Stop optimising for cost per lead. Optimise for cost per qualified lead.

Cost per lead is the most quoted number in paid media and the least useful. It counts form fills, and form fills are the easiest thing in the funnel to manufacture. Loosen the form, add a discount, buy broader traffic, and cost per lead falls while the sales team quietly stops answering the phone.

The number that survives contact with sales is cost per qualified lead: the cost of an enquiry that meets criteria you wrote down before the campaign launched.

A qualified lead definition needs three parts: who counts (industry, geography, role, job size), what disqualifies (out of area, out of budget, wrong intent), and how it is recorded (a CRM status, not a gut feeling).

Write it with sales in the room. If marketing writes the definition alone, every disagreement about lead quality becomes a disagreement about vocabulary rather than performance.

Google, Meta and TikTok optimise toward the conversions you send them. If you send every form fill, they will find you more form fills, including the worthless ones.

Import the qualified status from your CRM as an offline conversion, and give it a value. Within a few weeks the bidding starts buying the audiences that produce leads sales actually wants, which usually costs more per lead and less per customer.

When accounts switch to qualified-lead optimisation, cost per lead typically rises 20 to 60 percent while qualified volume rises and cost per sale falls. Brief stakeholders on that before you make the change, or the first weekly report will look like a failure.