What it means
A lead is a possibility, not a promise. It might be a form filled in on your website, a business card collected at a trade show, or a name passed on by an existing client, and at that point all you really know is that a door is slightly open.
Leads matter because they are the raw material of revenue, and every later number depends on how many arrive and how good they are. If your close rate and average deal size are stable, then lead volume is the main lever you can pull to change next quarter's sales, which is why marketing budgets are so often judged on cost per lead.
In practice leads are sorted rather than treated equally. A marketing qualified lead has behaved in a way that suggests genuine interest, such as requesting a demonstration, while a sales qualified lead has been spoken to and confirmed to have a need, a budget and a timeline.
Moving a lead between these stages is what qualification means. The most useful discipline is measuring the whole chain rather than the first step.
Cost per lead tells you very little on its own, because a channel producing cheap leads that never convert is more expensive than one producing costly leads that close. What you actually want is the cost of acquiring a customer and the value that customer brings.
Speed and follow-up matter more than most teams assume. Response times measured in minutes rather than days materially improve conversion for inbound enquiries, and a large share of leads that eventually buy do so only after several contacts.
Leads that are never followed up are simply money the business has already spent and then discarded.
In practice
Real-world examples.
Example
A commercial cleaning firm sponsors a facilities management conference and collects 240 badge scans. Only 60 of those contacts answer a follow-up call, and 9 eventually request a quote, which tells the owner that the event costs about $780 per genuine opportunity.
Example
A dental equipment supplier publishes a sterilisation compliance checklist behind a short form. Practices that download it are treated as leads, and because the topic signals an immediate operational concern, roughly one in five agrees to a product conversation within a month.
Example
An architecture practice receives most of its leads through referrals from three contractors. It formalises this by tracking each referral as a lead in a simple spreadsheet, and discovers that referred leads convert at 40% against 6% for website enquiries, which redirects its business development time entirely.
Formula
Calculation
Cost per lead = marketing spend / number of leads. Customer acquisition cost = marketing spend / customers won.
A business software company spends $60,000 on a quarterly campaign and generates 1,500 leads, so cost per lead is $60,000 / 1,500 = $40. Of those, 12% are qualified by the sales team: 1,500 x 0.12 = 180 qualified leads. The team closes 25% of qualified leads: 180 x 0.25 = 45 new customers. Customer acquisition cost is therefore $60,000 / 45 = $1,333.33 per customer. With an average first-year contract value of $4,000, the campaign produces 45 x $4,000 = $180,000 of revenue, a return of $180,000 / $60,000 = 3.0 times the spend.Case study
Seen in the real world.
Northgate Fielding is a fictional company invented for this illustrative case study. It sold workflow software to accountancy firms and had been buying leads from a list broker at $18 each, delighted with the low cost per lead compared with its content marketing at $95 each.
When the finance manager traced the two sources through to signed contracts, the picture inverted. The $18 leads converted to customers at 0.3%, giving an acquisition cost of $6,000 per customer, while the content leads converted at 9%, giving an acquisition cost of about $1,056. The cheap channel was consuming most of the sales team's calling time and producing barely a fifth of the revenue.
In this illustrative example, Northgate Fielding cut the list purchases entirely and moved the budget into the content that was already working. Total lead volume fell by more than half, which alarmed the marketing team, but the number of new customers rose in the following quarter because the sales team was finally spending its hours on prospects who wanted to talk.
Watch out
Common mistakes.
- Judging a marketing channel on cost per lead alone. A channel with cheap leads and a poor conversion rate can cost far more per customer than an expensive one that converts well.
- Treating every enquiry as a lead worth pursuing, which floods the sales team with names that have no budget, no need and no authority to buy.
- Letting leads go cold. Enquiries that are contacted within the hour convert far better than the same enquiries contacted three days later, and most businesses give up after one or two attempts.
Questions
People also ask.
What is the difference between a lead and a prospect?
A lead has shown some interest, while a prospect has been qualified and confirmed to have a genuine need and the ability to buy.
How many leads does a business need?
Work backwards from the revenue target: divide it by average deal size to get customers needed, then divide by your close rate and qualification rate to get the lead volume.
Should marketing or sales own lead qualification?
Both, in stages, with marketing scoring behaviour to decide who gets passed across and sales confirming need, budget and timing in the first conversation.
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