Cheap leads are often the expensive ones
Cost per lead is the metric agencies report because it is easy to improve — broaden the targeting, weaken the qualification, and it falls. What matters is cost per customer, and that depends on how many of those leads your sales process can actually close.
A ₹200 lead that closes at 5% costs ₹4,000 per customer. A ₹600 lead that closes at 30% costs ₹2,000. The expensive lead is half the price.
The formulas
Customers = Leads × ( close rate / 100 )
CAC = Spend ÷ Customers
Return = ( Customers × customer value ) ÷ Spend
Worked example
₹60,000 spend, 150 leads, 20% close, ₹12,000 value
- Cost per lead
- ₹400.00
- Customers won
- 30
- Cost per customer
- ₹2,000
- Revenue generated
- ₹3,60,000
- Return on spend
- 6.00×
Where lead quality actually comes from
- Ask one qualifying question in the form. Budget, timeline or company size removes most of the noise at the cost of a slightly higher CPL.
- Match the offer to intent. A free guide produces cheap leads that are early in the cycle; a pricing enquiry produces expensive leads that are ready.
- Respond faster. Contact within the first hour changes close rates more than almost any targeting change.
- Track the close rate by source. Two channels with identical CPL routinely differ by three times on close rate.
When CAC above customer value is still fine
If customers buy repeatedly, first-purchase value understates what they are worth. Paying ₹2,000 to win a customer who spends ₹12,000 a year for three years is a good trade even though the first order was smaller than the acquisition cost.
Use lifetime value in the customer-value field if you have it — but use a figure you have actually measured, not a hopeful one.
Frequently asked questions
What is a good cost per lead?
There is no universal figure. Judge it against your close rate and customer value: a lead is worth up to its close probability times customer value.
What is the difference between CPL and CAC?
CPL is spend divided by leads. CAC is spend divided by customers won. CAC is the one that decides profitability.
Should I use lifetime value or first-order value?
Lifetime value, if you have measured it. Using an unmeasured estimate is how businesses justify overspending.