Demand Gen Budget Sizer
Demand-gen planning runs backward from money. You do not start with a lead target; you start with the revenue you must book, then walk up the funnel until you reach the raw lead volume — and the spend that buys it.
To size a demand-gen budget, start at the bottom. Divide the revenue target by average contract value to get deals, then divide up through win rate and each stage conversion to reach the lead count, and multiply by your cost per lead. The output is a defensible budget — and a clear view of which conversion rate, not which channel, is the real constraint on growth.
Demand Gen Budget Sizer inputs and result
| Funnel stage | Volume |
|---|
How to use this calculator
- Set the revenue you must bookEnter the new revenue demand generation has to create. Everything downstream is derived from this single goal.
- Divide by contract value for dealsThe tool divides the revenue target by average contract value to get the number of won deals you need.
- Walk up through your conversion ratesWin rate, MQL-to-SQL, and lead-to-MQL each expand the count as you climb the funnel, ending at the raw lead volume required.
- Apply your cost per leadMultiplying the lead count by cost per lead gives the demand-gen budget — and the tool shows your effective cost per won deal.
- Export and stress-testCopy a share link, export the CSV, or print the PDF, then test how the budget moves when each conversion rate improves.
RGM Expert Says
When a revenue-operations leader asks ‘how much budget do I need,’ the wrong answer is a channel plan and the right answer is arithmetic. We anchor on the booking target, divide by contract value, and walk the funnel up to leads. The number that comes out is rarely what anyone expected, and that surprise is the point — it shows whether the goal is fundable at the current funnel math at all.
The instinct is to attack cost per lead, but the bigger lever is almost always the conversion rates between stages. We have watched a five-point lift in win rate cut required lead volume by a quarter and shave six figures off a budget without touching media efficiency. So before we approve more spend, we ask whether the cheaper win is a better-qualified lead or a tighter sales process.
We also build in the lag. Demand generation pays out over quarters, not weeks, so a budget sized to this period’s bookings under-funds the periods that follow. We treat this sizer’s output as the floor and add headroom for the pipeline that has to exist before revenue can land.
How it works
The sizer chains four divisions from revenue down to leads, then one multiplication out to budget.
- Revenue target — new bookings the budget must produce.
- Average contract value — average revenue per won deal.
- Conversion rates — win rate and each stage-to-stage rate up the funnel.
- Cost per lead — fully-loaded cost to generate one lead.
Math is rounded for display; the model uses full-precision values.
The constraint is usually conversion, not cost per lead
Demand-gen budgets blow up not because leads are expensive but because the funnel leaks. Each stage you climb multiplies the lead requirement: a 20% win rate alone means you need five sales-qualified leads per deal, and the stages above multiply from there. That compounding is why a modest lift in any single conversion rate can move the budget more than a cheaper click ever will.
The second lesson is to plan from booked revenue, not from a lead goal. A team chasing a lead number can hit it and still miss revenue if the leads are unqualified. Sizing from contract value and win rate keeps the whole funnel honest, because every lead is traced to the deal it is supposed to become.
Finally, demand generation has a lag built in. Spend today seeds pipeline that closes over the next quarter or two, so a budget sized only to this period’s target quietly starves the next one. Use this sizer as a floor, then fund the pipeline you will need to exist before revenue can arrive.
Reading cost per deal against contract value
There is no universal cost per lead — what matters is the effective cost per won deal relative to your contract value. These bands are a rough sanity check.
| Cost per deal vs. ACV | Read |
|---|---|
| Under 10% of ACV | Efficient acquisition |
| 10% to 30% of ACV | Workable for most B2B |
| 30% to 60% of ACV | High — pressure-test the funnel |
| Over 60% of ACV | Likely unprofitable as modeled |
What operators say about demand gen
Plan demand generation from the revenue you owe and the funnel math that produces it, not from a vanity lead target.
A repeatable, measured acquisition funnel beats a bigger budget poured into a leaky one every time.