybody can name. If every dollar follows an immediate signal, you have chosen a capture-only strategy without ever deciding to.

The Honest Limits of the Rule

Treating 95:5 as a universal constant is as much a mistake as ignoring it. Three caveats keep it useful. First, the ratio moves with the category: fast-repurchase categories have far more in-market buyers at any moment than ten-year infrastructure decisions. Second, the rule says nothing against capture activity, which remains essential; it argues against capture-only strategies. Third, brand investment is not a licence for unmeasured spending: its effects are real but slow, and they show up in baseline sales, branded search and win rates over quarters, not in last-click dashboards over days. Anyone using 95:5 to justify unaccountable brand budgets is misusing it exactly as badly as anyone using ROAS to zero them out.

Frequently Asked Questions

Where does the 95:5 number come from? From Professor John Dawes at the Ehrenberg-Bass Institute, writing for LinkedIn’s B2B Institute in 2021. Dawes is explicit that 95 per cent is a heuristic chosen to make the idea land, not a measured constant. The asymmetry it describes survives any reasonable ratio.

Does the 95:5 rule mean performance marketing is bad? No. Capture is essential and efficient. The rule warns against funding only capture, because capture harvests a pool it cannot refill.

How long does demand creation take to pay back? Slowly, and that is the point. Brand effects build over quarters rather than weeks, and they show up in baseline sales, branded search and win rates rather than in last-click dashboards. Expect a year or more before the effect is legible, which is exactly why the budget for it has to be protected in advance.

Ready to Make the Split Deliberately?

The 95:5 rule earns its place because it changes a real decision: how you divide investment between the buyers you can convert this quarter and the buyers who will pay you for the next decade. Making that call well, with evidence and a defensible rationale, is the discipline FP Collectiv teaches. Start with B2B Marketing Fundamentals, or go straight at the allocation problem in Advanced B2B Marketing: Media and Measurement.

Sources

• Dawes, J. (2021). Advertising effectiveness and the 95-5 rule: most B2B buyers are not in the market right now. The B2B Institute at LinkedIn, with the Ehrenberg-Bass Institute for Marketing Science.
• Sharp, B. (2010). How Brands Grow: What Marketers Don’t Know. Oxford University Press. Chapter 12, on mental and physical availability.
• Romaniuk, J. (2022). Category Entry Points in a B2B World: Linking Buying Situations to Brand Sales. The B2B Institute at LinkedIn, with the Ehrenberg-Bass Institute.
• Binet, L. and Field, P. (2013). The Long and the Short of It. IPA. On activation versus brand building, and the risks of judging both by short-term measures.
• Sherrard, S., Dave, R. and Parker MacGregor, M. (2022). “What B2Bs Need to Know About Their Buyers”. Harvard Business Review, 20 September 2022. Based on a Bain & Company and Google survey of 1,208 B2B buyers at US companies.