LTV (Lifetime Value)

metrics

Quick Definition

LTV is the total revenue a customer generates over their entire relationship with your company. Formula: Average Revenue Per Customer × Average Customer Lifespan (or ARPU × (1/Churn Rate)).

Detailed Explanation

Lifetime Value predicts how much money one customer will make you before they churn (cancel). Two calculation methods: (1) Simple: If customers pay ₹1,000/month and stay 24 months on average, LTV = ₹24,000. (2) Advanced: ARPU × Gross Margin × (1/Monthly Churn Rate). Example: ₹1,000 ARPU, 80% margin, 5% monthly churn → LTV = ₹1,000 × 0.8 × (1/0.05) = ₹1,000 × 0.8 × 20 = ₹16,000. LTV must be compared with CAC. The golden ratio: LTV ÷ CAC ≥ 3. If LTV is ₹30K and CAC is ₹10K, ratio is 3:1 (healthy). Below 3:1 means you're spending too much to acquire customers. Above 10:1 means you're under-investing in growth (could spend more on marketing profitably). Improve LTV through: upselling (higher plans), cross-selling (add-ons), reducing churn (better retention), increasing pricing, longer contract commitments (annual vs monthly). Track LTV by cohort—customers acquired in Jan 2024 may have different LTV than Dec 2024 customers.

Formula

LTV = ARPU × (1 / Churn Rate) OR Average Revenue Per Customer × Average Customer Lifespan

Real-World Examples

Netflix

ARPU ₹649/month, 3.5% monthly churn → stays ~28 months → LTV = ₹18,172. CAC ~₹500 (mostly organic) → LTV:CAC ratio of 36:1. Massively profitable.

B2B SaaS

₹2,000/month plan, customers stay 18 months average → LTV = ₹36,000. CAC is ₹12,000 → 3:1 ratio. Healthy but could improve retention to boost LTV.

Failed Example

LTV was ₹8K but CAC was ₹12K. Negative unit economics. Couldn't raise funding. Shut down despite having customers.

Why It Matters for Your Startup

LTV tells you maximum you can afford to spend on customer acquisition. If LTV is ₹30K, you can profitably spend up to ₹10K on CAC (3:1 ratio). Higher LTV = more aggressive marketing spend possible = faster growth. Investors care deeply about LTV:CAC ratio.

Common Mistakes

❌Calculating LTV based on first month, not full lifetime (massive underestimation)
❌Not accounting for churn when calculating LTV (overestimation)
❌Ignoring gross margin in LTV calculation (revenue ≠ profit)
❌Using average LTV across all customers (segment by plan, acquisition channel)
❌Not tracking LTV by cohort (early customers often have different behavior)

Frequently Asked Questions

What is a good LTV:CAC ratio?

3:1 or higher. Below 3:1 is unprofitable (spending too much on acquisition). Above 10:1 means under-investing in growth (could spend more on marketing).

How long should I wait to calculate LTV?

Need at least 12 months of data. Better: 24+ months for accurate churn rate. Early-stage can estimate but mark as "projected LTV" not actual.

Can LTV change over time?

Yes! Improves with: lower churn, upsells, price increases. Worsens with: increased competition, worse product-market fit, poor customer success.

Ready to Find Your Startup Idea?

StartupIdeasDB has 3,000+ validated problems to help you build the next big thing.

Browse Problems →