The five numbers that determine lead generation ROI
Lead generation ROI is determined by five numbers: cost per lead (CPL), cost per qualified lead (CPQL), cost per customer acquisition (CAC), customer lifetime value (LTV), and LTV:CAC ratio. Tracking all five tells you whether your lead generation investment is profitable. Tracking only CPL which most businesses do is misleading because a low CPL with low qualification still produces a high CAC.
Number 1: Cost per lead (CPL)
Formula: Total monthly lead generation spend total leads generated
What it tells you: How much each contact costs to acquire. This is the most commonly tracked metric and the most misleading in isolation. A ?80 CPL from Meta Ads looks great until you discover that only 5% of those leads qualify.
Benchmark range (Mumbai): ?50 ?2,000 depending on channel and industry.
Number 2: Cost per qualified lead (CPQL)
Formula: Total monthly spend qualified leads (leads that pass BANT qualification)
What it tells you: How much each sales-ready prospect costs. This is the metric that connects marketing spend to sales pipeline.
Example: ?25,000 monthly Google Ads spend ? 50 leads ? 12 qualified leads = ?2,083 CPQL. This number tells you the real cost of a sales conversation far more useful than the ?500 CPL.
Number 3: Cost per customer acquisition (CAC)
Formula: Total monthly spend (ads + tools + agency) new customers acquired
What it tells you: How much each paying customer costs to win. This is the ultimate efficiency metric for lead generation.
Example: ?40,000 total monthly spend ? 3 new customers = ?13,333 CAC. If your average deal value is ?1,00,000, you are spending ?13,333 to earn ?1,00,000 a healthy 7.5:1 return.
Number 4: Customer lifetime value (LTV)
Formula: Average deal value average number of purchases per customer average customer lifespan
What it tells you: The total revenue a customer generates over their entire relationship with your business.
Example for a Mumbai coaching institute: ?40,000 average course fee 2.5 courses per student 1 (one-time relationship) = ?1,00,000 LTV.
Example for a CRM automation agency: ?1,50,000 setup fee + ?15,000/month retainer 18 months = ?4,20,000 LTV.
Number 5: LTV:CAC ratio
Formula: LTV CAC
What it tells you: Whether your lead generation is profitable and by how much.
| LTV:CAC ratio | What it means |
|---|---|
| Below 1:1 | You are losing money on every customer acquired |
| 1:1 to 2:1 | Barely profitable, unsustainable at scale |
| 3:1 to 5:1 | Healthy, profitable, worth scaling |
| Above 5:1 | Very profitable consider increasing spend to accelerate growth |
The target for most Mumbai SMBs: 3:1 or higher. Below 3:1, investigate whether CPL is too high, qualification rate is too low, close rate needs improvement, or deal value needs to increase.
How to improve each number
Improve CPL: Better ad targeting, better landing pages, better keywords, more negative keywords.
Frequently asked questions
CAC and LTV because their ratio tells you immediately whether lead generation is profitable. Add CPL and CPQL tracking to diagnose where inefficiency exists.
Estimate conservatively based on your first 10 20 customers. Use average deal value expected repeat purchases. Update the estimate every 6 months as real data accumulates.
Diagnose which variable is the problem. High CPL ? improve targeting and landing pages. Low qualification rate ? improve qualification questions and criteria. Low close rate ? improve sales process and follow-up. Low LTV ? explore upsell, retainer, and recurring revenue opportunities.