Customer Lifetime Value: Formula, Calculator & How to Increase It
LTV is one of the most cited metrics in ecommerce — and one of the most misused. Here's how to calculate it properly, why projected LTV is dangerous for cash flow, and the levers that actually increase it.
Jakob Sperber
Director
Finance
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Customer lifetime value (LTV) is one of the most cited metrics in ecommerce — and one of the most misused. The concept is sound: a customer is worth more than their first order. The problem is how brands use it to justify unsustainable acquisition costs.
The LTV Formula
LTV = Average Order Value × Purchase Frequency × Customer Lifespan
Example: $80 AOV × 2.5 purchases/year × 3 years = $600 LTV.
Alternative: LTV = Average Revenue Per Customer Per Year × Average Customer Lifespan.
Both are estimates. Neither is cash in the bank.
LTV vs CLV
Same thing, different acronyms. LTV (Lifetime Value) and CLV (Customer Lifetime Value) are used interchangeably. Don't overthink the naming.
The Problem With Projected LTV
Traditional LTV projects revenue 12–24 months out based on historical cohorts. Three problems:
It's revenue, not profit. A $600 LTV with 55% CM2 = $330 in actual margin. Citing $600 to justify a $200 CAC sounds reasonable until you do the maths.
It's projected, not realised. Customers churn. Behaviour changes. The LTV from 2023 cohorts may not materialise for 2026 customers.
It ignores time value of money. You pay CAC on day one. LTV trickles back over years. If you're funding growth from cash flow, this timing gap can kill you.
Why 60-Day LTGP Is Better
60-day LTGP = Total gross profit from a customer within 60 days of first purchase.
It uses actual data (not projections), measures profit (not revenue), and aligns with your cash conversion cycle. For the full breakdown, see our LTV vs 60-day LTGP guide.
Use 60-day LTGP for CAC targets and cash flow planning. Use projected LTV for strategic planning and investor conversations only.
LTV:CAC Ratio
The classic "3:1 is healthy" rule. Useful but incomplete without payback period. A 3:1 ratio with 30-day payback is a machine. A 3:1 ratio with 180-day payback might bankrupt you before you see the return.
Always pair LTV:CAC with CAC payback period.
How to Increase LTV
1. Increase Repeat Purchase Rate
The biggest lever. Every percentage point improvement in repeat purchase rate compounds into LTV at near-zero marginal cost.
2. Subscription/Auto-Replenishment
Locks in recurring revenue. 10–15% discount on subscribe-and-save is cheaper than reacquiring the customer through ads.
3. Cross-Sell and Upsell
Post-purchase upsells, email cross-sell flows, product line expansion. See our upsell vs cross-sell guide.
4. Improve Product Quality
If the product doesn't deliver, nothing else matters. Quality is the foundation of repeat behaviour.
5. Post-Purchase Experience
Fast shipping, quality packaging, proactive communication, easy returns. The experience between orders determines whether there's a next order.
6. Loyalty Programs
Points, tiers, referral rewards. Front-load incentives on the second purchase — that's the hardest gap to close.
Segment LTV
Not all customers are equal. Segment by:
Acquisition channel: Meta customers may have different LTV than Google customers.
First product purchased: Some entry products predict higher retention. Promote those as your lead offers.
Geography: Metro vs regional may show different repeat behaviour.
When LTV Matters vs When It Doesn't
Matters: Long-term strategic planning, retention investment decisions, investor conversations, comparing customer segments.
Doesn't matter: Daily CAC targets (use 60-day LTGP), cash flow planning (use actual CAC and payback period), scaling decisions (use marginal data, not averages).
The Bottom Line
LTV tells you what a customer might be worth someday. 60-day LTGP tells you what they're actually worth right now. One is a forecast. The other is a bank statement. Build your growth model on the bank statement. Use LTV for strategy, not operations.
