Software Growth

Sales funnel

A sales funnel maps the stages a prospect passes through from first awareness to paying customer, narrowing at each step as people drop out.

A sales funnel is a model of the buyer's path from first hearing about you to becoming a customer. It is wide at the top, where many people show some interest, and narrow at the bottom, where only a few sign. For a founder it is a way to find where prospects are lost, so you fix the stage with the biggest leak first.

The stages

Names differ between companies, but a typical B2B SaaS funnel looks like this:

  1. Visitor. Someone lands on your site or content.
  2. Lead. They give you an email address or sign up for a trial.
  3. Marketing qualified lead. They fit your target customer and show interest.
  4. Sales qualified lead. Sales confirms there is a real opportunity.
  5. Opportunity or proposal. A demo has happened and a price is on the table.
  6. Customer. They pay.

HubSpot describes the funnel as a large pool of prospects that narrows through qualification, nurturing and conversion, with probability of closing rising as prospects move deeper and learn more about the product.

How to calculate funnel conversion

Example: 10,000 visitors a month. 300 become leads (3%), 90 become MQLs (30% of leads), 30 become SQLs (33%), and 9 become customers (30%). The overall rate is 9 / 10,000 = 0.09%. If the average customer pays $1,500 per year, the funnel produces $13,500 of new annual revenue per month.

Now you can test changes. Lifting MQL-to-SQL from 33% to 40% raises SQLs to 36 and customers to 10.8, about $16,200. Compare that to doubling traffic, which also doubles output but usually costs more. Fixing the weakest stage is often cheaper than adding top-of-funnel volume.

Common mistakes

  • Treating it as linear. HubSpot notes that buyers often research extensively before talking to sales and can leave and return unpredictably. Use the funnel to measure, not to describe every buyer.
  • Stopping at the sale. The funnel ends at signup, but revenue comes from retention and expansion. HubSpot's alternative is the flywheel, where happy customers feed new demand.
  • Inconsistent stage definitions. If "lead" means different things to different people, your rates are meaningless.
  • Averaging different paths. Self-serve signups and demo-booked leads convert differently. Build one funnel for each.

Funnel versus pipeline

People use the words loosely. A funnel is the whole journey, including anonymous visitors and early leads. A pipeline usually means the open deals your sales team is working. Pipeline coverage and sales velocity are about the bottom of the funnel.

For small SaaS

Keep it to four or five stages, put numbers on each, and review monthly. For a self-serve product, the funnel is visitor, signup, activated, paying. Compare conversion between stages, find the weakest, and spend your next month there.

Sources

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