Updated: 4 August 2026 · Digital marketing, Lead generation

"How much should a lead cost me?" is one of the questions I'm asked most, and one of the worst-answered questions online. You'll find articles with tables of average cost per lead by industry, and nearly all of them share the same flaw: they're averages of markets that aren't yours, built on data nobody shows you.

The useful answer isn't in a table. It's in your own numbers, and it takes about ten minutes to work out.

Why "industry average" is useless to you

Two businesses in the same sector can have costs per lead an order of magnitude apart, and both be correct. It depends on:

  • Your average ticket. Someone selling €30,000 projects can pay a hundred times more per contact than someone selling €300 ones.
  • Your margin. High revenue on an 8% margin leaves nothing to spend on acquisition.
  • Your close rate. Closing 1 in 4 contacts makes each lead worth vastly more than closing 1 in 40.
  • Your location and competition. The same ad in central Madrid and in a small town doesn't cost the same, because it isn't competing against the same bidders.
  • Customer lifetime value. If a client stays three years, you're not buying one sale — you're buying three years of revenue.

With five variables moving, any "industry average" is noise. What you can calculate is your ceiling.

The calculation runs backwards from what you earn

The maths goes in the opposite direction from how it's usually done. It doesn't start with what you're willing to spend. It starts with what a client is worth to you.

Step 1 — Work out margin per customer. Take your average ticket and subtract the direct costs of delivering it. If you sell recurring services, multiply by the average number of months a client stays.

Step 2 — Decide what share of that margin goes to acquisition. There's no universal rule, but 10% to 30% is a sensible starting range for a small business. Closer to 10% if referrals already bring you work and you're topping up; closer to 30% if you're growing aggressively and can wait months to recoup.

Step 3 — Apply your close rate. Divide what you can spend per customer by the number of leads it takes to get one. That result is your maximum cost per lead.

In one line:

Maximum CPL = (margin per customer × % allocated to acquisition) × close rate

A worked example

The figures below are illustrative — swap in yours.

An estate agency selling second homes on the coast to international buyers:

  • Average commission per sale: €9,000
  • Direct cost of servicing the sale (viewings, travel, legal coordination, portal fees): €2,500 → margin per client: €6,500
  • Share allocated to acquisition: 15% → up to €975 per closed sale
  • Of every 100 enquiries from abroad, 2 end in a completed purchase → close rate of 2%

Maximum CPL = €975 × 0.02 = €19.50

That's the number that matters. This agency can pay up to about €19.50 per enquiry and stay profitable. If its campaigns deliver leads at €8, there's headroom to invest far more aggressively. If they arrive at €45, it's losing money on every one — even though €45 for a lead on a €9,000 commission feels cheap.

Notice what the close rate does here. Without that step, the agency would think it could pay €975 per lead. That missing multiplication is the single most common error I see in this calculation.

It also explains why qualification pays for itself so quickly in this kind of business: at a 2% close rate, doubling lead quality is worth more than halving lead cost.

When your real cost exceeds your ceiling

A number in the red doesn't mean switching off the campaigns. It means finding which of three levers is jammed:

The campaign. Targeting too broad, keywords with informational rather than commercial intent, ads that attract browsers. I check this first because it's the fastest to fix.

The conversion rate. If your landing page converts at 1% when it could convert at 4%, your cost per lead is four times higher than necessary and the campaign isn't at fault at all. The fix is on the page, not in the budget.

The sales process. If good contacts arrive and few close, the problem sits after the form: response speed, follow-up, or the proposal itself. Raising ad spend in that situation is pouring fuel into a hole.

It's worth knowing which of the three you're in before changing anything — and worth measuring it on cost per customer rather than cost per lead, or you'll optimise toward the wrong target.

What moves the price through the year

Even with a fixed ceiling, what you actually pay moves around. Some variation is normal and not worth panicking over:

  • Seasonality. Some sectors have months where competitors bid far harder. Costs rise without you doing anything wrong.
  • New competition. A well-funded chain entering your area changes the picture within weeks.
  • Campaign learning. New campaigns are almost always more expensive in their first weeks, while the system works out who to show ads to.
  • Landing page and site quality. Platforms reward relevant, fast pages with better costs. A slow website charges you twice: once in conversion, once in bidding.

That last point connects two budgets people rarely look at together: what you spend on advertising and what you spend on your website are communicating vessels. A better landing page lowers cost per lead across every campaign at once.

Frequently asked questions

What percentage of margin should go to acquisition? 10% to 30% is a sensible starting range for a small business, but it depends heavily on whether clients are recurring and how long you can wait to recoup. A business with multi-year clients can justify far higher percentages on the first sale.

I don't know my close rate. What now? It's the most commonly missing number and the easiest to get. Count how many contacts arrived last month and how many bought. Even at small volumes, your own rough figure beats any internet average.

Does the same maths apply to organic leads? The reasoning is identical, but the timing differs: with SEO you invest for months before the first contacts arrive, after which the marginal cost per lead drops sharply. For a sense of that upfront investment, see the 2026 SEO pricing guide.

Should I pay per lead instead of paying for campaign management? Pay-per-lead makes sense when volume is high and the process is well measured, because it shifts some risk. At low volume, or without a measured sales process, it usually costs more than it appears to. I assess it project by project.

How often should I recalculate? At least twice a year, and any time your pricing, cost structure or close rate changes. It's a number that ages.

If you'd like, we can run this calculation on your real numbers and compare the result against what you're paying today. It's the first conversation I have on any lead generation project. Send me your figures.