"How much should we spend on demand generation?" is the wrong question. The right one is "what return do we need, and what budget makes that math work?" — and once you frame it that way, the number gets a lot easier to defend.
This guide gives you the benchmarks, the models, and a way to set a budget you can justify to a board. No vague "it depends." Real percentages, a worked calculation, and the mistakes that make B2B teams either underspend into irrelevance or overspend into waste.
Start with the benchmark, then ignore it
The common benchmark: B2B companies spend somewhere between 6% and 14% of revenue on marketing overall, with high-growth firms at the top of that range and established, slower-growth firms at the bottom. Of that marketing budget, a meaningful share — often 40–60% — goes to demand generation specifically, with the rest on brand, content, events, and headcount.
So a £10m-revenue B2B business might spend £600k–£1.4m on marketing, of which perhaps £300k–£700k is demand generation. That's the benchmark. Now ignore it as anything more than a sanity check, because it tells you what the average company does, not what your growth target requires.
The model that actually sets your budget
Work backwards from the pipeline you need. The math is simple and it's the only way to set a number you can defend.
- Start with the revenue target. Say you need £4m of new business next year.
- Apply your win rate to get pipeline needed. If you close 25% of qualified opportunities, you need £16m of pipeline.
- Split it by source. If marketing is responsible for 50% of pipeline, that's £8m of marketing-sourced pipeline.
- Apply your pipeline-to-spend ratio. If every £1 of demand gen spend has historically produced £8 of pipeline, you need £1m of demand generation budget.
That £1m is a number you can put in front of a board, because every step ties to an outcome they care about. The benchmark percentage was a starting sanity check; this model is the actual answer. If you don't yet know your pipeline-to-spend ratio, finding it is the single most valuable measurement exercise you can do.
"A budget set as a percentage of revenue is a guess. A budget worked backwards from a pipeline target is an argument. Boards fund arguments, not guesses."
Splitting the budget: creation vs capture
Once you have the number, the next decision is how to split it. The biggest structural mistake is putting everything into demand capture — search, retargeting, bottom-of-funnel — and nothing into demand creation. That harvests existing demand efficiently and does nothing to grow the market, so capture costs climb every quarter as you fish in the same shrinking pond.
A healthier split for a growing B2B business is roughly 50–60% to capture and 40–50% to creation. Capture pays back this quarter; creation pays back over the next several and makes capture cheaper. Skew too far to capture and you mortgage next year's pipeline for this quarter's leads. We explain the mechanism in why demand generation produces leads, not pipeline .
What changes the right number for you
Several factors move your budget up or down from the benchmark. Be honest about which apply.
- Growth target. Aggressive growth needs front-loaded investment; the budget leads the revenue, not the other way round.
- Deal size. Higher ACV justifies higher cost per opportunity, so high-value B2B can spend more per lead than transactional businesses.
- Sales cycle. Long cycles mean today's spend shows up as revenue in two or three quarters — budget has to account for the lag.
- Brand maturity. An unknown brand needs more creation spend to build preference; an established one converts capture more cheaply.
- Competitive intensity. Crowded categories bid up paid costs and demand more creation to stand out.
The two ways teams get it wrong
Underspending into irrelevance
The more common failure. The budget is set as a cautious percentage, spread thinly across too many channels, and never given enough behind any one to compound. The result is activity without momentum — a bit of everything, not enough of anything. In demand generation, a focused budget on two or three channels beats a thin budget on eight every time.
Overspending without instrumentation
The other failure: pouring money in without measuring pipeline-to-spend, so you can't tell which pounds work. This usually looks like a big paid budget with no creation engine and no attribution, producing leads nobody trusts. More money makes the problem bigger, not better. Before you scale spend, instrument it — our piece on B2B marketing attribution models covers how.
- Work backwards from a revenue target, not forwards from a revenue percentage.
- Find your pipeline-to-spend ratio — it's the number that makes the budget defensible.
- Split roughly 50–60% capture, 40–50% creation; never starve creation.
- Concentrate budget on two or three channels rather than spreading it thin.
- Instrument before you scale — don't pour money into a funnel you can't measure.
A note on agency and headcount costs
Your demand generation budget isn't just media spend — it includes the people running it, whether that's headcount, an agency, or a consultancy. A common error is funding the media generously and the expertise cheaply, then wondering why the media underperforms. Skilled hands on a modest budget beat junior hands on a large one. Budget for the seniority of the people running the programme, not just the spend they're deploying. Our pricing is built around senior partners doing the work directly rather than handing it to juniors.
How to phase it in
If you're starting from a low base, don't jump to the full modelled number overnight. Phase it: establish the measurement, prove the pipeline-to-spend ratio on a focused budget, then scale the channels that demonstrably pay back. A budget that grows in step with proven returns is far easier to defend — and far less likely to be cut at the first quiet quarter — than a big number deployed on faith.
This is where a clear demand generation strategy earns its place: it tells you what to fund first and how to prove it before you scale.
The honest answer
So how much should you spend? Enough to hit your pipeline target at your pipeline-to-spend ratio, split sensibly between creating and capturing demand, concentrated on the channels that work, and run by people senior enough to make it pay. That's a real answer, and it's one you can take to a board.
If you want help building the model for your business — and a senior view on what your budget should actually be — that's exactly what we do. Book a discovery call and we'll work the numbers through with you.