What does a lead cost you? If you do not know, you are spending blind

Monthly ad spend divided by the leads that arrived. That is all it is.

And yet the commonest answer we get to “what does a lead cost you” is an order of magnitude quoted from memory, or a silence. Not because the sum is hard: because the second number does not exist.

Why the second number does not exist

Leads arrive from six places: the website form, the phone, WhatsApp, direct email, word of mouth, and the person who walks into the shop. The form gets counted. The other five do not.

The result: you divide the spend by a number smaller than the real one, and the cost per lead looks enormous. Or you count every contact — including the ones who would have come anyway — and it looks tiny. Neither figure helps you decide anything.

The minimum you need before spending

You do not need a complicated analytics setup. You need three things:

• One place where every lead lands. A spreadsheet will do, as long as all of them land in it, with the date and the stated source (“how did you find us?”).
• Call tracking. A different number in the campaigns, or simply the question on the phone. It is the source that almost always weighs most and that almost nobody measures.
• Events defined around your sales process, not the standard one. “Filled in the form” is not a conversion if half of those people never answer the phone: the conversion is “answered and we booked something”.

What changes once you have the number

What changes is that you stop arguing about opinions. With cost per lead in hand, every choice becomes a question with an answer: that campaign costs twice the other one for the same leads, so it gets switched off or changed.

And above all the direction of the reasoning changes. The question stops being “how much do I spend on advertising” and becomes “how much am I willing to pay for a lead” — which is a question you can answer, because you know what a client is worth.

The arithmetic nobody does

If you spend €1,500 a month and 24 leads arrive, each one costs €62.50. Take 30% off the cost per lead and the same €1,500 buys 34 instead of 24. Ten more leads, without spending another euro.

How much cost can genuinely be taken out, nobody knows before measuring. But the sum showing what it would be worth can be done today, and it explains why tracking comes before spending rather than after.