Marketing Budget Forecaster
Most budgets are set by last year plus ten percent. A better start is the goal: how much revenue you must produce, and the efficiency you can realistically buy it at. Enter the target, choose your method, and watch the budget fall out of the math.
There are two honest ways to size a marketing budget. Top-down: take a marketing-as-a-percent-of-revenue figure and apply it to your goal. Goal-down: divide the revenue target by the blended ROAS you can sustain — budget = revenue ÷ ROAS. This tool does both, then splits the result across top-, middle-, and bottom-of-funnel so the number becomes a plan, not just a total.
Marketing Budget Forecaster inputs and result
| Funnel stage | Budget |
|---|
How to use this calculator
- Start with the revenue goalEnter the revenue you need marketing to produce. The budget should serve the goal, not the other way around — this is what separates a forecast from a guess.
- Pick a sizing methodDivide by a target blended ROAS if you think in efficiency terms, or apply a percent-of-revenue rule if you plan top-down from a board target.
- Read the implied ratioWhichever method you choose, the tool shows the other view: a budget set by ROAS reveals its percent of revenue, and vice versa. Sanity-check both against your margin.
- Split across the funnelSet the top-, middle-, and bottom-of-funnel percentages. Demand-creation businesses tilt up the funnel; demand-capture businesses tilt down.
- Export the planCopy a share link, download the CSV for your model, or print a one-page PDF for the budget meeting.
RGM Expert Says
The number a client walks in with is almost always last year’s budget nudged up or down by mood. We replace that with a goal-down forecast in the first session: what revenue do you owe the board, and what blended return can you actually sustain at that scale? Dividing one by the other gives a budget you can defend line by line, which is worth more in a budget fight than any benchmark.
The percent-of-revenue view is the reality check. When the goal-down budget implies a spend ratio of two percent, the goal is probably under-funded; when it implies twenty-five, either the ROAS assumption is fantasy or the margin cannot carry it. We keep both views on screen on purpose, because the disagreement between them is where the honest conversation lives.
The funnel split is where forecasts usually quietly fail. A business that needs to create demand cannot fund itself entirely on bottom-of-funnel capture, because there is nothing to capture yet. We use the split to make that trade visible before the money is committed, then revisit it quarterly as the brand’s pulling power changes.
How it works
The forecaster runs whichever of two formulas you select, then allocates the result across the funnel by your chosen percentages.
- Revenue target — the revenue marketing must drive in the period.
- Target blended ROAS — revenue per dollar of total marketing spend.
- Marketing % of revenue — the top-down share you reinvest in marketing.
- Funnel splits — how the budget divides across awareness, consideration and capture.
Math is rounded for display; the model uses full-precision values.
A budget is a bet on efficiency — make the bet explicit
The hidden assumption in every budget is the return you expect per dollar. Set the budget by dividing revenue by a blended ROAS and that assumption is on the table where it can be argued. Set it by ‘last year plus ten percent’ and the assumption is buried, which is how budgets drift away from the business.
The percent-of-revenue view travels well because it is comparable across companies and years. Published surveys put company-wide marketing budgets in the high single digits to low teens as a share of revenue, but the spread by industry is enormous — a software business and a heavy-equipment manufacturer have no business sharing a benchmark. Treat the percentage as a starting prior, then adjust for your margin and stage.
Finally, a total is not a plan. The same budget spent entirely on retargeting versus spread across the funnel produces wildly different businesses a year later. Forcing the funnel split at planning time is what turns a forecast into something an operator can actually execute.
How to read your spend ratio
There is no universal right percentage — it depends on margin, stage and whether you create or capture demand. Use these bands as a prior, not a target.
| Marketing % of revenue | Typical profile |
|---|---|
| Under 5% | Lean or mature, demand-led |
| 5% to 12% | Common published range |
| 12% to 20% | High-growth, share-buying |
| Over 20% | Early-stage or land-grab |
What operators say about budgets
Set the budget from the goal and the math you can actually defend, not from last year’s number nudged for sentiment.
What gets measured against a clear objective gets funded sensibly; vague budgets invite both overspend and underspend.