In this article
Define spend, leads, customers and the boundaries
Spend: the media cost — ad clicks, the portal subscription, the exhibition stand — plus the cost of producing and running it: the agency fee or the share of the marketer’s salary, the landing page, the creative. Media only is the common shortcut and it understates every channel by a third or more; decide once, and use the same rule for every channel. Leads: an enquiry from a person who could be a customer — not spam, not a job-seeker, not a supplier — and, more usefully, the subset that qualified against your written standard. Count both; the qualified count is the one that predicts customers. Customers: a first order or a signed engagement, dated, with the channel that first brought the enquiry recorded.
Boundaries: the period — a month is usual — and the lag. A customer won in June from an enquiry in March belongs to March’s spend. If the sales cycle is long, compare spend to customers won from enquiries in that period, which means waiting, or use qualified leads as the interim measure.
Calculate per channel, then blended
Per channel: Google spend divided by Google leads; Google spend divided by customers who first enquired through Google. The same for Meta, the portal, the exhibition, referrals (which have a cost too — the referral fee, the gift, the time), and the website’s organic enquiries (whose cost is the SEO and content spend). This needs every enquiry recorded with its source — call tracking, a form field, a question asked on the phone — which is the part most SMEs are missing, and the reason their per-channel numbers are guesses.
Blended: all marketing spend divided by all leads, and by all customers. The blended customer acquisition cost is the number to compare with what a customer is worth over a year or three — their first-year contribution, or lifetime value if you can estimate it. If blended CAC is a third of first-year contribution, the marketing is paying; if it is equal, it is not; and the per-channel numbers tell you which channel to move money from.
Interpret cheap leads, poor conversion and payback
The most common finding: the channel with the lowest cost per lead has the highest cost per customer, because its leads do not qualify. A portal that sells enquiries cheaply, a Meta campaign judged on form fills, a “free consultation” offer — all produce volume that never converts, and the report that stops at cost per lead calls them successes. Always read the two numbers together, and add the qualification rate between them: leads, qualified leads, customers, and the cost at each step.
Poor conversion between qualified lead and customer is usually not a marketing problem; it is response time, follow-up or the proposal, and the fix is in sales. Payback is the last lens: a channel with a high CAC that brings customers who stay for years can be worth more than a cheap channel that brings one-off buyers. Compare CAC to what the customer pays back over the period you can afford to wait — a business short of cash needs fast payback; one with reserves can buy customers who pay back over two years.
Set it up so the numbers arrive monthly
One sheet, or one report in the CRM, with a row per channel and columns for spend, leads, qualified leads, customers, cost per lead, cost per qualified lead, CAC, and first-year contribution per customer. Fed by: the ad platforms and invoices for spend; the CRM for leads and their source, qualification and outcome; the accounts for contribution. Reviewed monthly, with the decision written down: which channel gets more, which gets less, what changes in the offer or the response.
Owner responsibilities: someone tags every enquiry with its source, someone records qualification and outcome, someone fills the sheet. Twenty minutes a month once the tagging is a habit; impossible if it is not.
Calculator · use it here or print it
Cost per lead and customer acquisition cost
Enter one channel’s numbers for a period, or the blended numbers for all marketing. The outputs tell you whether cheap leads are cheap customers.
Include it; leaving it out is how CAC looks better than it is.
Attribute to the period the lead arrived, even if the sale closed later.
- Cost per lead
- ₹1,750
- Cost per qualified lead
- ₹4,667
- Customer acquisition cost
- ₹23,333
- Lead to customer
- 7.5%
- Months to recover the acquisition cost
- 4.7 months
- Over twelve months means the channel is financed by the customers you already have.
- Lifetime margin to acquisition cost
- 6.4×
- Below 3× the channel is fragile; a small drop in conversion makes it loss-making.
Run it per channel and compare: the channel with the cheapest leads is often the one with the worst customer acquisition cost.
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Mistakes, and what the numbers are for
The mistakes: counting media only; counting every form fill as a lead; attributing customers to the last click when the first enquiry came from search months earlier; comparing channels on cost per lead alone; forgetting that referrals and organic have costs too; and calculating once, in a crisis, rather than monthly. A safeguard: if a channel’s cost per lead is a fraction of the others’, check its qualification rate before celebrating.
The numbers exist to make one decision a month: where the next rupee goes. That is what our performance reporting is built around — the source tagging in your CRM, the spend rules, the monthly sheet by channel with CAC beside contribution, and the reallocation decision it supports — and the free audit will tell you, from your existing data, whether the numbers you have are the numbers that matter.
Questions owners ask
What is a good cost per lead?
There is no general number; it depends entirely on what a customer is worth in your trade. A good cost per lead is one that, after your qualification and conversion rates, produces a CAC well under first-year contribution.
Should salaries be included in spend?
The share of the marketer’s or agency’s time spent on the channel, yes. Excluding it flatters every channel and makes in-house effort look free. Use the same rule everywhere so channels stay comparable.
How do we attribute a customer who came through several channels?
For an SME, the channel that produced the first enquiry is the simplest honest rule. Note the others in the record. Multi-touch attribution models are for far larger budgets.
What if our sales cycle is six months?
Use qualified leads as the monthly measure and CAC as a quarterly one, matching customers to the period their enquiry arrived. Waiting is more honest than guessing.
Do referrals have an acquisition cost?
Yes: the referral fee or gift, the time spent on relationships, the programme if you run one. Usually low, which is why referral CAC is the benchmark the paid channels are judged against.
What does GullySales set up?
The source tagging in your CRM and call tracking, the spend rules, the monthly report by channel from leads to customers to CAC against contribution, and the review that decides where money moves. Scoped in the free audit and priced in writing.