What is Customer Lifetime Value (LTV)?
Customer lifetime value is the total net revenue a single customer is expected to generate throughout their entire relationship with your business. It is the metric that connects acquisition costs to long-term profitability — if you know your LTV, you know how much you can afford to spend to acquire a customer while remaining profitable.
How to calculate LTV
There are several approaches, from simple to advanced:
Simple LTV: LTV = Average Order Value x Purchase Frequency x Customer Lifespan
For example, if your AOV is $75, customers buy 4 times per year, and the average customer stays active for 3 years: LTV = $75 x 4 x 3 = $900.
Contribution-margin LTV: LTV = (AOV x Purchase Frequency x Customer Lifespan) x Gross Margin %
This version is more useful because it accounts for the cost of goods sold, giving you a profit-based LTV rather than a revenue-based one.
For SaaS businesses, LTV is often calculated as: LTV = Average Monthly Revenue Per Customer / Monthly Churn Rate
Why it matters for eCommerce and SaaS
LTV determines the ceiling on your customer acquisition cost (CAC). If your LTV is $900 and your CAC is $200, you have a healthy 4.5x LTV:CAC ratio. If your LTV is $150, that same CAC makes acquisition unprofitable.
This has direct implications for CRO. Improving conversion rate lowers CAC by spreading acquisition costs across more converters. But improving LTV — through repeat purchases, upsells, and retention — amplifies the return on every conversion. The two efforts are complementary.
For SaaS, LTV is especially critical because the business model depends on customers staying long enough to recoup the cost of acquisition. A high churn rate compresses LTV regardless of how many customers you acquire.
How to increase LTV
- Improve retention — Email sequences, loyalty programs, and personalized recommendations keep customers coming back.
- Increase purchase frequency — Subscription models, replenishment reminders, and re-engagement campaigns drive repeat orders.
- Increase AOV — Upselling and cross-selling raise the value of each transaction.
- Enhance the post-purchase experience — Packaging, shipping speed, and customer support quality influence whether a first-time buyer becomes a repeat customer.
Industry benchmarks
LTV:CAC ratios of 3:1 or higher are generally considered healthy for both eCommerce and SaaS. Ratios below 2:1 typically indicate either an acquisition cost problem or a retention problem — and the solution depends on which side of the ratio is off.
How acceleroi approaches it
At acceleroi, we incorporate LTV into our optimization framework because short-term conversion gains that attract low-quality customers can actually reduce LTV. During a CRO audit, we segment customers by acquisition source and behavior to identify which conversion funnel paths produce the highest-LTV customers. This ensures our A/B tests optimize for long-term revenue, not just immediate transactions.
Related resources
- Get a free CRO audit to understand how your conversion funnel impacts customer lifetime value
- Read our blog for strategies on increasing LTV through CRO