Marketing Budget Calculator

How to think about marketing budget allocation

Most B2B SaaS companies allocate marketing budget based on last quarter's spend plus a percentage increase. It is simple. It is also wrong. It assumes last quarter's channel mix was optimal, which it almost never was.

A better approach starts with the revenue target and works backward. How many deals do you need to close? Given your win rate, how many opportunities does that require? Given your lead-to-opportunity conversion rates by channel, how many leads does each channel need to produce?

This is what the calculator above does. It translates a revenue target into a leads-needed number for each channel, then shows you whether your budget is sufficient to generate those leads at your current cost-per-lead rates.

The numbers that matter most

Cost per lead varies wildly by channel. Content and SEO typically produce the cheapest leads in B2B SaaS, often $80-$150 per lead. LinkedIn ads run $300-$500. Events can exceed $600 per lead when you factor in booth costs, travel, and staff time. But cheap leads are not always good leads.

Lead-to-opportunity rate is the equalizer. A $500 event lead that converts to an opportunity at 25% costs $2,000 per opportunity. A $120 content lead that converts at 8% costs $1,500 per opportunity. The channel that looks expensive on a CPL basis might look efficient on a cost-per-opportunity basis.

Projected revenue is the final answer. Every channel input feeds into the same question: how much revenue does this budget allocation produce? If you can generate $900K in projected revenue from a $150K budget, your marketing ROI is 500%. If you are projecting $600K against a $750K target, you have a gap to close.

Common budget calculation mistakes

Ignoring channel capacity. You cannot spend $100K on content marketing in a quarter and expect proportional results. Each channel has a capacity curve. Paid search scales linearly up to a point, then CPCs increase. Content compounds over time but does not produce instant results. Events are constrained by conference schedules.

Using company-wide win rates per channel. Enterprise deals from events close at different rates than SMB deals from paid search. If your calculator uses one win rate for all channels, it overestimates revenue from some channels and underestimates others.

Excluding sales cycle time. A lead generated in January might not close until May. If you are building a Q1 budget against a Q1 target, most of your Q1 leads will not contribute to Q1 revenue. Budget planning and revenue planning operate on different timelines. Account for it.

Static allocation. Setting your budget in January and not adjusting until April is three months of potentially wasted spend. The best marketing teams review channel performance monthly and shift budget toward what is working. This calculator shows a starting allocation. Reality should be more dynamic.

When a calculator is not enough

This tool gives you a starting framework for budget allocation. It answers the basic question: given my funnel metrics, is this budget sufficient to hit my revenue target?

What it cannot do is tell you the optimal allocation. It cannot account for multi-touch attribution, channel interaction effects, or diminishing returns at scale. For that, you need marketing mix models built on your actual campaign data.

ORM builds those models for B2B SaaS companies. Not dashboards that show what happened. Prescriptive models that recommend where to shift budget next quarter and quantify the expected revenue impact.