What is Funnel?

A funnel is a model of the stages buyers move through, from first hearing about a company to becoming a customer, drawn as a shape that narrows because fewer people reach each next stage.

At a glance

• Most B2B funnels have three broad parts: top of funnel (awareness), middle of funnel (consideration) and bottom of funnel (decision).
• The idea goes back to the AIDA model (attention, interest, desire, action), which Oxford Reference dates to 1898 and E. St. Elmo Lewis. A 2023 study by Iwamoto questions how much of it Lewis actually formulated.
• Ad platforms describe similar stages: LinkedIn uses awareness, interest, consideration and conversion; Amazon Ads adds loyalty at the end.
• The useful numbers are the conversion rates between stages, not the count at the top.
• A funnel describes what’s happening. It doesn’t tell you why.

How a B2B funnel works

Each stage is defined by what the buyer has done, not by what you sent them. A typical B2B version runs: visitor, lead, marketing qualified lead, sales qualified lead, opportunity, customer. The CRM records when each record enters a stage, which lets you measure how many move on and how long it takes.

Once stages are defined, the funnel becomes a planning tool. If you know conversion rates and deal size, you can work backward from a revenue target to the number of meetings and leads you need, and see which stage would move the result most if it improved.

Example (illustrative): a team needs 10 new customers a quarter. It closes one in four opportunities, turns half of its held meetings into opportunities, and books a meeting from about one in five qualified leads. That’s 40 opportunities, 80 meetings and 400 qualified leads. Lifting the meeting-to-opportunity rate from 50% to 60% cuts the leads needed by about a sixth.

Where the funnel model falls short

Real B2B buying isn’t a straight line. Several people from one account arrive at different stages, deals stall and restart, and referrals often skip the top entirely. A funnel built on individual leads can show a healthy top while the accounts that matter never move.

The funnel also stops at the sale. That’s why some companies pair it with a flywheel, which treats retained and referring customers as the thing that feeds the next cycle.

Common funnel mistakes

• Celebrating volume at the top. More leads with lower conversion can mean less pipeline, not more.
• Stage definitions nobody agrees on. If marketing and sales define a qualified lead differently, every conversion rate is an argument.
• Measuring people, selling to accounts. Roll stages up to the account when several buyers are involved.
• No owner for the middle. When marketing owns the top and sales owns the bottom, leads stall in between.

How the funnel shows up in a revenue system

The funnel only measures something if the stages, the handoffs and the reports are set up the same way in the CRM for every lead and account. That setup is part of the RevOps work we run inside partners’ systems. See how we run RevOps.